ThothII/.superpowers/sdd/predeploy-fix-report.md

Pre-deployment Fix Wave Report

Date: 2026-07-14 Worktree: /home/chirone/ThothII/.worktrees/activity-log-cte-layout Base: e5366d14a6da8fb331d94be60b8929cefb1fe3e0

Outcome

All three reviewed findings are implemented in one coherent backend/frontend wave:

1. Resume leaves the prior selection, Zustand state, document panel, and EventSource untouched until POST /resume succeeds. Cold Resume changes state and reconnects only after backend clear/rebind; already-active same-session Resume preserves the existing binding; failure is a no-op apart from the fixed toast.
2. SSE uses monotonically increasing per-session ids, cursor-filtered replay, native and manual reconnect cursors, id continuity across hub.clear, and descriptor-id pending-gate idempotence at both backend and frontend layers.
3. Generic Pi system events and readiness errors are projected through explicit public allowlists. Sentinel URLs, paths, tokens, stderr, commands, and extra fields do not reach HTTP or SSE.

No harness, workflow, persistence, model, CTE viewer, CTE card, or shared Card file changed.

Interfaces

• Frontend resumeSession(id) now returns Promise<{ id: string; alreadyActive: boolean }> via ResumeSessionResult.
• Backend successful Resume always returns the same shape:
  • running/waiting runtime: { id, alreadyActive: true }
  • validated cold runtime: { id, alreadyActive: false }
• SseHub.publish(sessionId, event, data): number returns the assigned SSE id.
• SseHub.subscribe(sessionId, send, { afterId, pending }) calls send(event, data, id) for replay/live frames with id > afterId.
• GET /sessions/:id/events accepts native Last-Event-ID and manual ?lastEventId=<integer>; when both are valid it uses the greater cursor.
• Every emitted SSE frame is id: <n>\nevent: <name>\ndata: <json>\n\n.
• Public readiness failure is exactly: Session services are not ready. Check configuration and connectivity, then try again.
• Generic Pi system events are exactly { type: "system_event", event }, and event must be a non-empty string.

Files

Backend production:

• backend/src/bridge/session-bridge.ts
• backend/src/routes/sessions.ts
• backend/src/sse/sse-hub.ts

Backend tests:

• backend/test/routes-sessions.test.ts
• backend/test/session-bridge.test.ts
• backend/test/sse-hub.test.ts
• backend/test/sse-route.test.ts (new)

Frontend production/support:

• frontend/src/api/sessions.ts
• frontend/src/api/types.ts
• frontend/src/shell/AppShell.tsx
• frontend/src/store/sessionStore.ts
• frontend/src/stream/useSessionStream.ts
• frontend/src/test/fakeEventSource.ts

Frontend tests:

• frontend/src/api/sessions.test.ts
• frontend/src/shell/AppShell.session-mgmt.test.tsx
• frontend/src/store/sessionStore.test.ts
• frontend/src/stream/useSessionStream.test.tsx

TDD RED/GREEN evidence

1. Backend Resume result and client-boundary allowlists

RED command:

cd backend && npx vitest run test/routes-sessions.test.ts test/session-bridge.test.ts

RED output (exit 1):

Test Files  2 failed (2)
Tests       6 failed | 35 passed (41)

expected { id: 's1' } to deeply equal { id: 's1', alreadyActive: false }
expected raw readiness URL/token/path to equal the fixed public message
expected three raw generic system events to equal [{ type: 'system_event', event: 'session_exit' }]

GREEN command:

cd backend && npx vitest run test/routes-sessions.test.ts test/session-bridge.test.ts

GREEN output (exit 0):

✓ test/session-bridge.test.ts (14 tests)
✓ test/routes-sessions.test.ts (27 tests)
Test Files  2 passed (2)
Tests       41 passed (41)

2. Backend exact-once SseHub and route framing

RED command:

cd backend && npx vitest run test/sse-hub.test.ts test/sse-route.test.ts

RED output (exit 1):

Test Files  2 failed (2)
Tests       7 failed (7)

expected [undefined, undefined, undefined] to deeply equal [1, 2, 3]
expected unconditional replay not to contain "one" / "two"
expected one buffered pending gate, received replay plus a second pending emission

GREEN command:

cd backend && npx vitest run test/sse-hub.test.ts test/sse-route.test.ts

GREEN output (exit 0):

✓ test/sse-hub.test.ts (4 tests)
✓ test/sse-route.test.ts (3 tests)
Test Files  2 passed (2)
Tests       7 passed (7)

3. Frontend cursor tracking and gate idempotence

RED command:

cd frontend && npx vitest run src/stream/useSessionStream.test.tsx src/store/sessionStore.test.ts

RED output (exit 1):

Test Files  2 failed (2)
Tests       2 failed | 28 passed (30)

expected /sessions/s1/events to be /sessions/s1/events?lastEventId=7
expected duplicate gate pendingWidget to remain null, received gate-1

GREEN command:

cd frontend && npx vitest run src/stream/useSessionStream.test.tsx src/store/sessionStore.test.ts

GREEN output (exit 0):

✓ src/store/sessionStore.test.ts (23 tests)
✓ src/stream/useSessionStream.test.tsx (7 tests)
Test Files  2 passed (2)
Tests       30 passed (30)

4. Frontend typed Resume and AppShell ordering/preservation

Typed API RED command:

cd frontend && npx tsc -b

Typed API RED output (exit 1):

src/api/sessions.test.ts(43,9): error TS2322: Type 'void' is not assignable to type
'{ id: string; alreadyActive: boolean; }'.

Lifecycle RED command:

cd frontend && npx vitest run src/api/sessions.test.ts src/shell/AppShell.session-mgmt.test.tsx

Lifecycle RED output (exit 1):

✓ src/api/sessions.test.ts (9 tests)
❯ src/shell/AppShell.session-mgmt.test.tsx (15 tests | 4 failed)
Test Files  1 failed | 1 passed (2)
Tests       4 failed | 20 passed (24)

already-active same-session Resume created two EventSources instead of one
deferred cold Resume closed the document panel before POST completion
failed same-session Resume closed the prior EventSource
failed Resume with no active session opened an EventSource

GREEN commands:

cd frontend && npx vitest run src/api/sessions.test.ts src/shell/AppShell.session-mgmt.test.tsx
cd frontend && npx tsc -b

GREEN output (exit 0):

✓ src/api/sessions.test.ts (9 tests)
✓ src/shell/AppShell.session-mgmt.test.tsx (15 tests)
Test Files  2 passed (2)
Tests       24 passed (24)
TypeScript: no output, exit 0

The AppShell cold-reconnect test additionally proves that the old source accepts an event while Resume is pending, the replacement URL carries lastEventId=8, the replacement receives one post-resume transcript/activity row, and two deliveries of the same descriptor id yield one gate.

Affected verification

Backend command:

cd backend && npx vitest run test/routes-sessions.test.ts test/session-bridge.test.ts \
  test/sse-hub.test.ts test/sse-route.test.ts test/health.test.ts test/e2e-f1.test.ts

Output (exit 0):

Test Files  6 passed (6)
Tests       52 passed (52)

Backend typecheck:

cd backend && npx tsc --noEmit -p .

Output: no output, exit 0.

Frontend command:

cd frontend && npx vitest run src/api/sessions.test.ts src/store/sessionStore.test.ts \
  src/stream/useSessionStream.test.tsx src/shell/AppShell.session-mgmt.test.tsx \
  src/shell/CentralStatus.test.tsx src/shell/ModelActivityPanel.test.tsx \
  src/shell/f1-loop.test.tsx src/shell/AppShell.new-session.test.tsx

Output (exit 0):

Test Files  8 passed (8)
Tests       74 passed (74)

Frontend typecheck:

cd frontend && npx tsc -b

Output: no output, exit 0.

Full verification

Backend full suite:

cd backend && npx vitest run

Test Files  22 passed (22)
Tests       177 passed (177)

Frontend full suite:

cd frontend && npx vitest run

Test Files  43 passed (43)
Tests       271 passed (271)

Backend production build:

cd backend && npm run build
> tsc -p tsconfig.json
exit 0

Frontend production build:

cd frontend && npm run build
> tsc -b && vite build
✓ 4835 modules transformed.
✓ built in 8.25s
exit 0

Integrated re-review closure (2026-07-15)

This section supersedes the earlier cold same-session assertion that the replacement URL carries lastEventId=8. That behavior was correct only while the backend process and its in-memory id sequence survived. A restarted backend begins a fresh sequence, so a successful cold Resume now explicitly discards the browser's cursor before replacing the EventSource.

All four integrated re-review findings are closed:

1. AppShell passes a dedicated cursor-reset epoch to useSessionStream. A cold same-session Resume increments it only after alreadyActive: false; a high cursor such as 901 is omitted from the replacement URL and fresh low-id events/gates are consumed. An already-active same-session Resume still preserves its source, cursor, and store.
2. useSessionStream no longer mutates the cursor ref during render. Effect setup resets cursor state on session/reset-epoch changes, callbacks are guarded by a captured active-source identity, and cleanup clears only its own active identity. A queued event from the replaced source cannot write the new store or poison its next reconnect URL.
3. Backend Resume is serialized per session and rechecks runtime state inside the lock. Manifest, readiness, and reopen validation precede the transport commit. Idle/failed replacement creates and binds the new runtime before hub.clear, which occurs synchronously immediately before the first Resuming session publish. Reopen/create failure returns exactly Session could not be resumed. Check configuration and connectivity, then try again., keeps the prior hub buffer/subscribers attached, and does not expose exception sentinels. Concurrent calls perform one cold start and the waiter returns alreadyActive: true.
4. SseHub.forget(id) removes subscribers, buffered events, and the last id. Permanent session DELETE invokes it after disk deletion; ordinary close and Resume continue to use clear, which preserves the id sequence.

Re-review files

Production:

• backend/src/pi/pi-process-manager.ts
• backend/src/routes/sessions.ts
• backend/src/sse/sse-hub.ts
• frontend/src/shell/AppShell.tsx
• frontend/src/stream/useSessionStream.ts

Tests/support:

• backend/test/pi-process-manager.test.ts
• backend/test/routes-sessions.test.ts
• backend/test/sse-hub.test.ts
• frontend/src/shell/AppShell.session-mgmt.test.tsx
• frontend/src/stream/useSessionStream.test.tsx
• frontend/src/test/fakeEventSource.ts

Re-review TDD RED/GREEN evidence

Frontend RED command:

cd frontend && npx vitest run src/stream/useSessionStream.test.tsx \
  src/shell/AppShell.session-mgmt.test.tsx

RED output (exit 1):

Test Files  2 failed (2)
Tests       3 failed | 21 passed (24)

reset epoch: expected the old source to close, received false
cold same-session: expected /sessions/s1/events, received ?lastEventId=901
stale source: expected an empty transcript, received "stale session one"

Frontend GREEN command:

cd frontend && npx vitest run src/stream/useSessionStream.test.tsx \
  src/shell/AppShell.session-mgmt.test.tsx
cd frontend && npx tsc -b

GREEN output (exit 0):

Test Files  2 passed (2)
Tests       24 passed (24)
TypeScript: no output, exit 0

Backend RED command:

cd backend && npx vitest run test/sse-hub.test.ts test/routes-sessions.test.ts

RED output (exit 1):

Test Files  2 failed (2)
Tests       8 failed | 28 passed (36)

three Resume ordering assertions observed clear before reopen/create
reopen and create sentinels escaped as raw HTTP 500 responses
the concurrent waiter cold-started again instead of returning alreadyActive: true
SseHub.forget was absent and DELETE did not invoke permanent cleanup

Backend GREEN command:

cd backend && npx vitest run test/sse-hub.test.ts test/routes-sessions.test.ts
cd backend && npx tsc --noEmit -p .

GREEN output (exit 0):

Test Files  2 passed (2)
Tests       36 passed (36)
TypeScript: no output, exit 0

The failure tests publish a post-failure probe through the same hub and prove that a subscriber attached before either reopen or create rejection still receives it. The concurrency test overlaps two same-id requests behind a deferred reopen and proves one manifest/readiness/reopen/create/clear sequence.

Initial re-review verification (before independent-review hardening)

cd backend && npx vitest run
Test Files  22 passed (22)
Tests       182 passed (182)

cd frontend && npx vitest run
Test Files  43 passed (43)
Tests       273 passed (273)

cd backend && npm run build
> tsc -p tsconfig.json
exit 0

cd frontend && npm run build
> tsc -b && vite build
✓ 4835 modules transformed.
✓ built in 8.46s
exit 0

git diff --check produced no output (exit 0). The frontend build retains its pre-existing large-chunk warning; no new build or type errors were introduced.

Final whitespace verification:

git diff --check
no output, exit 0

Self-review

• Resume sequencing: reopen and runtime binding precede backend clear and HTTP success; frontend state mutation and cursor-reset epoch follow it. Failure catch only emits fixed UI copy.
• Already active: same-session returns before reset/generation/manifest repaint; different session resets the single-session store and binds the new id only after success.
• SSE exact-once: ids are transport identity, not content hashes; replay is strictly id > cursor; clear retains the counter; pending gate matching uses only descriptor id.
• Cursor behavior: hook tracks MessageEvent.lastEventId, carries it only to an ordinary same-id generation, and resets it on session-id/cold-runtime epoch change. Native EventSource reconnect remains supported by the route header.
• Gate defense: the Zustand set survives pending clear but resets with the session store.
• Client boundary: raw ensure.error is unused in public responses; generic Pi system events are reconstructed rather than spread; frontend type mirrors the two-field event.
• Scope: git diff contains no CTE/Card/harness/workflow/persistence/model changes. Four pre-existing modified .superpowers/sdd/{progress,task-2-report,task-3-report,task-4-report}.md files are user work and are excluded from staging.

Remaining concerns

• The 200-event SSE ring limit remains intentional. A brand-new page can reconstruct only retained backlog; an in-memory same-session reconnect is exact-once from its cursor.
• Per-session sequence counters remain in backend memory after clear by design so later in-process cold same-id Resume cannot reuse ids. Permanent DELETE removes the counter via forget.
• The Delete-then-Resume adversarial route test proves the deleted session is not resurrected but currently receives the runner's generic HTTP 500 when sessionShow can no longer find it. A future API cleanup can normalize that missing-session response to 404 or 409.
• Frontend tests still print pre-existing MSW unhandled-request and React ref/act warnings even though all 276 tests pass. The frontend production build still reports pre-existing large chunk warnings. Neither warning class was introduced or expanded by this change.
• No live Pi/DWH smoke was run; this wave changes only REST/SSE/frontend lifecycle boundaries and is covered by fake-Pi, live Fastify SSE, component, full-suite, typecheck, and production-build gates.

Independent-review hardening

The required independent review was run repeatedly against the uncommitted diff. Its first pass found four Important lifecycle edges beyond the integrated findings: queued old-runtime callbacks, post-spawn construction cleanup, concurrent frontend Resume completions, and the passive-effect commit window. Its second pass confirmed those fixes and identified one remaining Important retention issue in the new runtime-identity map. The final pass reported no Critical, Important, or Minor findings and assessed the diff ready to merge.

The resulting hardening is:

• Runtime bridge callbacks are gated by the bound runtime identity. Replacement, close, and DELETE invalidate the old identity, so queued old events cannot publish or call failSession. An active runtime removed by the manager can still publish its complete public failure sequence; after the terminal unmanaged agent_end, its binding is released and later events are rejected.
• PiProcessManager kills the spawned child and removes any registered map entry if either spawn-boundary stderr setup or later RPC/bridge/map initialization throws.
• Resume completion compares against synchronously maintained current active-session identity. Concurrent alreadyActive: false then alreadyActive: true results preserve the cold source, cursor, store, and replayed gate.
• Stream source replacement uses a layout effect. A deterministic later-layout-effect test delivers a queued old event inside the former commit-to-passive-cleanup window and proves it is ignored.
• Cursor tests cover both a restarted backend's fresh low ids and an in-process hub's preserved high ids followed by a cursor-bearing ordinary reconnect.

Hardening TDD RED/GREEN evidence

Backend identity/construction RED command:

cd backend && npx vitest run test/pi-process-manager.test.ts test/routes-sessions.test.ts

Test Files  2 failed (2)
Tests       3 failed | 69 passed (72)

post-spawn reader initialization did not kill the child
replaced and deleted runtime callbacks still called failSession/published

Additional spawn-boundary and terminal-release RED checks:

cd backend && npx vitest run test/pi-process-manager.test.ts \
  -t "spawn boundary initialization"
Tests       1 failed | 38 skipped (39)

cd backend && npx vitest run test/routes-sessions.test.ts -t "terminal sequence"
Tests       1 failed | 34 skipped (35)

Frontend concurrency/layout RED command:

cd frontend && npx vitest run src/stream/useSessionStream.test.tsx \
  src/shell/AppShell.session-mgmt.test.tsx

Test Files  2 failed (2)
Tests       2 failed | 25 passed (27)

the later-layout-effect event wrote "commit-window stale text"
the false→true completion pair erased pending gate "cold-gate"

Final focused GREEN commands:

cd backend && npx vitest run test/pi-process-manager.test.ts \
  test/routes-sessions.test.ts test/sse-hub.test.ts
cd backend && npx tsc --noEmit -p .

Test Files  3 passed (3)
Tests       79 passed (79)
TypeScript: no output, exit 0

cd frontend && npx vitest run src/stream/useSessionStream.test.tsx \
  src/shell/AppShell.session-mgmt.test.tsx
cd frontend && npx tsc -b

Test Files  2 passed (2)
Tests       27 passed (27)
TypeScript: no output, exit 0

Final full verification after review hardening

cd backend && npx vitest run
Test Files  22 passed (22)
Tests       188 passed (188)

cd frontend && npx vitest run
Test Files  43 passed (43)
Tests       276 passed (276)

cd backend && npm run build
> tsc -p tsconfig.json
exit 0

cd frontend && npm run build
> tsc -b && vite build
✓ 4835 modules transformed.
✓ built in 8.47s
exit 0

The final frontend run retains the repository's pre-existing MSW/ref/act warnings, and the build retains the pre-existing large-chunk warning. No test, typecheck, or build failures remain.

Stale-bootstrap, lifecycle-lock, and competing-Resume hardening

Date: 2026-07-15 Base: 08b1f4909e8eb7538156cecc2e7a6cafb46ddfc7

This follow-up closes asynchronous identity/order and multi-client transport gaps found in the pre-deployment review:

• PiProcessManager.teardownIfCurrent(id, runtime) makes teardown an identity-checked operation. Bootstrap re-checks identity after configuration/retrieval and before both the public Starting model event and model start. Its failure continuation acquires the same session lifecycle lock, claims only its own runtime identity, and holds serialization through persisted failure and the public terminal sequence. A continuation left behind by Close or DELETE cannot target a replacement or recreate forgotten SSE state.
• The former Resume-only promise tail is now a per-session lifecycle lock shared by Resume, Close, and DELETE. Each route reads the current runtime inside the lock immediately before replacement or removal and uses identity-checked teardown. Deferred route tests prove both orderings: Resume then Close/Delete finishes removed with no post-removal bootstrap event; Close then Resume creates only after Close completes; DELETE then Resume cannot recreate a deleted session.
• AppShell assigns each Resume invocation a monotonic token and records the latest target. A completion for a different, superseding session id cannot reset the store, select a source, close the panel, or repaint phase from a late manifest. Same-id invocations are per-target single-flight operations through the POST and local binding commit: repeated pre-commit clicks update the shared operation's latest token but issue no second POST or commit path. The operation becomes joinable again before its manifest fetch, whose repaint remains token/id/selection guarded. Start new, Stop, streamed session exit, and active-session deletion invalidate pending Resume work. This prevents stale-source preservation and reverse/non-Resume intent overwrite without allowing a slow manifest to suppress a later explicit rebind.
• SseHub subscriber registrations now carry idempotent transport-close callbacks. clear and forget snapshot and actively close every response before discarding runtime transport state; callback-driven unsubscription during that iteration is safe. The SSE route ends its response so native EventSource reconnects with Last-Event-ID. Post-clear events retain monotonic ids and are buffered for replay; forget additionally resets the id state.

Production files:

• backend/src/pi/pi-process-manager.ts
• backend/src/routes/sessions.ts
• backend/src/sse/sse-hub.ts
• frontend/src/shell/AppShell.tsx

Regression tests:

• backend/test/pi-process-manager.test.ts
• backend/test/routes-sessions.test.ts
• backend/test/sse-hub.test.ts
• backend/test/sse-route.test.ts
• frontend/src/shell/AppShell.session-mgmt.test.tsx

TDD RED/GREEN evidence

Runtime identity API RED:

cd backend && npx vitest run test/pi-process-manager.test.ts -t "identity-checked teardown"

Test Files  1 failed (1)
Tests       1 failed | 39 skipped (40)
TypeError: mgr.teardownIfCurrent is not a function

Runtime identity API GREEN:

Test Files  1 passed (1)
Tests       1 passed | 39 skipped (40)

Deferred bootstrap RED:

cd backend && npx vitest run test/routes-sessions.test.ts \
  -t "stale bootstrap|bootstrap that"

Test Files  1 failed (1)
Tests       6 failed | 35 skipped (41)

close/delete + replacement: stale continuation removed the replacement runtime
delete without replacement: stale continuation called failSession after forget

Deferred bootstrap GREEN:

Test Files  1 passed (1)
Tests       6 passed | 35 skipped (41)

Shared lifecycle ordering RED:

cd backend && npx vitest run test/routes-sessions.test.ts \
  -t "Resume followed|Close followed|Delete followed"

Test Files  1 failed (1)
Tests       4 failed | 41 skipped (45)

All four deferred assertions observed the competing route settle before the first lifecycle
operation released.

Bootstrap plus lifecycle GREEN:

cd backend && npx vitest run test/routes-sessions.test.ts \
  -t "Resume followed|Close followed|Delete followed|stale bootstrap|bootstrap that"

Test Files  1 passed (1)
Tests       10 passed | 35 skipped (45)

Competing frontend Resume RED:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  -t "competing Resume|stale Resume manifest"

Test Files  1 failed (1)
Tests       2 failed | 16 skipped (18)

reverse POST completion opened a second, stale EventSource
late s1 manifest repainted the selected s3 phase from F3 to F7

Competing and same-id Resume GREEN:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  -t "competing Resume|stale Resume manifest|false then true"

Test Files  1 passed (1)
Tests       3 passed | 15 skipped (18)

Independent-review hardening RED/GREEN

The first final review reported no Critical findings and three Important edge cases: bootstrap could start during an in-progress Close; bootstrap-owned failure was persisted twice; and an older same-id result could overwrite newer state. The integrated reviewer also required non-Resume navigation to invalidate pending Resume work. The final main review tightened the same-ID contract to true single-flight so a second same-target click cannot preserve a dead pre-restart source.

Backend review RED:

cd backend && npx vitest run test/routes-sessions.test.ts \
  -t "Close suppresses|bootstrap failure persists once"

Test Files  1 failed (1)
Tests       2 failed | 45 skipped (47)

deferred configure started Pi while closeSession was still pending
bootstrap/public failure called failSession twice

Backend review GREEN:

Test Files  1 passed (1)
Tests       2 passed | 45 skipped (47)

Same-id single-flight RED:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  -t "share one cold request"

Test Files  1 failed (1)
Tests       1 failed | 18 skipped (19)

two concurrent same-ID invocations issued two cold POSTs (three total including initial activation)

Non-Resume invalidation RED:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  -t "starting a new question invalidates"

Test Files  1 failed (1)
Tests       1 failed | 19 skipped (20)

the late Resume opened an EventSource after Start new returned to the landing state

Frontend review GREEN:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  -t "share one cold request|competing Resume|stale Resume manifest|starting a new question invalidates"

Test Files  1 passed (1)
Tests       4 passed | 15 skipped (19)

Post-commit single-flight lifetime RED:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  -t "releases same-id single-flight"

Test Files  1 failed (1)
Tests       1 failed | 19 skipped (20)

s1 committed and waited on its manifest; after s3 superseded it, a new s1 Resume reused the old
operation and issued no second s1 POST (expected 2, received 1).

Same-id and manifest lifetime GREEN:

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx -t "same-id|manifest"
Test Files  1 passed (1)
Tests       4 passed | 16 skipped (20)

cd frontend && npx tsc -b
no output, exit 0

Multi-client SSE disconnect RED:

cd backend && npx vitest run test/sse-hub.test.ts test/sse-route.test.ts

Test Files  2 failed (2)
Tests       3 failed | 6 passed (9)

clear/forget invoked zero of two registered close callbacks, and two live HTTP SSE responses timed
out instead of reaching EOF after clear.

Multi-client SSE disconnect GREEN:

cd backend && npx vitest run test/sse-hub.test.ts test/sse-route.test.ts
Test Files  2 passed (2)
Tests       9 passed (9)

cd backend && npx tsc --noEmit -p .
no output, exit 0

The Hub tests use two subscribers whose close callbacks immediately unsubscribe themselves, proving safe snapshot iteration and exactly-once closure. The live-route test opens two HTTP streams, proves both receive EOF on clear, publishes a new event and gate, then reconnects after id 1 and replays exactly ids 2 and 3. The forget test closes both subscribers and proves the next id resets to 1.

Close now removes the observed runtime identity before awaiting persistence. Failure persistence is claimed once per runtime and lifecycle-serialized; bootstrap's public session_failed cannot start a duplicate. A per-target in-flight map owns the only same-ID POST and commit while its mutable latest token keeps s1→s2→s1 ordering correct; it is removed immediately after the binding commit, before awaiting the independently guarded manifest. One shared invalidation helper is called when active deletion, streamed exit, Start new, or Stop begins.

Focused verification

cd backend && npx vitest run test/routes-sessions.test.ts test/pi-process-manager.test.ts \
  test/sse-hub.test.ts test/sse-route.test.ts
Test Files  4 passed (4)
Tests       96 passed (96)

cd backend && npx tsc --noEmit -p .
no output, exit 0

cd frontend && npx vitest run src/shell/AppShell.session-mgmt.test.tsx \
  src/shell/AppShell.new-session.test.tsx src/stream/useSessionStream.test.tsx
Test Files  3 passed (3)
Tests       36 passed (36)

cd frontend && npx tsc -b
no output, exit 0

Full verification

cd backend && npx vitest run
Test Files  22 passed (22)
Tests       202 passed (202)

cd frontend && npx vitest run
Test Files  43 passed (43)
Tests       280 passed (280)

cd backend && npm run build
> tsc -p tsconfig.json
exit 0

cd frontend && npm run build
> tsc -b && vite build
✓ 4835 modules transformed.
✓ built in 8.47s
exit 0

The frontend suite/build retain the previously documented MSW, React ref/act, experimental type stripping, and large-chunk warnings. No warning class was introduced by this wave. No harness, workflow, persistence, SQL/CTE viewer, model-selection, or deployment file changed. The four pre-existing modified .superpowers/sdd/{progress,task-2-report,task-3-report,task-4-report}.md files remain excluded from staging.

Final independent-review verdict

After the multi-client transport fix, the independent reviewer reported no Critical, Important, or Minor findings. Its own focused verification passed 96 backend transport/lifecycle tests, 31 frontend Resume/stream tests, both TypeScript checks, and git diff --check. Final assessment: Ready to deploy: Yes.