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-vram-model-prefix-match/CODE_REVIEW.md

@@ -0,0 +1,21 @@
+# Code Review: fix-vram-model-prefix-match
+
+## Reviewed Files
+- `scripts/vram_detect.py` (`_lookup_model_context()`, `_KNOWN_MODEL_SUFFIXES`)
+
+## Changes
+Replaced raw `startswith()` with three-tier matching: exact match, `:` separator (Ollama tags), and `-` separator with known instruction-tuning suffix whitelist.
+
+## Analysis
+- **Correctness**: The three-tier approach correctly handles all test cases:
+  - `deepseek-r1:7b` matches via `:` separator ✓
+  - `llama-3.1-8b-instruct` matches via `-` + `instruct` suffix ✓
+  - `phi-4-mini-instruct` rejected (`mini` not in suffixes) ✓
+  - `gpt-4o-foo-unknown` rejected (`foo` not in suffixes) ✓
+  - `phi-40` rejected (no separator) ✓
+- **Edge cases**: `gpt-4-turbo` is in the dict directly, so it matches via exact match (checked before `gpt-4` due to length-descending sort)
+- **Maintainability**: The suffix whitelist is explicit and easy to extend
+
+## Verdict: PASS
+
+The fix is well-structured, handles all edge cases correctly, and is properly tested.