Fixes 3 substring-truncated cross-reference anchors so they match
the full heading slug:
- D-3 link in architecture.md
- D-40 link in process.md (heading gained the [SUPERSEDED] tag)
- Q-15 link in questions-process.md
Strips the legacy `app/` prefix from path references in 5 files —
the dirs were flattened to repo root in the Flutter rebuild
(D-56). Three "was `app/...`" historical references in D-5 and
D-56 are deliberately preserved as record of the dissolution.
Adds an inline (tracked in T-88) note to D-59 so the
"must track dugite-native releases for security updates" intent
is wired to a backlog item — RULE-SUNSET-WITHOUT-TICKET would
otherwise keep flagging it on every sweep.
Co-Authored-By: Claude <noreply@anthropic.com>