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-cat3-audit-paths/SPEC.md

@@ -0,0 +1,14 @@
+# Spec: fix-cat3-audit-paths
+
+## Problem
+`_audit_category3()` in `scripts/status.py:696` checks if changed files are inside task folders using `parts[0] == "tasks"`. This only works for the framework directory (`~/.automaton/`) where git paths are `tasks/mytask/...`. For regular projects, task files have git paths like `.automaton/tasks/mytask/SPEC.md`, where `parts[0]` is `.automaton`, not `tasks`. All task-folder changes are incorrectly flagged as unauthorized.
+
+## Fix
+Update the path check at `scripts/status.py:696` to handle both cases:
+- Framework mode: `parts[0] == "tasks" and parts[1] in task_names`
+- Regular project: `len(parts) >= 3 and parts[0] == ".automaton" and parts[1] == "tasks" and parts[2] in task_names`
+
+## Acceptance Criteria
+- `--audit` on a regular project with changes inside `.automaton/tasks/` does NOT flag them as unauthorized
+- `--audit` on the framework directory still works correctly
+- Add a test in `tests/test_status.py` covering the regular-project path check