fix: Enable deduplication for trailing extraction indexing

[abrookins]

Summary

• pass deduplicate=True when delayed extraction indexes memories
• preserve existing delayed extraction behavior while preventing duplicate long-term entries
• assert the deduplication flag in test_extraction_logic_fix

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Note

Medium Risk
Enables deduplication in the delayed/trailing extraction indexing path, which can change what long-term memory records are persisted (skip/merge/delete duplicates). Impact is limited to trailing extraction but touches data integrity behavior.

Overview
Trailing-edge (delayed) extraction now indexes with deduplication enabled. run_delayed_extraction passes deduplicate=True into index_long_term_memories, preventing duplicate long-term entries when delayed extraction runs.

Tests are updated to assert the deduplicate flag is set on the indexing call during delayed extraction.

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[jit-ci]

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✅ No security findings were detected in this PR

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