docs: add M15 (Documentation) to CHANGELOG 0.1.0 entry

Add HANDOFF.md to .gitignore for session handoff notes.
Delete 12 temporary files (FIXME_M1-M10, FEAT_M9, TEST_REPORT).

.gitignore

@@ -54,6 +54,7 @@ Thumbs.db
 FIXME_*
 FEAT_*
 TEST_*
+HANDOFF.md
 .worktrees/
 
 # --- Logs ---

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.1.0] - 2026-09-08
 
-Initial release covering milestones M1 through M14.
+Initial release covering milestones M1 through M15.
 
 ### Added
 - **M1 (Scaffolding)**: Python project structure with `pyproject.toml`, and tooling configuration for `ruff`, `mypy`, `bandit`, and `pre-commit`.
@@ -24,4 +24,5 @@ Initial release covering milestones M1 through M14.
 - **M12 (CLI entry point)**: `pronote-sync` command with `--dry-run` and `--log-level` options, redacted error display, and safe traceback in DEBUG mode.
 - **M13 (Tests & coverage)**: 636 tests with 95.67% coverage, test fixtures (`pronote-4e.ics`, `pronote-6e.ics`), shared `conftest.py`, and secret non-leak tests.
 - **M14 (Deployment)**: systemd service and timer (daily at 18:00), logrotate configuration (daily, rotate 7, compress), `check_secrets.py` pre-deployment scanner, and exploitation guide.
+- **M15 (Documentation)**: README, README.LLM.md (AI agent setup guide), MIT LICENSE, CHANGELOG, and Gitea Actions CI/CD reference for LXC/VPS (Debian/CentOS).
 - **Other**: MIT License. Gitea Actions CI/CD reference for LXC/VPS (Debian/CentOS) is planned and optional, not delivered in this release.