docs: conclude GitHub Projects projection pilot

[sungjunlee]

Summary

• record a reproducible GitHub Projects v2 capability matrix from private pilot Project Add integration contract doc for dev-relay interop #5
• verify six real Issues and 18/18 Priority, Iteration, and Target Date values across two planning cycles
• prove invalid-auth and invalid-iteration writes leave Git, sprint, Issue, and Project snapshots unchanged
• keep Projects outside setup, task resolution, sprint execution, and the Issue-to-PR core
• conclude that milestones + labels + sprint Plan ordering remain the default because the pilot did not reduce time or calls

Evidence

• Project items: 6/6
• initial and final field read-back: 18/18
• cycle 2: 4 writes + 1 read, 45.8 s
• milestone + labels baseline: 1 read, 4.0 s
• failure probes: 2/2 non-zero; four before/after SHA-256 snapshots identical
• mirrorless core absence acceptance: 3/3
• contract prose: 8/8
• independent review: no findings
• no Project runtime code, adapter, config, or sync loop added

Fixes #349

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2c1cc059-6a50-4d0f-8097-571c59c060dd

📥 Commits

Reviewing files that changed from the base of the PR and between 3865a37 and 0be0917.

📒 Files selected for processing (4)

• backlog/sprints/2026-07-github-native-core-simplification.md
• docs/github-projects-projection-pilot.md
• skills/dev-backlog/references/github-sync.md
• skills/dev-backlog/scripts/contract-prose.test.js

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/projects-projection-pilot

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