docs: session wrap-up (comprehension chaining + overfitting discipline) + CLAUDE.md substrate (#472)
- New session record SESSION-2026-05-29-comprehension-and-overfitting-discipline.md:
the reconciliation wave, CP-1/CP-2a (no cue reliable yet -> structure-first),
GB-3a referent guard, GB-3b.1 accumulation (practice 0->55), the GB-3b.2
overfitting course-correction (96/150 synthetic vs 1/50 real -> torn down), and
the confuser corpus (baseline: 7 defects surfaced). Serving 3/47/0 throughout.
- Lands the prior dangling SESSION-2026-05-29-multistep-build-arc.md (was untracked).
- CLAUDE.md "Current Key Modules": adds the sealed GSM8K comprehension substrate
(core/reliability_gate, generate/derivation, generate/cue_precision,
evals/gsm8k_math {train_sample,practice,confusers}, the lane-SHA gate).
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