Release v0.6.0

[xeonvs]

Summary

• prepare deterministic stable 0.6.0 artifacts and advance the development line to 0.6.1
• publish the M4 changelog, archive the repository-complete execution plan, and return PLANS.md to its template state
• reconcile M4 roadmap, backlog, strategy, and release authorization while keeping stable external delivery explicitly pending

Validation

• full quality gate: 766 tests and 99 subtests, 81.12% branch coverage
• full suite independently on Python 3.12, 3.13, and 3.14
• focused release, distribution, collectors/store, installed policy/MCP, and compatibility contracts
• reproducible stable wheel and sdist, Twine, clean supported-Python installs, hostile-shadow real stdio MCP E2E
• lock/dependency audit, OCR compatibility manifest, workflow YAML, ShellCheck, release-note comparison, privacy scan, and staged/history Gitleaks

Stable TestPyPI/PyPI publication, provenance, attestations, annotated tag, immutable GitHub Release, receipt readback, and issue #81 closure remain post-merge acceptance gates.