ADR-1703 Phase 7 / epic #1702 closeout. The mechanical teardown is already
complete across phases 1-6 (regex scanner retired P3, ratchet deleted P4,
allowlist portability-usage gone, windows-portability-ok comments swept,
every DEFECT.WINDOWS-* predicate rewritten per-phase). This phase delivers the
two remaining ADR-mandated closeout items:
- docs/contributing/adding-a-portability-rule.md: the forward architecture
recipe (Diátaxis Explanation) — the five seams (rule / portability-vocab /
platform-guard / disable-ban / ci-test-scope), the zero-escape-hatch contract,
the shipped-rule catalog, and the step-by-step checklist for adding a new
local/* portability rule.
- docs/adr/1703: Status Proposed -> Accepted (all seven phases shipped); a
Phase 7 as-built note recording the two deviations from the Phase 0 catalog —
Phase 6's rename-only scope decision (#1740) and the codex-review precision
tightening on require-fs-op-fallback.
- docs/contributing/cross-platform-portability-rules.md: cross-link to the new
guide from the rule reference.
No code, no test, no runtime change. Epic #1702 Phase 6 box checked; Phase 7
box + epic closure to follow at PR merge.
Closes#1744
Co-authored-by: review-bot <review-bot@gsd>
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