Fix 10 audit bugs: path prefix matching, verdict parsing, CORS, stale-task detection, phase mapping

Batch 1 (High severity):
- Bug 1: --audit cat3 now checks .automaton/tasks/ paths
- Bug 4: Verdict PASS/FAIL uses structured ## Status: line parsing
- Bug 5: register-guards.sh checks .json/.jsonc, writes plugin key, strips comments
- Bug 7: --can-edit/--scope-check path prefix uses os.sep boundary

Batch 2 (Medium/Low severity):
- Bug 2: migrate-project.sh find command parentheses for -prune binding
- Bug 3: vram_detect model prefix matching with known-suffix whitelist
- Bug 6: dashboard reads .state file before artifact heuristic fallback
- Bug 8: removed wildcard CORS, added security headers (nosniff, DENY)
- Bug 9: stale-task detection uses .state.lastedit instead of .state mtime
- Bug 10: TEST_PLAN.md maps to test_design (was implement)

249 tests pass (up from 235). All 10 tasks driven through full workflow to completion.

tasks/fix-migrate-find-precedence/CODE_REVIEW.md

@@ -0,0 +1,13 @@
+# Code Review: fix-migrate-find-precedence
+
+## Reviewed Files
+- `scripts/migrate-project.sh` (line 108)
+
+## Changes
+Added parentheses around `-name` tests in `find` command to ensure `-prune` binds to the entire OR-group.
+
+## Verdict: PASS
+
+The fix is correct and minimal. In POSIX `find`, `-a` (AND) has higher precedence than `-o` (OR), so without parentheses, `-prune` only applies to the last `-name` test. The parentheses ensure `-prune` applies to all three directories (`.git`, `node_modules`, `.automaton`).
+
+Verified with `bash -n scripts/migrate-project.sh` — syntax is valid.