Workshop Refresh

Follow the canonical allowed/forbidden contract in references/vendored/workshop/workshop-invariants.md § 3 for every inner Design/Estimate run. GCP specifics: Design follows design.md § Inner workshop reprice and Estimate follows estimate.md § Inner workshop reprice (both skip state transitions); phases.design/phases.estimate stay "completed"; current_phase stays "estimate" until workshop-assemble.md.

Baseline capture

When scenarios/ or scenarios/index.json is absent:

1. inventory_fingerprint = SHA-256 hex of gcp-resource-inventory.json bytes.
2. Create scenarios/.
3. Copy working-tree artifacts:
   • scenarios/scenario-001.preferences.json
   • scenarios/scenario-001.aws-design.json
   • scenarios/scenario-001.estimation-infra.json
4. Write scenarios/scenario-001.json (source: "baseline", summary from estimation-infra including three monthly tiers).
5. Write scenarios/index.json (baseline / active = scenario-001, max_scenarios: 5).
6. Ensure preferences.workshop exists: { "active": true, "last_sheet_at": "<now>", "active_scenario_id": "scenario-001" }
7. If baseline-only, return to workshop.md for the sheet.

Apply & reprice

1. Inventory guard

If fingerprint ≠ index.inventory_fingerprint, STOP:

Inventory changed since baseline. Re-run Discover before workshop reprice.

2. Stale Generate guard

If generate completed, require re-entry confirm and reset generate to pending.

3. Patch preferences

Apply sheet edits. Set workshop.active: true, workshop.last_sheet_at now. Leave non-knob fields (including AI/agentic constraints) untouched.

Graviton caveat carry-forward: If the sheet showed a Graviton risk-signal caveat (any graviton_profile entry with tier in {incompatible, conditional, unknown}) and the SA set cpu_architecture to graviton or mixed, set preferences.workshop.graviton_note to a short string naming the counts, e.g. "1 incompatible, 0 conditional — graviton applies where tier: ready". Clear graviton_note when arch is x86 or when no risk-signal tiers exist.

4–5. Inner Design then Estimate

Per Inner runs. Design must follow design.md § Inner workshop reprice (skip handoff / phase-status). Estimate must follow estimate.md § Inner workshop reprice. Chat note after Estimate: “Workshop reprice Estimate complete; returning to workshop loop.”

6. Snapshot

1. Next id scenario-00N.
2. If length would exceed 5, warn and name oldest non-baseline before delete.
3. Copy prefs / design / estimation into scenarios/{id}.*.
4. preferences_subset: differing knob paths vs baseline.
5. Label: summarize the subset; if workshop.graviton_note is set, append (caveat: <graviton_note>) to the scenario label and copy the note into the manifest as graviton_note.
6. When the inner estimate wrote recommendation.outcome (v2 decision fields), copy it into the manifest as estimation_summary.recommendation_outcome; omit/null otherwise — this feeds the compare view’s Outcome column and flip callout.
7. Update index + workshop.active_scenario_id.

7. Hand back

Return to workshop.md → workshop-compare.md.