self-review 2026-05-18: raise SEM_FLOOR to 0.70, add ACT-R frequency resistance to decay

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Semantic seed floor raised 0.65 → 0.70: field literature (SuperLocalMemory
arXiv:2604.04514) validates 0.70-0.75 as the noise floor for sentence-transformer
embeddings on non-trivial corpora. The 0.65 threshold was admitting false
positives that diluted BFS traversal quality on the 13K-node post-ingestor graph.
Top-30 cap retained — sparse graph (1.26 edges/node) needs more semantic entry
points than a dense graph would.

ACT-R Base-Level Learning insight applied to engram_temporal_decay: current
purely time-based formula treated a node activated 100 times identically to a
node never activated (same decay rate). ACT-R BLL (Anderson 1993) shows
frequently-accessed memories resist temporal decay. Fix: freq_resist multiplier
= 1.0 + 0.1 * log(1 + activation_count). count=0→1.0×, count=9→1.23×,
count=99→1.46×. Existing activation_dampening continues to reduce per-query
novelty for well-known nodes — the two mechanisms are complementary: resist
decay (durable in graph), dampen per-query (don't dominate any single turn).

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Will Anderson

2026-05-18 08:41:01 -05:00

parent b90333e9e7

commit ee1627c2c0

2 changed files with 27 additions and 5 deletions

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