docs: record public launch evidence

[builtbyhuy]

Summary

• record the public v0.1.0 release and SHA-256-bound evidence asset
• record the two bounded maintainer Discussions separately from outcomes
• keep Codex for Open Source application readiness on HOLD pending independent use and sustained maintenance

Verification

• npm test: 158 pass, 0 fail, 1 expected strict-Docker skip
• anonymous release asset download matches SHA-256 and contains 21 files
• both public Discussion URLs return HTTP 200 and GitHub records zero replies at ledger time
• git diff --check