test(office): align Python support contract with PR matrix

[seonghobae]

Problem

Protected main@a40b9489665bed7d95af619a6079b9c51cab299a already contains the #401 queue-fan-out change: the Office job runs only Python 3.14 for pull_request, while protected pushes retain the advertised 3.11–3.14 matrix. The retained repository contract still parses only a literal static list and therefore no longer describes the live workflow it is supposed to police.

This is a test-contract repair for already-integrated workflow truth. It does not change .github/workflows/ci.yml, the supported Python range, package metadata, dependencies, Office runtime behavior, or release policy.

RED → GREEN

RED on protected main: office/tests/test_python_support_contract.py requires python-version: [..] and exact equality to all four supported minors, but the protected workflow now uses the event-dependent expression ${{ github.event_name == 'pull_request' && fromJSON('["3.14"]') || fromJSON('["3.11", "3.12", "3.13", "3.14"]') }}. The structural contract cannot parse that current authority.

Candidate GREEN 378e03078a90f18c48317673344e4f1adb11ec8f changes only the contract test. It requires the exact event-sensitive shape, pins pull-request admission to the newest supported minor, and independently pins protected-push coverage to the complete advertised 3.11–3.14 set. The runner-image and release-workflow contracts remain unchanged.

This delta was discovered while reviewing #403 and is split into this repository-contract owner lane so the collaboration PR can be evaluated relative to a narrow prerequisite rather than permanently owning unrelated Office CI semantics.

Keep Draft until the unchanged exact head has terminal applicable CI/security/review evidence. No predecessor result, no-op retrigger, self-approval, force update, destructive rebase, or workflow-gate weakening is accepted.

[coderabbitai]

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