clean-house: fix 37 stale DQR cross-links; sort architecture.md decisions

clean-house sweep over governance/ (validate green, 0 broken refs before
and after):

- RULE-ANCHOR-DRIFT (37): rewrote inline cross-reference links left over
  from before the decisions/questions/rejected subdir split — flat naming
  (questions-architecture.md, questions-process.md, rejected.md) and bare
  same-dir paths that were actually cross-type — to canonical
  subdir-relative form with current slugs. pql resolved these by ID so they
  were never broken to the tooling, only to GitHub anchor navigation.
- RULE-RECORD-SORT (1): reordered decisions/architecture.md D-records to
  strictly ascending (the D-1..D-6 block had been appended after D-41); pure
  block move, line count unchanged, content identical.
- RULE-FILE-OVER-THRESHOLD: deferred (architecture.md 435 > 350; splitting
  would re-churn the anchors just fixed).
- EOF/whitespace and Q↔D backlinks clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

governance/questions/testing.md

@@ -10,7 +10,7 @@
 
 ### Q-12: Screen-reader automation (axe-core via Playwright)
 - **Status:** Open
-- **Question:** [D-22](accessibility.md#d-22-wcag-aa-contrast-gate-on-bundled-themes) gates contrast at build time. Do we also run axe-core against the WASM build in Playwright for runtime a11y issues (missing labels, invalid roles, orphan focusables)?
+- **Question:** [D-22](../decisions/accessibility.md#d-22-wcag-aa-contrast-gate-on-bundled-themes) gates contrast at build time. Do we also run axe-core against the WASM build in Playwright for runtime a11y issues (missing labels, invalid roles, orphan focusables)?
 - **Context:** axe-core is JS; runs in the browser against the rendered tree. Extra CI time; extra signal.
 - **Source:** 2026-04-21 planning.