test(strix): restore compatibility entrypoint coverage

[seonghobae]

Problem

Protected main at c70b081dd93cf9ca53c2277ba95eab0e200cbe5c passes the Strix behavior assertions but no longer satisfies the repository's 100% branch-coverage contract after the GITHUB_ENV publication signature changed. The exact uncovered branches were:

• scripts/ci/install_strix_timeout_compat.py: lines 92 and 127
• scripts/ci/strix_timeout_compat.py: line 99

This is a test-only baseline repair required before the independent Noema stabilization PR can receive trustworthy full-suite evidence.

Change

Add regressions for:

• fail-closed behavior when GITHUB_ENV is absent;
• the real installer __main__ entrypoint and bound file identities;
• the real launcher __main__ entrypoint entering patched Strix.

No Strix production code, timeout policy, provider routing, or workflow behavior changes.

Verification

• RED on exact protected main: missing statements {install_strix_timeout_compat.py: [92, 127], strix_timeout_compat.py: [99]}
• GREEN after tests: 15 passed
• both compatibility modules: 100% statement and branch coverage
• verified again as part of full repository run: 2342 passed, 1 skipped, 21 subtests passed; scripts/ci 100% coverage

Evidence: https://github.com/ContextualWisdomLab/.github/actions/runs/33514831758

Scope

One file, one test-only commit. This PR is deliberately separate from the BandScope/Noema incident repair.

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[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between c4f3ba3 and 1e121e0.

📒 Files selected for processing (1)

• tests/test_strix_llm_timeout_contract.py

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[seonghobae]

QUEUE_SATURATION_CHICKEN_EGG decision for exact head 1e121e0d52c9a277e851d280b2249445f6845894: GitHub reports the PR mechanically mergeable with no conflicts; the diff is one test-only file and changes no Strix production/runtime policy; Devin reports no issues and CodeRabbit/Devin exact-head statuses are success; there are zero review threads; the regression was proven RED on protected main and the same test slice/full-suite evidence reached 100% scripts/ci coverage before extraction into this one-file successor. The exact-head Security Scan, CodeQL, Semgrep, Python Security, OSV, Scorecard, Secret Scan, and SBOM runs are all still queued together under the saturated central Actions fleet. This test-only baseline repair is itself a prerequisite for trustworthy full-suite evidence on the Noema changed-line repair (#1612), so waiting for the saturated lanes creates the circular admission condition this control loop is authorized to break. No failing substantive test/security/review evidence is being bypassed. Merge will be guarded by expected_head_sha.