feat(replay): fixtures + augment script for v2 artifact-gate viewers

Add cte-plan-fixture.json, cte-result-fixture.json, and
phase-summary-fixture.json — realistic Italian-language payloads for the
cardiology DWH replay session, conforming exactly to contracts.md (A/B/C).

Add augment-review-gates.mjs (pattern of augment-schema-linking.mjs): finds
the F6 cte_plan gate, first CTE 1 cte_result gate, and Fase 5 phase-summary
gate by title regex and swaps in the v2 artifact.data, so CtePlanViewer,
CteResultViewer, and PhaseSummaryViewer render in the offline replay.
Idempotent; exits 1 if an expected gate is missing.

Document the augment scripts and re-extract note in tools/replay/README.md.

tools/replay/README.md

@@ -109,7 +109,17 @@ I 20 gate della sessione 17:07: 4 `select` + 11 `confirm` + 5 `decide`.
 ## File
 
 - `extract.mjs` — estrattore fixture dal transcript Pi JSONL.
+- `augment-schema-linking.mjs` — riscrive il gate F4 tabelle/colonne come
+  descrittore `schema-linking` (vedi `schema-linking-fixture.json`).
+- `augment-review-gates.mjs` — riscrive i gate F6 piano CTE, CTE 1 approvato e
+  Fase 5 completata come descrittori v2 (`cte_plan`/`cte_result`/`phase`, vedi
+  `cte-plan-fixture.json`, `cte-result-fixture.json`,
+  `phase-summary-fixture.json`). **Nota:** questi tre gate sono ancora
+  fixture sintetiche coerenti coi contratti v2 — dopo la prima sessione live
+  che passa per un gate `cte_plan`/`cte_result`/`phase` reale, rilancia
+  `extract.mjs` per catturare i descrittori v2 reali e sostituire le fixture.
 - `server.mjs` — server HTTP+SSE standalone (node:http, zero deps).
-- `replay.json` — fixture generata (committata per comodità).
+- `replay.json` — fixture generata (committata per comodità; rigenerata con
+  `augment-schema-linking.mjs` poi `augment-review-gates.mjs`, in quest'ordine).
 - `web/` — bundle SPA costruito da `frontend/` con
   `VITE_BACKEND_URL=http://localhost:5333` (gitignorato; prodotto da `build`).