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rUvandClaude f13b8567de dream(performance): #3265 stop re-tokenizing MMR candidates that PR #3169 mostly stopped needing (evaluated, ACCEPT) (#3266)
* dream(performance): #3265 stop re-tokenizing MMR candidates that PR #3169 mostly stopped needing

mmrRerank() eagerly re-tokenized every remaining candidate's content on
every outer-loop pass (O(N x limit) tokenize() calls), a pattern that
predates and survived PR #3169 unchanged. #3169 made embedding-cosine
the preferred, now-common pairSimilarity path, so most of that
tokenization was computed and then discarded. Tokens are now computed
lazily and cached per-candidate, only when the Jaccard fallback is
actually needed.

Evaluated: tokenize() calls 400 -> 0 on a 30-candidate/limit-20
all-embedded corpus (stash-isolated: fails against real baseline,
passes against candidate); vitest bench shows the candidate 5.88x
faster (independently reproduced at 5.96x by an adversarial critic).
Selection output is byte-for-byte identical to baseline across
all-embedded/no-embedding/mixed scenarios. 473/474 full package suite
both ways (1 pre-existing, unrelated environmental failure), tsc clean.

Evaluated, ACCEPT. Full research (5-role parallel fan-out), evaluation
receipt, adversarial critique, Darwin/Flywheel scoping, reward-hack
check, and security/hive-mind scan findings in the linked issue and
gist.

Closes #3265

Co-Authored-By: RuFlo <ruv@ruv.net>
Claude-Session: https://claude.ai/code/session_01P5UJ62RVAbq8DLEEXPrwvU

* dream(performance): append 2026-09-10 ledger row (#3265, #3266)

Co-Authored-By: RuFlo <ruv@ruv.net>
Claude-Session: https://claude.ai/code/session_01P5UJ62RVAbq8DLEEXPrwvU

---------

Co-authored-by: Claude <noreply@anthropic.com>
2026-09-14 23:43:16 +00:00
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