docs(skill): Phase 4 uses reviewer_schema_linking; honor curated output columns

harness/.pi/skills/tht-sessione/SKILL.md

@@ -37,7 +37,7 @@ substantive decisions.
 | F1 chiarimento | — | `reviewer_confirm kind:"phase"` |
 | F2 memoria | — | `advance:true` only if nothing recorded; else `reviewer_confirm kind:"phase"` |
 | F3 riscrittura | `question.md` | `reviewer_confirm kind:"phase"` (after `rewrite_question`) |
-| F4 schema_linking | `schema_linking.json` | `reviewer_confirm kind:"phase"` (after `write_schema_linking`) |
+| F4 schema_linking | `schema_linking.json` | `reviewer_confirm kind:"phase"` (after `reviewer_schema_linking` + `write_schema_linking`). Promoted columns are the reviewer-approved OUTPUT columns — project exactly those in the final SELECT. |
 | F5 sintesi | — | `reviewer_confirm kind:"phase"` (after `tht session check`) |
 | F6 cte | `cte_plan.json`, `ctes/`, `cte_tests.json` | approve each CTE `kind:"cte_result"`, then `reviewer_confirm kind:"phase"` |
 | F7 sql_finale | `sql_final.sql` | `kind:"sql"` records `sql_approved`, then `reviewer_confirm kind:"phase"` |
@@ -208,8 +208,20 @@ Prerequisite: Phase 3 closed.
 
 1. `tht schema introspect` + `tht schema render --format mschema-text` for the schema
    context. Copy table/column names EXACTLY from it — never invent objects.
-2. Propose tables/columns/joins in `reviewer_decide(advance:false)`. Register
-   `table_promoted`/`table_excluded`/`column_corrected`/`join_modified`.
+2. Propose tables to promote/exclude with **`reviewer_schema_linking`**: pass
+   `tables[]` as `{id, name, kind: "promote"|"exclude", rationale, suggested_columns}`.
+   Do NOT list every column yourself — the gate loads the full column set (with
+   descriptions) from the catalog and pre-selects your `suggested_columns`. The
+   reviewer curates the columns per promoted table. The tool records
+   `table_promoted`/`table_excluded` + `column_promoted`/`column_excluded` and
+   re-projects `schema_linking.json` deterministically via `tht session
+   sync-schema-linking` (you do NOT hand-write the tables/columns part with
+   `write_schema_linking`). The promoted columns are the reviewer-approved OUTPUT
+   columns: project exactly those in the final SELECT (Phase 6/7); you remain free
+   to reference other columns as join keys or filter predicates when the query
+   requires them.
+   Propose joins separately in `reviewer_decide(advance:false)`, registering
+   `join_modified`.
 3. **Value grounding (D14a).** If a cited value (e.g. "ablazione") matches MULTIPLE
    columns (a boolean flag + a free-text patologia field), present a `reviewer_decide`
    with a `value_grounded` option for each candidate column (the LSH exposes all of
@@ -219,13 +231,16 @@ Prerequisite: Phase 3 closed.
    "<concept>"` (or derive it from the evidence/context), present it, and let the
    reviewer approve/reject (`concept_formula_approved`/`concept_formula_rejected`).
    Reflect the approved formula in `schema_linking.json` (`concept_formulas`).
-5. Persist `schema_linking.json` with the gate's `write_schema_linking` tool — it validates
-   the object against the `SchemaLinking` model and writes the file deterministically (never
-   hand-write it, never edit it with the file tool; on a validation error the tool returns the
-   exact problem to fix). Shape: `{question, candidates:[{kind:"table"|"column", name,
-   evidence?, decision?:"promoted"|"excluded"|"pending"}], joins:[{from, to, source?}],
-   excluded:[{kind, name}], open_questions:[], concept_formulas:[]}`. Then close with
-   `reviewer_confirm kind:"phase"`. Do NOT run `tht session check` (that's Phase 5).
+5. Persist the **joins** (and any `concept_formulas`/`open_questions`) with the gate's
+   `write_schema_linking` tool — it validates the object against the `SchemaLinking`
+   model and writes the file deterministically (never hand-write it, never edit it
+   with the file tool; on a validation error the tool returns the exact problem to
+   fix). Shape: `{question, candidates:[...], joins:[{from, to, source?}],
+   excluded:[...], open_questions:[], concept_formulas:[]}` — `candidates`/`excluded`
+   are owned by `reviewer_schema_linking`/`sync-schema-linking` (step 2), so if you
+   call `write_schema_linking` after step 2, carry over its `candidates`/`excluded`
+   unchanged rather than overwriting them. Then close with `reviewer_confirm
+   kind:"phase"`. Do NOT run `tht session check` (that's Phase 5).
 
 ## Phase 5 — Synthesis
 
@@ -261,6 +276,10 @@ Prerequisite: Phase 6 closed.
 1. Read `sql-generation.md`. Recursive divide-and-conquer: the CTEs approved in
    Phase 6 are the preferred building blocks (reuse them by name).
 2. Compose the final SQL (PostgreSQL dialect, exact names from the schema context).
+   **Output columns (F4 honoring).** The columns promoted in Phase 4's
+   `schema_linking.json` are the reviewer-approved OUTPUT columns: project exactly
+   those in the final SELECT. Other schema-linked columns remain usable as join
+   keys or filter predicates, but do not add them to the SELECT list.
    **Time dimension:** `data_time_key` is the FK to `dim_time.day_key` (NOT declared
    in the DWH, must be added by hand to the join); use `JOIN dim_time` and its
    columns (`dt.year`, `dt.month`, …), NEVER arithmetic on the key.