Codifies the lessons from T4 + G5-4 retrospective:
KEEP — earned its keep on T4:
- G-1 V2 PORT read (saved 5 hidden invariants on T4b-4, probe non-
mutation pin on T4c-2, 3 placement decisions on T4d-3)
- Mini-plan acceptance criteria (single source of truth for close)
- Invariant ledger discipline ("claim without test = wish")
- m01 -race verification (caught 2 engine bugs at T4d-4 part C)
- Architect single-sign at close (caught 4 stale refs at G5-4 close)
DROP — overhead without payoff:
- Separate kickoff PROPOSAL doc (mini-plan §1-§6 = same thing)
- Separate G-1 doc (inline §4 of mini-plan)
- Separate closure report doc (§close section of mini-plan)
- Separate forward-carry checklist (§5 of next-batch mini-plan)
- Separate QA scenario catalogue (write tests directly when ready)
- Multi-version doc churn (v0.1→v0.5)
- Cross-doc invariant restatement (ledger is sole source)
- Mixed T-track + G-N naming for same gate
Compressed sign cycles: was 4-5 architect signs per batch; now 2
(scope ratify + close sign).
Per-batch artifact count: was 5+ (kickoff + mini-plan + G-1 +
closure + checklist + scenario catalogue); now 1 (mini-plan with
§close appended).
Decision rules codified:
§6.1 G-1 yes/no (V2 PORT yes; V3-native no)
§6.2 T-track vs G-N naming (architect picks at kickoff)
§6.3 When to skip mini-plan (1-line hotfix-class)
§8 names the 6 first-order control docs to keep current
(v3-dev-roadmap, v3-phase-15-mvp-scope-gates, v3-invariant-ledger,
v3-block-behavior-contract-index, v3-product-placement-authority-
rationale, v2-v3-contract-bridge-catalogue).
§9 first trial: G5-5 m01 hardware first-light.
§11 honesty principle: documentation that catches bugs is
discipline; documentation that doesn't is ceremony. Drop ceremony,
keep discipline.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
pingqiu