diff --git a/CLAUDE.md b/CLAUDE.md
index 3273fdfb..5c2a112c 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -52,11 +52,14 @@ frontend (React/SSE) → backend (Fastify) → pi --mode rpc → tht/harness →
   There is no verbatim transcript store. A resumed Pi process rebuilds context from
   `tht session show <id>` + the on-disk artifacts.
 
-- **The backend is a thin bridge with no database.** `ThtRunner` shells `tht` subcommands;
-  `PiProcessManager` runs one Pi child per session and bridges its RPC stream;
+- **The backend is a thin bridge with no database of its own.** `ThtRunner` shells `tht`
+  subcommands; `PiProcessManager` runs one Pi child per session and bridges its RPC stream;
   `SessionBridge` maps Pi RPC events → client events (`ui_request`/`text_delta`/`info`);
-  `SseHub` fans them out over SSE to the browser. App settings live in a JSON file
-  (`backend/data/settings.json`), not a DB.
+  `SseHub` fans them out over SSE to the browser. Persistence belongs to the HARNESS, which
+  selects the session repository from the workspace config (`harness/tht/session/repository.py`):
+  filesystem by default, **PostgreSQL when `session_storage` is configured** (server/portable
+  deployment). Settings flow through harness preferences (`tht session preferences`) with
+  `backend/data/settings.json` only as the file fallback for injected runners/tests.
 
 - **Human-in-the-loop gate contract.** The model proposes; a human reviewer decides at gates
   via widgets (`reviewer_select` = single pick — a chosen option carrying a `decision` payload
@@ -75,8 +78,9 @@ frontend (React/SSE) → backend (Fastify) → pi --mode rpc → tht/harness →
 - **Workspaces** (`harness/workspaces/*.yaml`) set the DB target and **absolute**
   `paths.sessions/artifacts/indexes` — for `psd` these point at a *separate, uncommitted* repo
   (`tht-workspace-psd/`). Secrets live ONLY in `harness/.env` (gitignored).
-- **Settings are global** (`backend/data/settings.json`: workspace/provider/model/thinking);
-  the New-session form is question-only.
+- **Settings are global** (workspace/provider/model/thinking, persisted via harness
+  preferences — `backend/data/settings.json` is only the fallback); the New-session form is
+  question-only.
 - **Resume**: a resumable session re-enters at its last incomplete phase. The backend refuses
   resume with 409 when `finalized` or `archived`, and `PiProcessManager.spawnFor` must send
   `/riprendi-sessione <id>` (resume mode) vs `/nuova-domanda` (new) — sending the wrong prompt
diff --git a/PROJECT_STATE.md b/PROJECT_STATE.md
index 3597c581..3f795eb5 100644
--- a/PROJECT_STATE.md
+++ b/PROJECT_STATE.md
@@ -346,8 +346,11 @@ All three layers' deps installed (`npm install` in each, `python -m venv + pip i
   repo `tht-workspace-psd/`, NOT committed here).
 - Secrets live ONLY in `harness/.env` (gitignored; `THT_*` — DB, DWH REST, vector, SSL CA…).
   See `harness/.env.example` for the variable list.
-- App settings (global): `backend/data/settings.json` (gitignored) — `{ workspace, provider,
-  model, thinking }`. The "New session" form is question-only; these settings supply the rest.
+- App settings (global): `{ workspace, provider, model, thinking }`, persisted via harness
+  preferences (`tht session preferences get/set` → the configured session repository —
+  filesystem or Postgres in server mode). `backend/data/settings.json` (gitignored) remains
+  only the file fallback for injected runners/tests. The "New session" form is question-only;
+  these settings supply the rest.
 
 ## Efficiency levers (NL→SQL workflow optimization, 2026-07-08)
 
diff --git a/backend/src/routes/sessions.ts b/backend/src/routes/sessions.ts
index d7d38169..6f228041 100644
--- a/backend/src/routes/sessions.ts
+++ b/backend/src/routes/sessions.ts
@@ -98,7 +98,11 @@ export function sessionRoutes(
               // old failure must not touch its manifest.
               const bound = boundRuntimes.get(id);
               if (bound !== undefined && bound !== rt) return;
-              await runner.failSession(id, workspace).catch(() => undefined);
+              // Best-effort by design (crash path), but a storage outage must be
+              // visible server-side: the manifest stays open and resume remains legal.
+              await runner.failSession(id, workspace).catch((error: unknown) => {
+                console.error(`[session:${id}] failSession persistence failed:`, error);
+              });
             }).catch(() => undefined);
           }
         }
diff --git a/docs/superpowers/plans/2026-07-20-full-audit-remediation-plan.md b/docs/superpowers/plans/2026-07-20-full-audit-remediation-plan.md
new file mode 100644
index 00000000..06fb869a
--- /dev/null
+++ b/docs/superpowers/plans/2026-07-20-full-audit-remediation-plan.md
@@ -0,0 +1,210 @@
+# Full-codebase audit — remediation plan (2026-07-20)
+
+Source: adversarial review (3 Codex reviewers — Skeptic/Architect/Minimalist — per the
+adversarial-review skill) + independent verification of every finding + objective checks.
+Baseline at commit `803b98d`: harness 812 pytest pass (l0/l2 deselected), backend 228,
+frontend 309, both `tsc` clean, **ruff 34 errors** (all in `harness/tests`).
+
+Verdict: **REJECT** (per skill verdict logic: high-severity findings with multi-reviewer
+consensus). The app is functional and green on tests, but ships 5 confirmed high-severity
+defects. Nothing here is data-destroying in the happy path; the highs are silent-wrong-state
+and workflow-integrity classes.
+
+Every finding below was re-verified in the current code by the lead (line numbers checked).
+Two reviewer findings were **rejected** in lead judgment and are listed at the bottom.
+
+---
+
+## FASE 1 — Pi-crash class closure (gate) — ~1h, no behavior change
+
+**1.1 [HIGH] Five gate tools can still crash Pi on an uncaught throw.**
+`harness/.pi/extensions/tht-gate.js` — `reviewer_memory_promote` (execute at ~1343),
+`rewrite_question` (~1431), `write_schema_linking` (~1484), `write_cte_sql` (~1511),
+`write_final_sql` (~1527). Same class as the crash fixed in `87cb806` for the four
+`reviewer_*` tools: `currentPhase()`/`phaseId()`/`tht()` run outside any try/catch; a
+throw rejects the async execute → Node unhandled rejection → Pi dies mid-session.
+FIX: wrap each execute body in the same top-level try/catch → `textResult` pattern.
+VERIFY: `node -c`; grep-test asserting every `registerTool` execute has a top-level try.
+
+## FASE 2 — Workflow integrity (single-source the phase truth) — ~half day
+
+**2.1 [HIGH] WorkflowBar phase labels are fiction from F2 onward.**
+`frontend/src/shell/WorkflowBar.tsx:5-29` hardcodes
+`F2 "Schema linking" / F3 "Exploration" / F4 "SQL plan" / F5 "SQL generation" / F6
+"Validation" / F7 "Review"`, while `harness/workflow.yaml` defines
+`F2 memoria / F3 riscrittura / F4 schema_linking / F5 sintesi / F6 cte / F7 sql_finale`.
+Every live session shows the wrong phase name to the reviewer from F2 on.
+FIX (minimal): correct the two static maps to the canonical sequence.
+FIX (right): backend `GET /workflow/meta` shelling `tht phase meta --json`, frontend
+fetches once per app load with the corrected static map as fallback.
+VERIFY: unit test mapping `tht phase meta --json` ids/names ↔ rendered labels.
+
+**2.2 [HIGH] Gate `forceAdvance` contradicts the canonical SKILL.md.**
+`harness/.pi/skills/tht-sessione/SKILL.md:30-32`: "`advance:true` auto-advances only F2
+(empty memory) and F6 (skipped/empty) — never a phase that recorded substantive
+decisions." But since `6ee5bda`, `reviewer_decide` and `reviewer_schema_linking` with
+`advance:true` **force-advance any phase** after persisting decisions
+(`tht-gate.js` `forceAdvance`, used at ~895 and ~1002). The model reads one contract and
+the gate implements another → nondeterministic workflow shape (phases may skip their
+`reviewer_confirm kind:"phase"` summary gate depending on what the model passes).
+The force-advance behavior was a deliberate product choice (kill the redundant approve
+form); the defect is the contradiction, not the feature.
+FIX: (a) restrict `forceAdvance` to the two designed auto-close gates
+(`reviewer_schema_linking` in F4, `reviewer_memory_promote` in F8 via
+`closeAfterPromotion`); `reviewer_decide` returns to `advanceIfReady` (exit-6 no-op);
+(b) rewrite SKILL.md §"Phase map (advance cheat-sheet)" to document exactly which gates
+auto-advance; (c) add the allowlist as data in `workflow.yaml` (e.g. `advance:
+gate_closes`) so gate and skill read one source.
+VERIFY: L1 test on the allowlist; live smoke on psd (F4 auto-advances, F5 does not).
+
+## FASE 3 — Transport correctness (SSE) — ~half day
+
+**3.1 [HIGH, 3/3 reviewer consensus] Stale `Last-Event-ID` from an older backend
+generation is honored when ids collide.**
+`backend/src/sse/sse-hub.ts:55-63`: the stale-cursor guard only catches
+`cursor > lastId`. After a backend restart, ids restart at 1; a browser auto-reconnect
+carrying cursor N from the old process silently suppresses the new generation's events
+1..N (different content, same ids). Contract 11 in `brain/codebase/workflow-ui-contracts.md`
+is only half-implemented.
+FIX: make the event id a composite `"<generation>:<seq>"` (generation = process-start
+epoch, e.g. `Date.now()` at Hub construction). `Last-Event-ID` is opaque to EventSource,
+so no frontend change: on subscribe, parse the cursor; generation mismatch → treat as 0.
+VERIFY: regression test — two Hub instances, cursor from A replayed against B must
+replay from the beginning.
+
+**3.2 [MEDIUM] Transport state never evicted for finished sessions.**
+`sse-hub.ts:41-44` — `buffers`/`lastIds` grow per session; `forget()` is called only by
+the delete route. Long-lived deployments accumulate state for every session ever touched.
+FIX: call `hub.forget(id)` when a session reaches a terminal state (finalized+agent_end,
+archived) — the transcript UI reads persisted documents, not the SSE buffer.
+VERIFY: unit test — finalize → maps empty for that id.
+
+## FASE 4 — Process & route robustness (backend) — ~half day
+
+**4.1 [MEDIUM] `spawnFor` leaks a live child + registered runtime when `configure()`
+rejects.** `backend/src/pi/pi-process-manager.ts:177-182`: `createFor` registers the
+runtime; if `configure` (set_model/set_thinking RPC) rejects, `spawnFor` throws without
+teardown → the map keeps an apparently-active runtime with a live Pi child; every later
+start gets "session runtime already active".
+FIX: try/catch in `spawnFor` → identity-checked teardown + rethrow.
+VERIFY: unit test with a configure that rejects.
+
+**4.2 [MEDIUM] No timeout on any `tht` call except `dbPing`.**
+`backend/src/tht/tht-runner.ts:67-101`: `run()` supports `timeoutMs` but only `dbPing`
+passes one. A DWH/vector op that hangs (VPN drop mid-call: `sql preview`, `search pack`,
+`ollama ensure`) wedges the HTTP request forever.
+FIX: default timeout in `run()` (60s) + explicit per-call values (dbPing 10s,
+sqlPreview/searchPack 120s). On timeout the existing code-124 path already SIGKILLs.
+VERIFY: unit test with a sleeping fake bin.
+
+**4.3 [MEDIUM] Missing workspace YAML silently falls back to the default config.**
+`tht-runner.ts:51-56`: `configArg("typo")` returns the default `-c` when
+`workspaces/typo.yaml` doesn't exist → sessions/operations silently target the wrong
+workspace (wrong DB, wrong sessions dir).
+FIX: throw on a named-but-missing workspace; let routes surface 500 with the message.
+VERIFY: unit test.
+
+**4.4 [MEDIUM] Resume returns `200 alreadyActive` before the finalized/archived 409.**
+`backend/src/routes/sessions.ts:288-296`: the runtime fast-path short-circuits the
+read-only contract. A finalized session with a lingering running runtime resumes as if
+live.
+FIX: evaluate the manifest 409 first; only then the alreadyActive fast-path.
+VERIFY: existing route test extended (finalized manifest + fake active runtime → 409).
+
+**4.5 [LOW] `ollamaEnsure` treats exit-0 with unparseable stdout as ok.**
+`tht-runner.ts:204-206`. FIX: on code 0 require parsed JSON (else ok:false with detail).
+
+**4.6 [LOW] `respond()` sends stale gate responses with the wrong Pi RPC id.**
+`backend/src/bridge/session-bridge.ts:110-117`: a retried response for gate A while B is
+pending goes out with B's `pendingPiId`; Pi's descriptor-id check re-loops it (transient,
+self-healing). FIX: drop the response unless `pending && uiResponse.id === pending.id`.
+
+## FASE 5 — State integrity (harness + gate persistence) — ~1 day
+
+**5.1 [MEDIUM] `phase reopen` deletes artifacts before recording `phase_reopened`.**
+`harness/tht/cli/phase_cmd.py:124-128`: crash between `teardown_snapshot()` and
+`append_decisions()` → artifacts of later phases deleted but ledger still at the old
+phase; resume enters a phase whose expected artifacts are gone.
+FIX: append `phase_reopened` FIRST, then teardown, and make teardown idempotent +
+re-runnable: on session load, if the folded phase is behind surviving later-phase
+artifacts, re-run the teardown repair pass. (Ledger-first means the half-state is
+"reopened with stale extra artifacts", which the repair pass cleans deterministically.)
+VERIFY: unit test simulating the crash window (teardown raises after ledger append).
+
+**5.2 [MEDIUM] Schema-linking approval persists N decisions non-atomically.**
+`tht-gate.js` ~967-1000: one `tht decision add` per table/column; a transient failure
+mid-loop returns an error with the ledger half-written; a retry re-adds the first K
+decisions (duplicate entries; projection is set-based so the artifact survives, but the
+audit ledger lies).
+FIX: batch the whole review into one CLI call (`tht decision add-batch --doc -` on the
+model of the existing `add-join-set`), atomic single append.
+VERIFY: L1 test; retry after injected failure produces no duplicates.
+
+**5.3 [HIGH] Anti-bypass hook does not cover bash writes to protected state.**
+`tht-gate.js:141-158` + hook 550-585: `FORBIDDEN` blocks specific `tht` subcommands and
+`GATE_CODE_FILES` blocks the `write`/`edit` TOOLS, but plain bash can still mutate
+protected state: `echo '{"type":"phase_approved"...}' >> review_decisions.jsonl`,
+`sed -i` on `session_manifest.yaml`, `cat > .pi/extensions/tht-gate.js`.
+This is defense against a *confused* model (it has already edited its own gate once —
+see memory), not a hostile one; perfect sandboxing is out of scope.
+FIX: extend the bash branch of the tool_call hook with a protected-path pattern: block
+any bash command whose text references `review_decisions.jsonl`, `session_manifest.yaml`,
+`cte_plan.json` or `.pi/extensions/` in a mutating context (`>`, `>>`, `tee`, `sed -i`,
+`mv`, `cp`, `rm`, `python … open(...,'w')`). Read-only mentions (cat/grep) stay allowed.
+VERIFY: L1 tests on the pattern (block list + allow list).
+
+## FASE 6 — Docs & hygiene — ~1h
+
+**6.1 [MEDIUM] CLAUDE.md/PROJECT_STATE describe a storage model that no longer exists.**
+CLAUDE.md says "backend … no database", "App settings live in a JSON file
+(`backend/data/settings.json`)". Since the portable-deployment merge the truth is:
+`harness/tht/session/repository.py:69-86` selects **PostgresSessionRepository** when
+`session_storage` is configured (server mode) vs filesystem; backend settings go through
+harness preferences (`backend/src/app.ts:61-80`), with the JSON file as fallback only.
+FIX: update CLAUDE.md architecture bullets + PROJECT_STATE.md; add one line on when each
+repository/settings path is active.
+
+**6.2 [LOW] ruff: 34 errors in `harness/tests` (19 E702, 13 F401, 1 F841, 1 F541).**
+FIX: `ruff check . --fix` (14 auto), hand-fix the E702 semicolons. Add ruff to whatever
+gate runs before commits (it exists in dev deps; it just isn't enforced).
+
+**6.3 [LOW] Replay server drifts from the real REST surface.**
+`tools/replay/server.mjs`: `/me` is missing (SPA calls it on boot; replay serves the SPA
+HTML → JSON parse noise); resume-shape drift was just fixed (`803b98d`) — audit the
+remaining routes against `backend/src/routes/*.ts` and stub what the SPA actually calls.
+VERIFY: replay boot with devtools console clean.
+
+**6.4 [LOW] `failSession` failures are silently discarded (deliberate).**
+`backend/src/routes/sessions.ts:111`: keep the swallow (crash-path best effort) but add a
+`console.error` so a storage outage is at least visible server-side.
+
+---
+
+## Rejected reviewer findings (lead judgment)
+
+- *Minimalist:* "`harness/README.md` references `docs/testing.md` which is absent" —
+  **rejected**: the file exists (`harness/docs/testing.md`).
+- *Minimalist:* "bridge `respond()` lets a stale response wedge gate B" — **downgraded**
+  to 4.6: Pi's own descriptor-id check re-loops the gate; the flaw is real but transient.
+- *Skeptic:* "failSession swallow leaves contradictory state" [medium] — **downgraded**
+  to 6.4: the catch is deliberate crash-path tolerance; only observability is missing.
+
+## What went well (3/3 reviewers found no issues here)
+
+- Pi runtime identity checks, duplicate-start protection, per-session lifecycle
+  single-flight in the routes.
+- `-c` per-subcommand placement and `--json` purity (checked end to end).
+- Tool-event sanitization across the backend/client boundary (contract 5).
+- Phase folding / ledger mutation core logic and its test coverage.
+
+## Suggested execution order
+
+Fase 1 (crash class, 1h) → 2.1+2.2 (workflow integrity) → 3.1 (SSE generation) →
+4.1-4.4 → 5.1-5.3 → 3.2 + Fase 6. Fasi 1-4 are independent of each other and safe to
+land as separate commits; 5.1 and 5.2 touch the ledger contract and deserve their own
+review pass.
+
+## Environment note
+
+The machine's `codex` CLI was broken (configured default model requires a newer CLI);
+upgraded via Homebrew 0.137.0 → 0.144.6 to run the reviewers.
diff --git a/harness/tests/l0/test_db_connection.py b/harness/tests/l0/test_db_connection.py
index f762427f..b8d58c61 100644
--- a/harness/tests/l0/test_db_connection.py
+++ b/harness/tests/l0/test_db_connection.py
@@ -7,7 +7,7 @@ is not assumed reliable' gains real teeth for the data layer.
 import pytest
 from sqlalchemy import create_engine, text
 
-from tht.db.connection import can_create_in_schema, make_engine, ping, writable_tables
+from tht.db.connection import can_create_in_schema, ping, writable_tables
 
 pytestmark = [pytest.mark.l0]
 
diff --git a/harness/tests/l2/test_memory_save_one_real.py b/harness/tests/l2/test_memory_save_one_real.py
index c7e2aa74..7861eff8 100644
--- a/harness/tests/l2/test_memory_save_one_real.py
+++ b/harness/tests/l2/test_memory_save_one_real.py
@@ -9,7 +9,6 @@ Run: pytest -m l2 tests/l2/test_memory_save_one_real.py -s  (needs .env + VPN +
 """
 from datetime import datetime
 from pathlib import Path
-from unittest.mock import MagicMock
 
 import pytest
 
diff --git a/harness/tests/l2/test_session_ablazione.py b/harness/tests/l2/test_session_ablazione.py
index ef3172c0..d1c1b218 100644
--- a/harness/tests/l2/test_session_ablazione.py
+++ b/harness/tests/l2/test_session_ablazione.py
@@ -71,7 +71,7 @@ def test_ablazione_session_manual(l2_env, tmp_path):
                  ["THT_DWH_API_KEY", "THT_VEC_API_KEY", "THT_VEC_WRITE_API_KEY"])
     assert env_ok
     assert WORKSPACE.exists()
-    print(f"\n[L2 manual] launch: pi --mode rpc (cwd=harness/)")
+    print("\n[L2 manual] launch: pi --mode rpc (cwd=harness/)")
     print(f"[L2 manual] /nuova-domanda \"{QUESTION}\"")
     print("[L2 manual] confirm: sql_final.sql present + ledger has value_grounded/"
           "concept_formula_approved. Session dir:", tmp_path)
diff --git a/harness/tests/l2/test_value_grounding_real.py b/harness/tests/l2/test_value_grounding_real.py
index 0e63a844..6bf54676 100644
--- a/harness/tests/l2/test_value_grounding_real.py
+++ b/harness/tests/l2/test_value_grounding_real.py
@@ -25,7 +25,6 @@ def test_ablazione_returns_multiple_columns(l2_env):
     non-collapsing aggregation. Requires a built LSH index (tht lsh build)."""
     if not WORKSPACE.exists():
         pytest.skip(f"per-customer workspace repo not found: {WORKSPACE} (clone tht-workspace-psd)")
-    from tht.config import LshConfig
     try:
         from tht.lshindex import load_index, query_index  # ported with the lsh build path
     except ModuleNotFoundError:
diff --git a/harness/tests/test_ctetest.py b/harness/tests/test_ctetest.py
index 0074a207..890e7841 100644
--- a/harness/tests/test_ctetest.py
+++ b/harness/tests/test_ctetest.py
@@ -9,7 +9,6 @@ Pure logic, no DB.
 import json
 from datetime import date, datetime
 from decimal import Decimal
-from pathlib import Path
 
 import pytest
 
diff --git a/harness/tests/test_decisions_retract.py b/harness/tests/test_decisions_retract.py
index 0d5bc696..cf002cae 100644
--- a/harness/tests/test_decisions_retract.py
+++ b/harness/tests/test_decisions_retract.py
@@ -8,7 +8,7 @@ def test_decision_retracted_in_audit_but_marked(tmp_path):
     d1 = append_decision(
         session, type="table_promoted", subject="phase:4", detail="t1", rationale="r"
     )
-    d2 = append_decision(
+    append_decision(
         session,
         type="decision_retracted",
         subject="phase:4",
diff --git a/harness/tests/test_execute_inject_limit.py b/harness/tests/test_execute_inject_limit.py
index 00c905be..3449640d 100644
--- a/harness/tests/test_execute_inject_limit.py
+++ b/harness/tests/test_execute_inject_limit.py
@@ -6,7 +6,6 @@ These tests pin: LIMIT added when absent, respected when present, never added to
 non-query statements, and the truncation-detection contract (limit+1 rows).
 Pure logic, no DB.
 """
-import pytest
 import sqlglot
 
 from tht.execute import _inject_limit
diff --git a/harness/tests/test_formula.py b/harness/tests/test_formula.py
index ce2a2d12..e7e636b7 100644
--- a/harness/tests/test_formula.py
+++ b/harness/tests/test_formula.py
@@ -6,9 +6,7 @@ surfaces a candidate formula, the reviewer approves or rejects it (recorded via
 concept_formula_approved / concept_formula_rejected), and approved formulas are
 part of the schema-linking artifact. The store is frontmatter-YAML + SQL body.
 """
-from pathlib import Path
 
-import pytest
 
 from tht.evidence.formula_store import ConceptFormula, retrieve_formula, save_formula
 
diff --git a/harness/tests/test_freetext_interpretation.py b/harness/tests/test_freetext_interpretation.py
index 0c49f2ea..329f9a97 100644
--- a/harness/tests/test_freetext_interpretation.py
+++ b/harness/tests/test_freetext_interpretation.py
@@ -7,7 +7,6 @@ enforced by the skill prose + gate, validated at L2; this test pins the RECORDIN
 contract the gate relies on: free text from "Altro" must round-trip into the
 decision rationale and survive persistence, never silently discarded.
 """
-from pathlib import Path
 
 from tht.decisions import append_decision, list_decisions
 
diff --git a/harness/tests/test_mschema_eligibility.py b/harness/tests/test_mschema_eligibility.py
index d71ec4cf..98b7d8a7 100644
--- a/harness/tests/test_mschema_eligibility.py
+++ b/harness/tests/test_mschema_eligibility.py
@@ -9,7 +9,6 @@ from datetime import datetime
 from tht.config import EligibilityConfig
 from tht.mschema.eligibility import classify_all, classify_column, effective_eligibility
 from tht.mschema.models import (
-    Annotations,
     ColumnAnnotation,
     ColumnPhysical,
     PhysicalSchema,
diff --git a/harness/tests/test_phase_effective.py b/harness/tests/test_phase_effective.py
index ef65b529..eefcd985 100644
--- a/harness/tests/test_phase_effective.py
+++ b/harness/tests/test_phase_effective.py
@@ -17,7 +17,8 @@ def test_effective_decisions_excludes_stale_high_phase(tmp_path):
     Sequenza: approva 1, approva 2, reopen a 1, poi table_promoted:4.
     current_phase diventa 1 (il reopen). La table_promoted:4 e' di fase 4 > 1 -> stale.
     """
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     _d(s, "phase_approved", "phase:1")
     _d(s, "phase_approved", "phase:2")
     _d(s, "phase_reopened", "phase:1")
@@ -30,7 +31,8 @@ def test_effective_decisions_excludes_stale_high_phase(tmp_path):
 
 def test_current_phase_after_reopen(tmp_path):
     """Il fold su audit-excluding-retracted gestisce correttamente il reopen e le ri-approvazioni."""
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     _d(s, "phase_approved", "phase:1")
     _d(s, "phase_approved", "phase:2")
     assert current_phase(s) == 3  # dopo 2 approvazioni -> fase 3
@@ -42,7 +44,8 @@ def test_current_phase_after_reopen(tmp_path):
 
 def test_retracted_decision_excluded_from_effective(tmp_path):
     """Una decisione ritirata (decision_retracted) e' esclusa dalla vista effective."""
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     d1 = _d(s, "table_promoted", "phase:4", detail="t1")
     _d(s, "decision_retracted", "phase:4", retracts=d1.seq)
     # senza approvazioni di fase, current_phase=1; table_promoted:4 e' gia' > 1.
@@ -60,13 +63,15 @@ def test_retracted_decision_excluded_from_effective(tmp_path):
 
 
 def test_current_phase_starts_at_1(tmp_path):
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     assert current_phase(s) == 1
 
 
 def test_current_phase_clamps_at_max_plus_1(tmp_path):
     """Dopo tutte le approvazioni, current_phase = max_phase + 1."""
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     for n in range(1, 9):
         _d(s, "phase_approved", f"phase:{n}")
     assert current_phase(s) == 9  # max_phase(8) + 1
@@ -74,7 +79,8 @@ def test_current_phase_clamps_at_max_plus_1(tmp_path):
 
 def test_effective_keeps_low_phase_after_high_phase_rollback(tmp_path):
     """Rollback a F4 NON invalida le decisioni delle fasi 1-3 (che restano <= current_phase)."""
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     _d(s, "concept_clarified", "phase:1", detail="x")
     _d(s, "question_rewritten", "phase:3", detail="q")
     _d(s, "table_promoted", "phase:4", detail="t")
@@ -97,7 +103,8 @@ def test_effective_keeps_low_phase_after_high_phase_rollback(tmp_path):
 
 def test_effective_decisions_no_reopen_returns_all_non_retracted(tmp_path):
     """Senza reopen e senza retract, effective = tutte le decisioni (della fase corrente)."""
-    s = tmp_path / "s"; s.mkdir()
+    s = tmp_path / "s"
+    s.mkdir()
     _d(s, "concept_clarified", "phase:1", detail="x")
     _d(s, "phase_approved", "phase:1")
     assert current_phase(s) == 2
diff --git a/harness/tests/test_sql_preview_json.py b/harness/tests/test_sql_preview_json.py
index a1d36997..5d0bba53 100644
--- a/harness/tests/test_sql_preview_json.py
+++ b/harness/tests/test_sql_preview_json.py
@@ -6,7 +6,6 @@ Pure-logic tests (no DB needed):
 """
 import json
 
-import pytest
 
 from tht.execute.limit import inject_limit_offset
 
diff --git a/harness/tests/test_sqlcheck.py b/harness/tests/test_sqlcheck.py
index e6e44832..696a9de1 100644
--- a/harness/tests/test_sqlcheck.py
+++ b/harness/tests/test_sqlcheck.py
@@ -12,7 +12,7 @@ from tht.mschema.models import (
     PhysicalSchema,
     TablePhysical,
 )
-from tht.sqlcheck import CheckResult, validate_sql
+from tht.sqlcheck import validate_sql
 
 
 def _schema() -> PhysicalSchema:
diff --git a/harness/tests/test_taskdoc.py b/harness/tests/test_taskdoc.py
index 62a62d7a..665524c5 100644
--- a/harness/tests/test_taskdoc.py
+++ b/harness/tests/test_taskdoc.py
@@ -1,10 +1,10 @@
-from pathlib import Path
 
 from tht.taskdoc import generate_task_doc
 
 
 def test_task_doc_includes_question_and_schema_scope(tmp_path):
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("# Domanda\nQuanti pazienti?\n## Assunzioni\n- a")
     (s / "schema_linking.json").write_text(
         '{"question":"q","candidates":[{"kind":"table","name":"pazienti"}],"joins":[],"excluded":[],"open_questions":[]}'
@@ -17,7 +17,8 @@ def test_task_doc_includes_question_and_schema_scope(tmp_path):
 
 def test_task_doc_never_embeds_full_physical_yaml(tmp_path):
     """physical.yaml e' fatale per un 35B/<200k (~190k token). Mai incorporarlo."""
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("q")
     # un physical.yaml enorme fuori dalla sessione (come in ChironeWp3: artifacts/mschema/)
     (s.parent / "physical.yaml").write_text("x: " + "y" * 800_000)
@@ -27,7 +28,8 @@ def test_task_doc_never_embeds_full_physical_yaml(tmp_path):
 
 
 def test_task_doc_byte_budget_enforced_on_normal_input(tmp_path):
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("q")
     doc = generate_task_doc(session_dir=s, phase=1)
     assert doc.byte_budget_ok is True
@@ -35,7 +37,8 @@ def test_task_doc_byte_budget_enforced_on_normal_input(tmp_path):
 
 def test_task_doc_byte_budget_violation_flagged(tmp_path):
     """Se un artefatto di sessione e' enorme (input perverso), byte_budget_ok diventa False."""
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("q")
     (s / "schema_linking.json").write_text("x: " + "y" * 400_000)  # ~400KB -> over budget
     doc = generate_task_doc(session_dir=s, phase=7)
@@ -43,7 +46,8 @@ def test_task_doc_byte_budget_violation_flagged(tmp_path):
 
 
 def test_task_doc_carries_phase_header(tmp_path):
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("q")
     doc = generate_task_doc(session_dir=s, phase=4)
     assert "fase 4" in doc.body.lower() or "fase 4" in doc.body
@@ -54,7 +58,8 @@ def test_task_doc_excludes_stale_decisions_post_rollback(tmp_path):
     Dopo rollback a F4, una sql_approved:7 stale non appare nel brief delle decisioni."""
     from tht.decisions import append_decision
     from tht.phase import current_phase
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("q")
     # simula: lavoro fino a F7, poi rollback a F4
     append_decision(s, type="phase_approved", subject="phase:1")
diff --git a/harness/tests/test_teardown.py b/harness/tests/test_teardown.py
index 8fe668c1..53a67c13 100644
--- a/harness/tests/test_teardown.py
+++ b/harness/tests/test_teardown.py
@@ -2,7 +2,8 @@ from tht.teardown import teardown_to_phase
 
 
 def test_teardown_to_phase_4_deletes_phase5plus_artifacts(tmp_path):
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "schema_linking.json").write_text("{}")    # F4 artifact
     (s / "cte_plan.json").write_text("[]")          # F6 artifact
     (s / "ctes").mkdir()
@@ -19,7 +20,8 @@ def test_teardown_to_phase_4_deletes_phase5plus_artifacts(tmp_path):
 
 def test_teardown_to_phase_1_deletes_everything(tmp_path):
     """Rollback a F1 cancella tutti gli artefatti (tutte le fasi > 1)."""
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "question.md").write_text("q")             # F3 artifact
     (s / "schema_linking.json").write_text("{}")    # F4 artifact
     (s / "cte_plan.json").write_text("[]")          # F6 artifact
@@ -37,7 +39,8 @@ def test_teardown_to_phase_1_deletes_everything(tmp_path):
 
 def test_teardown_to_phase_7_preserves_phase6_artifacts(tmp_path):
     """Rollback a F7 preserva gli artefatti delle fasi <= 7."""
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "schema_linking.json").write_text("{}")    # F4 artifact
     (s / "cte_plan.json").write_text("[]")          # F6 artifact
     (s / "ctes").mkdir()
@@ -52,14 +55,16 @@ def test_teardown_to_phase_7_preserves_phase6_artifacts(tmp_path):
 
 
 def test_teardown_to_phase_on_empty_session_is_noop(tmp_path):
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     report = teardown_to_phase(s, target_phase=4)
     assert report.deleted_files == []
 
 
 def test_teardown_to_phase_nonexistent_artifacts_no_error(tmp_path):
     """Se gli artefatti non esistono (sessione nuova), teardown non fallisce."""
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     report = teardown_to_phase(s, target_phase=1)
     assert report.deleted_files == []
 
@@ -67,7 +72,8 @@ def test_teardown_to_phase_nonexistent_artifacts_no_error(tmp_path):
 def test_teardown_deletes_orphaned_cte_files_not_in_current_plan(tmp_path):
     """Il bug degli orfani CTE: dopo un re-derive con piano diverso, i vecchi .sql
     non piu' nel piano restano su disco e bloccano finalize. teardown li pulisce."""
-    s = tmp_path / "sess"; s.mkdir()
+    s = tmp_path / "sess"
+    s.mkdir()
     (s / "ctes").mkdir()
     (s / "ctes" / "old_cte.sql").write_text("SELECT 1")   # orphan
     (s / "ctes" / "another.sql").write_text("SELECT 2")   # orphan
diff --git a/harness/tests/test_workspace.py b/harness/tests/test_workspace.py
index e373b475..681d3d3c 100644
--- a/harness/tests/test_workspace.py
+++ b/harness/tests/test_workspace.py
@@ -1,4 +1,3 @@
-from pathlib import Path
 
 from tht.workspace import load_workspace, WorkspaceError
 
diff --git a/tools/replay/server.mjs b/tools/replay/server.mjs
index b7d44c56..f457757a 100644
--- a/tools/replay/server.mjs
+++ b/tools/replay/server.mjs
@@ -334,6 +334,17 @@ const server = createServer(async (req, res) => {
   }
 
   // --- REST stubs the SPA needs to boot -----------------------------------
+  // The SPA queries /me at boot (principal for session scoping/admin UI). Falling
+  // through to the static handler served HTML that apiFetch tried to parse as JSON.
+  if (method === "GET" && path === "/me") {
+    return sendJson(res, 200, {
+      issuer: "replay", subject: "reviewer@replay", displayName: "Replay reviewer", isAdmin: true,
+    });
+  }
+  // Boot-time best-effort warmup: a no-op in replay (no Pi runtime exists).
+  if (method === "POST" && path === "/runtime/prewarm") {
+    return sendNoContent(res);
+  }
   if (method === "GET" && path === "/health") {
     return sendJson(res, 200, { ok: true, replay: true, gates: GATES.length });
   }