feat: release Doable TRD Context 0.1.5

[alphali]

Summary

• release Doable TRD Context 0.1.5 across Codex, Claude Code, and Cursor manifests
• remove fixed exploration time, repository, file-count, and output-size limits
• add atomic candidate initialization, repair, validation, finalization, and concise renderer handoff
• update multi-repo, fixture, environment, privacy, testing, and customer README guidance

Verification

• Skill Creator quick validation
• npm test
• claude plugin validate .
• claude plugin validate ./plugins/doable-trd-context
• git diff --check