release: prepare Zeus v0.5.0

[brainx]

Summary

• set the package and OpenAPI versions to 0.5.0
• move the current unreleased changes, including Kimi K3 support from feat: add Kimi K3 API support #20, into the 0.5.0 changelog section
• document the compatibility-preserving internal module decomposition and 1,200-line production-module size ratchet
• identify v0.5.0 as the latest stable release in the roadmap

Impact

Relative to current main, this PR changes release metadata and hardens two rate-limit test assertions against threaded access-log ordering. Runtime Kimi K3 support is already present through #20; this PR does not change runtime code, public behavior, API/schema migration, lifecycle ordering, or Hermes compatibility.

Release safety

The release tag must be created only after this PR is squash-merged through GitHub and must target that GitHub-verified commit on main. The unsigned topic-branch commits are not valid tag targets. GitHub's immediately preceding squash merge for #20 was independently confirmed as verified: true with verification reason valid.

Verification

• .venv/bin/python scripts/check_version_tag.py v0.5.0 --require-changelog — passed
• make release-check in the repository development environment — passed
  • 1,137 tests passed in the normal run with 3 expected skips
  • 1,137 tests passed under branch coverage with 3 expected skips
  • 82.44% branch coverage
  • repository readiness, Ruff formatting and lint, MyPy, Bandit, ShellCheck, dependency validation, package build, installed-wheel smoke, Twine validation, and checksum generation passed
• Python 3.14 focused rate-limit audit assertions — 40 repeated executions passed
• Ruff format/lint on tests/test_api.py — passed
• git diff --check — passed
• Hosted CI run 30662495244 — all Python 3.11, 3.12, 3.13, and 3.14 tests, package, real-Hermes, macOS lifecycle, and subprocess jobs passed

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