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-can-edit-path-prefix/ADVERSARIAL_BUG_REPORT.md

@@ -0,0 +1,19 @@
+# Adversarial Bug Report: fix-can-edit-path-prefix
+
+## Summary
+Adversarial review of the path prefix fix. No additional bugs found.
+
+## Bugs Found
+No bugs found.
+
+## Analysis
+- **Security — symlink bypass**: `Path(args.file).resolve()` resolves symlinks before comparison, so a symlink inside the project pointing outside would be resolved to the real path and correctly rejected. Good.
+- **Trailing slash**: The `== proj_str` clause handles the edge case where `file_path` is exactly the project directory. `Path.resolve()` strips trailing slashes, so this is robust.
+- **Case sensitivity**: On macOS (default filesystem is case-insensitive), `Path.resolve()` does not normalize case. A file at `/Users/user/Project/file.py` would not match project `/Users/user/project`. This is consistent with the original behavior and not a regression.
+- **Framework vs project**: The fix applies `os.sep` to both `proj_str` and `auto_str` checks — consistent across all 5 locations.
+- **Empty file path**: `args.file` is required by argparse for `--can-edit --file` and `--scope-check`, so empty paths are not reachable.
+
+## Score
+0
+
+ADVERSARIAL_BUG_FIND_COMPLETE