docs: add Phase 5 (dependabot auto-merge) to v2 rollout playbook - #59
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Captures the last piece of the 2026-04-18 v2 rollout: the Dependabot auto-merge workflow pattern (narrow scope, pull_request_target + actor gate + patch/minor filter) and the deployment via Contents API. Also adds two pitfalls observed during Phase 5: - Private+free-tier repos silently reject allow_auto_merge PATCH. Only paid or public repos accept. Workaround: manual UI toggle or upgrade. - Enabling Dependabot on a long-dormant fleet surfaces backlog (100+ PRs in our case). Expected; subsequent weeks stay quiet. Doc-only change. Skipped by v2.0.1 doc-only classifier.
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Extends the rollout playbook to capture Phase 5, which wasn't known to be needed until Dependabot fleet-enablement surfaced a 100+ PR backlog.
What's new in the playbook
Phase 5 section — scoped auto-merge workflow deployment pattern:
dependabot-auto-merge.ymlas a reference snippetTwo new pitfalls:
allow_auto_mergePATCH. The API returns 200 OK but the field doesn't stick. 24/27 of our fleet accepted; 3 (smartwatermelon/.github,tensegrity,scripts) are private+free and required manual UI toggling or repo-tier upgrade. Only paid tiers (Pro/Team) or public repos accept the field.Timings updated to include Phase 5 (~30 seconds for 54 API calls across 27 repos).
Consumer impact
None — doc-only change.
Expected CI behavior on this PR
Doc-only diff under v2.0.1 → SKIPPED in ~15s.
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