Fix documentation inconsistencies and bump document versions

CHANGELOG.md

@@ -0,0 +1,79 @@
+# Changelog
+
+All notable changes to this documentation repository, grouped by version and release date.
+Document versions of the individual guideline files are tracked separately in their headers.
+
+## 0.4.0 — 2026-08-18
+
+### Added
+- Skill versioning: every `SKILL.md` now carries `metadata.version` — `changelog` v2, `check` v1,
+  `commit` v2, `documentation` v1, `documentation_context` v2. The skill format has no top-level
+  `version` field; `metadata` is one of the six Agent Skills spec fields, so the frontmatter still
+  packages and uploads cleanly
+- "Skills" section in `README.md` describing the versioning convention, the install location
+  (`~/.claude/skills/`) and the rule that the folder name — not `name:` — is the command
+- The five skills listed individually in the `README.md` structure tree
+- `AGENTS.md` v5 → v6: new "Commit messages" subsection under Git — commits and pull requests must
+  never carry AI authorship (`Co-Authored-By`, "Generated with …", tool signatures or emoji footers).
+  The subsection also states the single-line verbal English style, so assistants without the `commit`
+  skill get the same rules; the AI-authorship rule was added to the skill as well
+- `CHANGELOG.md` for this repository, with history backfilled from the git log
+- Explicit line length for Rust: 100 characters (rustfmt default `max_width`) in both Rust design documents
+- `README.md`, `docs/`, `prebuild.py` and the PyInstaller `.spec` to the template structure in `Python/TEMPLATE.md`
+- Note in `Python/TEMPLATE.md` that `AGENTS.md` and `DESIGN_DOCUMENT.md` are not part of the template
+- `README.md` to the session read list in `Claude/CLAUDE.md`, plus a missing top-level heading
+
+### Changed
+- Document versions bumped for the structural changes released on 2026-08-18:
+  `DESIGN_DOCUMENT.md` v8 → v9, `DESIGN_DOCUMENT_MODULE.md` v1 → v2,
+  `Rust/DESIGN_DOCUMENT.md` v1 → v2, `Rust/DESIGN_DOCUMENT_LIB.md` v1 → v2,
+  `DESIGN_DOCUMENT_GODOT.md` v1 → v2
+- `Project template/CHANGELOG.md` now names the project manifest generically
+  (`pyproject.toml`, `Cargo.toml`, `project.godot`) instead of `pyproject.toml` only
+- Godot debug constant renamed `Constants.DEBUG` → `Constants.DEFAULT_DEBUG`, matching the Python reference module
+- `README.md` step 1 of "Starting a new project" now also requires writing a `README.md`
+- `Python/TEMPLATE.md` entry point is named by purpose or tool name instead of `main.py`
+- `prebuild.py` loads `.env` before importing `src.constants` instead of relying on the import side effect
+
+### Fixed
+- Skill folder `Claude/skills/context/` renamed to `documentation_context/`, with the frontmatter
+  `name` matched to it. The folder name is what Claude Code turns into the command, so the old
+  mismatch meant installing from this repository would have changed `/documentation_context`
+  into `/context`
+- Removed the misplaced lock-file rule from the Testing sections of `DESIGN_DOCUMENT_MODULE.md` (§9)
+  and `Rust/DESIGN_DOCUMENT_LIB.md` (§8) — it already belongs to the Poetry / Distribution sections
+
+## 0.3.0 — 2026-08-18
+
+### Added
+- `Zscaler/ZSCALER_CERTIFICATE.md` — full certificate setup for Node, Python, git and cargo
+- Language-specific `.gitignore` files for Python, Rust and Godot, plus a shared core in `Project template/`
+- `poetry.lock` and `prebuild.py` sections in `Python/DESIGN_DOCUMENT.md`
+
+### Changed
+- Unified task notation across all languages on the Todo Tree tags `TODO`, `FIXME`, `BUG`, `HACK`, `NOTE`
+- `AGENTS.md` v4 → v5: rewritten as strictly language-agnostic, naming no concrete tool
+- Python line length 150 → 120 characters
+- Rust edition 2021 → 2024 (requires Rust 1.85 or newer)
+- Godot project version key corrected to `application/config/version`
+- Every design document now lists `README.md` among the core root documents
+
+### Removed
+- `Zscaler/NODE_EXTRA_CA_CERTS.md`, superseded by `ZSCALER_CERTIFICATE.md`
+
+## 0.2.0 — 2026-06-24
+
+### Added
+- `Godot/DESIGN_DOCUMENT_GODOT.md` — Godot development guidelines (v1)
+
+## 0.1.0 — 2026-05-25
+
+### Added
+- `Rust/DESIGN_DOCUMENT.md` and `Rust/DESIGN_DOCUMENT_LIB.md` — Rust guidelines for applications and libraries (v1)
+- `Claude/` — `CLAUDE.md`, `AGENTS.md` (v4) and the custom skills `changelog`, `check`, `commit`, `context`, `documentation`
+- `Python/` — `DESIGN_DOCUMENT.md` (v8), `DESIGN_DOCUMENT_MODULE.md` (v1), `TEMPLATE.md`, and the reference `constants.py` module with tests
+- `Project template/` — `PROJECT.md` and `CHANGELOG.md` templates
+
+### Changed
+- Documentation organised into topic folders: `Claude/`, `Python/`, `Zscaler/`, `Project template/`
+- `README.md` rewritten to describe the repository itself instead of a single project