#15 ⚡ Optimize metadata sync with batch transaction

[Anonymous]

Originally created by: sl4m3

This PR optimizes the sync_meta_index method in SemanticStore by wrapping the file indexing loop in a single database transaction. Previously, each file was indexed with an individual INSERT/UPDATE, causing significant overhead.

Changes:

• Added rollback_transaction() and batch_update() context manager to SemanticMetaStore.
• Updated SemanticStore.sync_meta_index to use batch_update() when not already in a transaction.
• Verified performance improvement with a benchmark (removed before submission).
• Verified correctness with existing regression tests.

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PR created automatically by Jules for task 10847141987603889932 started by @sl4m3

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