Add CI enforcement for codegen and lint compliance

[Copilot]

Prevents commits with stale generated code or unformatted files by enforcing make codegen lint in CI.

Changes

• New codegen_check job in test.yml: Runs make codegen lint on Python 3.10 and fails if any files are modified or untracked, ensuring sync library stays current with async source
• Updated job dependencies: test_quick now depends on codegen_check to gate all tests on codegen compliance
• Documentation updates: Added CI enforcement notice to AGENTS.md and DEVELOPING.md

Implementation

The check uses:

git diff --exit-code                        # Detect modified files
git ls-files --others --exclude-standard    # Detect untracked files

Both must return empty for the build to pass.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Run codgen build step</issue_title>
<issue_description>We should run make codegen lint as part of the build and if anything changes fail the build
</issue_description>

Comments on the Issue (you are @copilot in this section)

@strawgate @claude please make a PR

• Fixes Run codgen build step #153

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch copilot/run-codegen-build-step

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Quality Gate failed

Failed conditions
1 Security Hotspot

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