Two changes to the activation path, both grounded in measurement on the live
store rather than on the spec.
1. Rescale cosine before the query gate.
The propagation gate (arXiv:2606.30133, added in an earlier review) fed RAW
cosine into FLOOR + (1-FLOOR)*c. Raw cosine from nomic-embed is compressed
into a narrow high band, so that expression is close to a constant.
Measured, 400 random UNRELATED node pairs on the live store:
median 0.562, central 98% span [0.381, 0.743]
So a node with no semantic relation to the query was propagating at
0.25 + 0.75*0.562 = 0.67. Two thirds strength. The gate was a small tax.
Fixed by shifting and flooring about ENGRAM_EMBED_S0 -- which is already in
this file, already 0.45, and already used exactly this way by the Pass-2 WM
term. The propagation gate simply never used it. Same 400 pairs after:
median unrelated pair falls to 0.40, top of range preserved (0.85 vs 0.92),
gate spread widens 0.42 -> 0.60. Only 8.5% reach the floor, so dissimilar
lexical/structural pathways are damped, never severed. Range is unchanged
at [0.25, 1.0], and cosq == NULL still degrades to no gating at all.
2. Decompose the WM eviction counter by cause.
_eg_act_wm_evicted was incremented from six sites with four distinct causes
and collapsed all of them into one integer. Today's review measured 175,547
evictions over 13.5h (~216/min against 24 slots) and could not tell healthy
rotation from cap thrashing from duplicate churn.
That is this file's most-repeated defect: dup_wm and dup_wm_global exist
only because the aggregate could not answer "why" during the 08-02 and
08-06 incidents. Each of those needed a NEW gauge before it was diagnosable.
evict_floor / evict_cap / evict_bll complete the decomposition, so
wm_evicted == floor + cap + bll + dup_wm + dup_wm_global
holds as an identity and each term implies a different correction. Verified
on an isolated instance: 30 nodes, 24 filled the cap, wm_evicted 6 ==
evict_cap 6, all other terms 0.
Built and smoke-tested out of tree. The live daemon runs a pinned binary and
was deliberately not restarted -- the store compaction workstream is in flight.
bigmerge
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