[Bug]: AutoDeploy import checker silently passes unreadable source files #17753

System Info

Platform-independent source inspection.

Reproduction

scripts/check_auto_deploy_imports.py::_check_file() currently does:

try:
    source = path.read_text()
except (OSError, UnicodeDecodeError):
    return []

If an AutoDeploy Python file cannot be read or decoded, the checker reports zero violations. The caller therefore treats that file as passing the import-discipline check.

Expected behavior

A checker that cannot inspect an in-scope source file should fail closed and report the read/decode failure as a violation.

Actual behavior

Read and decode failures are silently accepted.

Proposed fix

Return a diagnostic violation for read/decode failures and add a regression test that simulates an OSError.