Rework .agents/, Claude/Codex config, CI workflows, lint gates and
lint-rule tests, and the release/changelog tooling. The 5% comment
density gate stays diff-scoped inside git hooks, where GIT_DIR outranks
the -C the gate uses to locate the repository. The tray icon generator
writes multi-size ICO files from the SVG sources into the per-platform
tray asset directories. The custom code-review subagents are gone: the
built-in /code-review never dispatched them, and the subagent model now
lives in a user-level setting outside the repository.
The Makefile, build_config.yaml and CI hand the Core and Helper builds to
the setup build hook, so the buildkit launchers go, and setup.dart
packages AppImage and rpm on arm64 with flutter_distributor pinned to the
fork tag that normalizes packaging permissions.
Changelog: skip
chen08209