test(ci): remove stale local PR steward contract after centralization

[seonghobae]

RCA

Protected main no longer contains .github/workflows/hourly-pr-steward.yml; PR merge/review governance was centralized in ContextualWisdomLab/.github. However services/account_unification/tests/test_hourly_pr_steward.py still unconditionally opens that deleted local workflow.

Fresh hosted evidence on unrelated #153 merge ref failed five tests with the same FileNotFoundError for that absent workflow. This is a repository baseline defect, not a .env migration failure.

Repair

Delete only the stale static contract test. Do not recreate the completed local merge-steward workflow, weaken current CI, or alter .github/workflows/hourly-product-development.yml. The current central governance workflows and their own conformance tests remain authoritative.

This follows the repository rule that completed self-modifying/source-fix workflow copies are removed after central ownership is established; retaining a test for a deleted local owner creates a false failing contract.

Verification

This PR must run the complete current-head CI/security/review gates. The deletion does not exempt any production Python line/branch from the existing 100% coverage requirement and does not change application behavior.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7d9151c and 85deb47.

📒 Files selected for processing (1)

• services/account_unification/tests/test_hourly_pr_steward.py

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