feat: add idempotent tracker-aware setup-dev-backlog (#277)

[sungjunlee]

Summary

• add an idempotent setup-dev-backlog.js entrypoint with explicit github and local tracker selection
• preserve existing and legacy authority without environment-driven switching
• keep configuration and user task/sprint content byte-stable through atomic, fail-closed setup
• align the shared runtime config reader with accepted commented, block, and multiline scalar forms

Validation

• node --test skills/dev-backlog/scripts/setup-dev-backlog.integration.test.js (17/17)
• node --test skills/*/scripts/*.test.js (639 pass, 1 existing opt-in skip)
• bash skills/dev-backlog/scripts/smoke-test.sh (155/155)
• component lint, capabilities doctor strict, backlog doctor, and git diff --check
• independent relay review: LGTM at 26482d6

Closes #277

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: dd0c372b-c44c-4109-aa00-1b74c51fb1c8

📥 Commits

Reviewing files that changed from the base of the PR and between 025cb23 and 26482d6.

📒 Files selected for processing (7)

• skills/dev-backlog/scripts/github-ownership.test.js
• skills/dev-backlog/scripts/init.sh
• skills/dev-backlog/scripts/lib.js
• skills/dev-backlog/scripts/lib.test.js
• skills/dev-backlog/scripts/setup-dev-backlog.integration.test.js
• skills/dev-backlog/scripts/setup-dev-backlog.js
• skills/dev-backlog/scripts/setup-dev-backlog.test.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch relay/issue-277-tracker-aware-setup

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[sungjunlee]

Relay Review

Verdict: LGTM
Summary: Final independent review finds no contract blockers at 26482d6. Tracker setup state, byte preservation, filesystem atomicity, provider isolation, remote recommendation, and setup-to-runtime scalar seams all pass.
Contract: PASS
Quality Review: PASS
Quality Execution: PASS
Rounds: 11

[chatgpt-codex-connector]

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Reviewed commit: 26482d6b8d

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[chatgpt-codex-connector]

Guard missing configs before selecting local tracker

When backlog/ already contains task files but config.yml is missing, this branch writes a fresh config using the requested selection, so --tracker local can silently flip a legacy checkout from the runtime default GitHub authority (lib.js lines 32-34) to local. Existing GitHub mirrors use id: BACK-N (sync-pull.js lines 195-197), and the local adapter accepts that same id/ref shape (local-tracker.js lines 322-340), so those issue mirrors are immediately treated as local tasks instead of failing closed like the tracker-less-config path does. Please guard missing-config-but-nonempty backlog before allowing a direct local switch.

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