docs: add agentic contributor guide for projectbluefin org

[castrojo]

Summary

• Adds docs/agentic-contributing.md — human-facing contributor guide for the agentic-first projectbluefin reboot
• Updates sidebars.ts to place the new guide first in the Contributing sidebar category
• Does not modify or remove the existing contributing.md

What this guide covers

• Honest current-state framing (F1 car section) — what is operational, what is failing (e2e), what is deferred
• KubeStellar Hive and ACMM — facts only, with citations to Andy Anderson's arXiv:2604.09388 and CNCF blog; metrics attributed to the KubeStellar Console case study, not claimed for Bluefin
• The four human decision gates (Design / Security / Breakage / Merge)
• The self-improvement loop and skill file requirements
• Full repo map with Mermaid dependency graph
• Build and promotion pipeline — PR → validation → build → e2e → weekly promotion → :stable with 2-human gate
• bonedigger data donation model (ujust report/confirm/verify, issue lifecycle state diagram)
• How to review an agent PR — evidence checklist, skill file check, red flags
• /e2e dispatch, PR image switching, testsuite table (11 suites, 242 scenarios)
• Glossary of agentic-specific terms

5 Mermaid diagrams: system overview, self-improvement loop, repo dependency graph, build/promotion pipeline, issue lifecycle.

Test plan

• npm run build passes
• /agentic-contributing page generates in build/
• Sidebar entry appears under Contributing
• Only 2 files in diff (docs/agentic-contributing.md, sidebars.ts)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: b99874ce-2a92-40fe-beb5-b3f2809f1cf9

📥 Commits

Reviewing files that changed from the base of the PR and between 389ecf1 and 7226ba6.

📒 Files selected for processing (2)

• docs/agentic-contributing.md
• sidebars.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/agentic-guide

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