P8-T1: Release version 0.4.2 to PyPI and MCP Registry

[SoundBlaster]

Description

Bump version to 0.4.2 to release all Phase 5–7 work accumulated since v0.4.1:

• Phase 5: --broker flag, auto-recovery, JSON-RPC -32001 error, web-UI mismatch warning
• Phase 6: broker daemon status surface, TUI terminal frontend
• Phase 7: broker console startup, --doctor diagnostics, port-conflict recovery, TUI local fallback, broker UX docs + quickstart

Changes: pyproject.toml version → 0.4.2, server.json version → 0.4.2 (root + packages[0]), README version badge → v0.4.2.

Post-merge action required: push git tag v0.4.2 && git push origin v0.4.2 to trigger publish-mcp.yml and publish to PyPI + MCP Registry.

See validation report: SPECS/ARCHIVE/P8-T1_Release_version_0.4.2_to_PyPI_and_MCP_Registry/P8-T1_Validation_Report.md

Type of Change

• Bug fix
• New feature
• Documentation update
• Refactoring
• CI/CD improvement

Quality Gates

• make test - All tests pass with ≥90% coverage (898 passed, 91.75% coverage)
• make lint - No linting errors (ruff check src/: all checks passed)
• make format - Code is properly formatted
• make typecheck - Type checking passes (mypy src/: no issues in 20 files)
• make doccheck - N/A (no docs/ changes)

Documentation Sync

• Documentation changes are synced with DocC catalog (or N/A) — README badge only, no DocC mirror needed

Testing

• Added/updated tests for new functionality — N/A (version metadata change only)
• All tests pass locally
• Manually tested the changes — tag push deferred to post-merge

Checklist

• Code follows the project's style guidelines
• Self-review completed
• Comments added for complex code — N/A
• Documentation updated (if needed) — README badge updated
• No new warnings generated
• PR title is descriptive

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