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168 records -> docs/decisions/records/<area>/<topic>.md (163 active, 23 dirs) and docs/decisions/archive/<area>/<topic>.md (5 archived). The filename IS the key, so one-active-record-per-key becomes a filesystem property rather than a validator check, and supersession becomes a `git mv`. WHY: the monolith was a concurrency problem before an aesthetic one. A 3,900-line append target made parallel sessions collide -- PR #605 and PR #614 both hit append-vs-append conflicts during routine rebases, and hand-resolving those inside the corpus is exactly the operation the rationale-rewrite guard exists to police. HOW IT IS VERIFIED: a ~170-file diff cannot be meaningfully read, so correctness does not rest on reading it. The parser was taught BOTH formats first, so the body-diff guard parses the old form at the merge-base and the new form at head -- the migration validates itself, no bypass. The proof is a field-level equivalence harness: 168 records before and after, zero lost, zero gained, zero field mismatches, zero rationale bodies differing. Reviewers should scrutinise the harness; it is the actual evidence. What measuring caught that reading would not have: - ~500 lines sit OUTSIDE any record -- decisions.md's lifecycle schema and each topic file's preamble, mostly the only copy. Source files are kept and stripped, never deleted. They also cannot be filed per-area: topic files hold several areas and 4 of 23 areas span several files. - Archive discovery was a non-recursive glob; after the split it found ZERO archived records, surfacing as four bogus "supersedes points to unknown key" errors rather than an obvious failure. - ~32 live docs point into the corpus BY DATE, which the split dangles. Each stripped file now ends with a generated "Records formerly in this file" index, which also rescues the identical breadcrumbs in old issue comments. - decisions.md's "In this file:" list was 97 same-file anchor bullets that the split makes WRONG, not merely stale. Dropped; the generated index replaces them with links that resolve. The equivalence harness now runs against a checked-in FIXTURE, not the live corpus. The earlier version migrated the real tree, which made it a one-shot: the moment the migration landed there was nothing left to move and the tests failed for reasons unrelated to the code. A fixture keeps them testing the SCRIPT rather than the repo's current state. Keys preserved verbatim, warts included: `sched` (12) and `scheduling` (1) remain two directories for one concept. Renaming a key is not a move -- it changes identity, breaks the equivalence proof, and invalidates MemPalace's per-key drawers. Taxonomy normalisation is separate work. refs #610
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key, title, status, since, supersedes, superseded-by, rule, signals, mechanics
| key | title | status | since | supersedes | superseded-by | rule | signals | mechanics |
|---|---|---|---|---|---|---|---|---|
| ci.docs-only-detect-shallow-safe | 2026-07-17 — Docs-only detect must be shallow-checkout safe: FETCH_HEAD + two-dot, not origin/main + three-dot (#416 follow-up) | active | 2026-07-17 | none | none | The docs-only detect script must diff against `FETCH_HEAD` (always resolves after `git fetch`, even shallow) using a two-dot tree diff — not `origin/<base>` with three-dot — because a `fetch-depth: 1` shallow clone has no remote-tracking ref and no merge-base, which silently fails the original detect into `docs_only=false` (full matrix, no functional error). A CI-behavior change must be verified by measuring the effect (job durations), not just a green check. | shallow clone, FETCH_HEAD, two-dot vs three-dot diff, fetch-depth 1 · paths: `scripts/ci-detect-docs-only.sh` · issues: #416, #422 | `docs/ci-cd.md` → "Docs-only skip"; verified via a real shallow `file://` clone reproduction |
The #416 docs-only skip shipped (#422) safe but ineffective: every docs-only PR still ran the full
matrix. Root cause — test/migrations check out fetch-depth: 1, and in a shallow clone
origin/<base> has no remote-tracking ref and there is no merge-base, so the detect script's
three-dot git diff origin/main...HEAD errored → || true → empty diff → the fail-safe returned
docs_only=false → full matrix. Confirmed in a real shallow file:// clone (origin/main did not
resolve; three-dot errored; git diff FETCH_HEAD HEAD returned the changed files correctly).
Decision: the detect diffs against FETCH_HEAD (always written by git fetch, resolves in a
shallow clone) with a two-dot tree diff (no merge-base). api-docs/format were unaffected only
because they use fetch-depth: 0 — a difference the first cut missed. Meta-lesson reinforced: a CI
gating change can pass every local test and merge green while being a complete no-op in CI; only
real-PR verification that measures the effect (job durations, not just a green check) catches it —
which is exactly what #416's Done-when demanded. Fixed in the #416 follow-up PR.