fix(controller): persist created PR identity

[Wibias]

Summary

Persist the verified pull-request number into the workflow controller after a successful create_pr mutation.

Trace evidence

The newest Grok trace successfully created and live-verified PR #391, but the persisted controller checkpoint still contained pr: null.

Root cause

reconcileMutationResult() only reconciled successful push_code receipts into headSha. Completed create_pr receipts were recorded for publication completeness but their verified PR identity was never applied to controller refs.

Fix

• reconcile completed create_pr results for the routed repository
• use the broker's verified/idempotent PR number
• reject ambiguous multi-PR reconciliation
• preserve existing push reconciliation semantics

Focused regression coverage asserts that a verified successful create_pr changes checkpoint pr to the created number.

No merge or release publication is authorized by this PR.

[coderabbitai]

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Run ID: c5f1388e-6492-4d0b-b058-73226a6520e1

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