Fix ephemeral target worker repinning

[ytallo]

Summary

• retain the bootstrapped target binary during the post-runner exact-pin reconciliation
• capture the engine worker inventory and fail closed when the Harness runtime version differs from the contract
• cover the workflow behavior with the shadow-contract tests

Validation

• bash -n harness/tests/e2e/run-shadow-control-ci.sh
• python3 .github/scripts/tests/test_harness_e2e_shadow_contract.py
• PYTHONPATH=.github/scripts python3 -m unittest discover -s .github/scripts/tests -p "test_*.py"

[vercel]

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Project	Deployment	Actions	Updated (UTC)
workers	Ready	Preview	Aug 20, 2026 4:42pm
workers-tech-spec	Ready	Preview	Aug 20, 2026 4:42pm

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d39ebb38-85b8-4e6b-917a-427b865f400c

📥 Commits

Reviewing files that changed from the base of the PR and between 58bd132 and 7af3ec3.

📒 Files selected for processing (2)

• .github/scripts/tests/test_harness_e2e_shadow_contract.py
• harness/tests/e2e/run-shadow-control-ci.sh

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[github-actions]

skill-check — worker

0 verified, 62 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.