fix: use chunked read for extension manifest hash - #3841
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Replace unbounded f.read() with chunked iteration to prevent excessive memory allocation on large or corrupted manifest files. Matches the pattern used in integrations/manifest.py _sha256().
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Summary
Replace unbounded
f.read()with chunked iteration to prevent excessive memory allocation.Changes
extensions/__init__.py: Use chunked read inget_hash()matchingintegrations/manifest.pypattern