fix(recall): resolve which-year leftover covering from as-of durations

[sdntsng]

Summary

Which-year leftover covering returned the as-of calendar year from lines like for N years as of DATE instead of the start year (asOf.Year()-N). Generic reader rewrite, not a LoCoMo-named rule.

Skip-ingest 180 pin: 111/180 (0.617), +1 / −0 vs P24 110/180. Temporal 28→29. Named recovery: conv-49-q25 health start year 2021. MH/OD/SH held 18/4/60. Ledger RETRIEVAL 29→28 (item was labeled RETRIEVAL); READER held 9; WRITE held 4.

Weak leftover tokens year / years so the question word does not bind covering over the event (a packet with both a yoga-2020 line and a health duration otherwise lets the duration steal yoga which-year).

Does not name LoCoMo. Does not merge #133. "destress" stays denylisted. Do not treat Phuket meditation retreat as a diving place. Does not replace README 11.4% / 70% 1×30.

Standing owner approval: FF dest and main after a net-positive 180.

Changes

• internal/memory/recall.go
  • leftoverCoveringFinish / leftoverCoveringRelativeStartYear rewrite for N years as of DATE to the start year on looksYearQuery.
  • leftoverCoveringYearMissesEvent: an as-of duration answer yields to a resolved start year.
  • year / years added to leftoverCoverWeakToken.
• internal/memory/recall_test.go
  • TestLeftoverCoveringWhichYearResolvesRelativeDuration: health query → 2021; yoga query in the same packet still 2020.
• Pin: locomo-s0-diag-mh-135-p25-20260825.md (locomo-s0-diag-mh-135-p25-product-recall-s1-732148). Product SHA 86d87d6. Cycle-closeout 2026-08-25 — P25. Handover + benchmarks README updated.

Test plan

• gofmt -l clean on touched files
• go test ./internal/memory/ -run 'TestLeftoverCovering|TestPreferUnwind|TestLocation'
• go vet ./internal/memory/ ./cmd/api ./cmd/worker
• Live /recall probes on frozen diag-mh-135: 0/26 fails (health-year gain 2021 + P24 holds including art-show April, community-center 2022, August teammates, destress pottery, Boston garage, James girlfriend April 2022)
• Skip-ingest 180 --run-prefix locomo-s0-diag-mh-135-p25 vs P24 139aa5: 111/180, gained conv-49-q25, lost none

Linear / tracking

• ENG-176 (MH), parent ENG-168.

Risk / follow-ups

• Isolated leftover covering is saturating. Remaining mass is SH PROOF 20 + RETRIEVAL 28 (gold not in top-k). Ranking/compiler next; no fusion fishing.
• Jolene yoga year (conv-48-q50) cannot be recovered by relative-year rewrite — 2020 is not in the leftover packet.
• 111/180 is not 80% (144) and not 90% (162).
• Fair Mem0 180 waits on quota 2026-09-01.
• OpMem 13/13 and marketing 17/17 last pin not re-run this increment.