fix(ci): address PR review — filter comments, trim whitespace, warn on missing scripts

Address all review comments from Hoshe and Tyre on PR #27:
- Remove 2>/dev/null from pre-pr-fixtures (critical: swallowed errors)
- Remove dead _file_type function
- Check 4: error on districts with no locations declared
- Check 5: print advisory message when skipping
- Check 8: cross-file line ID uniqueness (not just per-file)
- Check 9: document D-034 asymmetric relationships in docstring
- Document regex fallback rationale in _scan_knowledge
- Add D-035 decision trace to schema descriptions
- Use concrete protocol version in DEVOPS.md example
- Amend D-035 with focused (9th mood) and greeting (14th situation)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/DEVOPS.md

@@ -112,7 +112,7 @@ If `pre-pr-fixtures` fails, your protocol changes require fixture regeneration:
 ```bash
 make fixtures
 git add client/tests/fixtures/
-git commit -m "chore(fixtures): regenerate for protocol vN"
+git commit -m "chore(fixtures): regenerate for protocol v8"
 ```
 
 The fixture staleness check is a **blocker** (exit 1) — stale fixtures cause false positive client tests.