Normalize retrieval IDs for scoring and deduplication

[silasbrookshaha]

Fixes #4130

Summary

• Add retrieval ID helpers for canonical graph/vector ID keys and value-based triplet keys.
• Use canonical IDs when Temporal search maps vector scores back to graph events, fixing UUID-vs-string score misses.
• Replace identity-based triplet deduplication in QueryState and query decomposition merges with value-based triplet keys.

Audit summary

• cognee/modules/retrieval/temporal_retriever.py: fixed score_lookup writes and event reads to use normalize_id().
• cognee/modules/retrieval/utils/query_state.py: fixed context-extension and CoT triplet merging to use triplet_key().
• cognee/modules/retrieval/utils/query_decomposition.py: fixed decomposed-retrieval edge merging to use triplet_key().
• Searched cognee/modules/retrieval and cognee/modules/graph for Python id() calls after the change; no remaining identity-based dedup call sites were found.

Tests

• /private/tmp/cognee-contract-venv/bin/python -m pytest cognee/tests/unit/modules/retrieval/temporal_retriever_test.py::test_filter_top_k_events_sorts_and_limits cognee/tests/unit/modules/retrieval/temporal_retriever_test.py::test_filter_top_k_events_matches_uuid_scores_to_string_event_ids cognee/tests/unit/modules/retrieval/temporal_retriever_test.py::test_filter_top_k_events_includes_unknown_as_infinite_but_not_in_top_k cognee/tests/unit/modules/retrieval/utils/test_query_state.py cognee/tests/unit/modules/retrieval/graph_completion_decomposition_retriever_test.py::test_merge_deduplicated_edges_deduplicates_fresh_logically_equal_edges -q
• /private/tmp/cognee-contract-venv/bin/python -m pytest cognee/tests/unit/modules/retrieval/graph_completion_retriever_context_extension_test.py::test_get_completion_context_extension_stops_early cognee/tests/unit/modules/retrieval/graph_completion_retriever_context_extension_test.py::test_get_completion_batch_queries_context_extension_stops_early -q
• /private/tmp/cognee-contract-venv/bin/python -m pytest cognee/tests/unit/modules/retrieval/graph_completion_decomposition_retriever_test.py -q
• /private/tmp/cognee-contract-venv/bin/python -m ruff check cognee/modules/retrieval/utils/ids.py cognee/modules/retrieval/temporal_retriever.py cognee/modules/retrieval/utils/query_state.py cognee/modules/retrieval/utils/query_decomposition.py cognee/tests/unit/modules/retrieval/temporal_retriever_test.py cognee/tests/unit/modules/retrieval/utils/test_query_state.py cognee/tests/unit/modules/retrieval/graph_completion_decomposition_retriever_test.py --output-format concise
• /private/tmp/cognee-contract-venv/bin/python -m py_compile changed Python files
• git diff --check

Note: I also tried running all of cognee/tests/unit/modules/retrieval/temporal_retriever_test.py locally; one existing test reaches the LLM gateway and fails in this environment because no LLM API key is configured.

[github-actions]

Hello @silasbrookshaha, thank you for submitting a PR! We will respond as soon as possible.