chore: complete v1.0 milestone

Archive v1.0 MVP: 7 phases, 13 plans, 27/27 requirements.

- Archive roadmap to milestones/v1.0-ROADMAP.md
- Archive requirements to milestones/v1.0-REQUIREMENTS.md
- Move milestone audit into milestones/
- Create MILESTONES.md with v1.0 entry
- Evolve PROJECT.md: move shipped requirements to Validated,
  update Context with stack/LOC, log Key Decisions with outcomes
- Collapse ROADMAP.md to one-line milestone summary
- Update STATE.md to shipped status
- Back-fill stale requirements-completed frontmatter on
  02-01, 04-01, 05-01, 06-01 SUMMARY.md files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_driver_upload.py

@@ -121,7 +121,7 @@ def test_driver_persisted(client: TestClient, tmp_data_dir) -> None:
     count = Driver.select().where(Driver.sha256 == expected_sha).count()
     assert count == 1
 
-    driver_file = tmp_data_dir / "drivers" / expected_sha
+    driver_file = tmp_data_dir / "drivers" / f"{expected_sha}.zip"
     assert driver_file.exists()