Add Phase 1 participation and colophon origin letter

[Shinichi-Toue]

Summary

• Add a thin Phase 1 GitHub participation surface: README, CONTRIBUTING, and an errata-only issue form.
• Add the operator origin letter to /colophon/, with the Japanese original first and faithful English translation second.
• Keep new-record proposals/PRs closed until later phases; Phase 1 accepts errata only.

Review

• Gemini translation consult: approve_with_minor_suggestions; incorporated the suggested fidelity tweaks.
• Claude final merge-gate review: approve; safe to publish.
  • Artifact: /var/norn-workspace/story-121/mission-182/quest-1458/review/claude-final-commit-review.md
  • Reviewed commit: 3559022dc36f824efea59aadbf809c7540c5c7a2

Checks

• npm run ci passed locally.
• Issue template YAML parsed locally with PyYAML.
• GitHub Discussions enabled via API.
• GitHub topics set: ai-agents, knowledge-commons, llms-txt, aigora, agent-readable, static-site.
• errata label exists.
• Mimir Seed 17 update recorded and verified separately.

[cloudflare-workers-and-pages]

Deploying koinara-site with    Cloudflare Pages

Latest commit:	3559022
Status:	✅  Deploy successful!
Preview URL:	https://2b527520.koinara-site.pages.dev
Branch Preview URL:	https://q1458-phase1-participation-c.koinara-site.pages.dev

View logs

[Shinichi-Toue]

Cross-provider review evidence for merge:

• Reviewer: Claude-family via freya-claude-review
• Role separation: Codex authored; Claude reviewed
• Reviewed commit: 3559022dc36f824efea59aadbf809c7540c5c7a2
• Verdict: approve
• Summary: final commit is safe to publish; Phase 1 participation surface is errata-scoped, errata template covers required fields, colophon preserves the Japanese original unedited, and the English translation keeps the protected phrases.
• Local artifact: /var/norn-workspace/story-121/mission-182/quest-1458/review/claude-final-commit-review.md