docs: record v0.2.2 release and marketplace evidence

[AlexMikhalev]

Summary

• record the signed v0.2.2 release, immutable-tag protection, and verified release assets
• record real Kimi, Claude Code, Hermes, and skills.sh installation evidence
• link the open ZCode and Grok Build marketplace submissions while keeping external acceptance explicit
• add regression coverage for release evidence, marketplace links, and Community-only entitlement boundaries

Validation

• python3 scripts/generate_distribution.py --check
• python3 -m unittest discover -s tests -p 'test_*.py' — 24 passed
• deterministic AutoClaw archive comparison
• ruff check .
• ruff format --check .
• actionlint
• claude plugin validate . --strict
• git diff --check

Independent review

Structured review found no P0/P1 issues. Its one non-blocking P2—ambiguous provenance between locally reproduced xAI checks and hosted checks—was resolved in 545028c.