feat(memory): temporal versioning on graph memory edges#1775
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Add valid_from/valid_until temporal support to graph memory via: - Migration 030: two partial indexes on graph_edges for temporal BFS traversal - GraphStore: edges_at_timestamp(), bfs_at_timestamp(), edge_history() backed by shared bfs_core() helper that eliminates BFS code duplication - graph_recall: optional at_timestamp parameter and temporal_decay_rate scoring (default 0.0 preserves existing behavior unchanged) - GraphFact: valid_from field + score_with_decay() for recency-boosted ranking - GraphConfig: temporal_decay_rate config knob (default 0.0, in default.toml) - recall_graph: propagates at_timestamp and temporal_decay_rate through Closes #1341
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…ory, bfs_at_timestamp Add 14 unit tests covering boundary conditions and happy paths for three methods added in #1775: - edges_at_timestamp: valid_from==ts inclusive, valid_to==ts exclusive (with ts-1s boundary pair), multiple edges on same entity, no-edge entity - edge_history: basic ordering, limit truncation (with pre-condition proof), non-matching relation, empty entity, fact substring filtering (subset proof) - bfs_at_timestamp: zero hops, expired intermediate blocks traversal, disconnected entity, reverse direction, valid_to==ts exclusive boundary Closes #1776
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…ory, bfs_at_timestamp Add 14 unit tests covering boundary conditions and happy paths for three methods added in #1775: - edges_at_timestamp: valid_from==ts inclusive, valid_to==ts exclusive (with ts-1s boundary pair), multiple edges on same entity, no-edge entity - edge_history: basic ordering, limit truncation (with pre-condition proof), non-matching relation, empty entity, fact substring filtering (subset proof) - bfs_at_timestamp: zero hops, expired intermediate blocks traversal, disconnected entity, reverse direction, valid_to==ts exclusive boundary Closes #1776
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…ory, bfs_at_timestamp (#1784) Add 14 unit tests covering boundary conditions and happy paths for three methods added in #1775: - edges_at_timestamp: valid_from==ts inclusive, valid_to==ts exclusive (with ts-1s boundary pair), multiple edges on same entity, no-edge entity - edge_history: basic ordering, limit truncation (with pre-condition proof), non-matching relation, empty entity, fact substring filtering (subset proof) - bfs_at_timestamp: zero hops, expired intermediate blocks traversal, disconnected entity, reverse direction, valid_to==ts exclusive boundary Closes #1776
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Summary
valid_from/valid_untiltemporal query support to graph memory edgesGraphStoremethods:edges_at_timestamp(),bfs_at_timestamp(),edge_history()with sharedbfs_core()helpergraph_recallgains optionalat_timestampandtemporal_decay_rateparameters (defaults keep existing behavior unchanged)GraphFactgainsvalid_fromfield andscore_with_decay()for recency-boosted rankinggraph_edgesoptimized for temporal BFS traversaltemporal_decay_rateconfig knob in[memory.graph](default 0.0 = disabled)Closes #1341
Test plan
cargo nextest run --config-file .github/nextest.toml --workspace --features full --lib --bins— 5559 tests passcargo clippy --workspace --features full -- -D warnings— 0 warningscargo +nightly fmt --check— cleanat_timestamp = None+temporal_decay_rate = 0.0produce identical output to previous behavioredges_at_timestamp(ts)returns only edges withvalid_from <= ts AND (valid_to IS NULL OR valid_to > ts)edge_historyreturns all versions of a (subject, predicate) pair including superseded ones