docs(ADR-0136): statement-layer corridor, S.0 taxonomy, 2026-05-23 brief archive (#200)
* docs(ADR-0136): statement-layer corridor + S.0 taxonomy + resolve math-file conflicts
- Add ADR-0136-statement-layer-corridor.md: corridor overview, S.0-S.4 phase table,
taxonomy summary (23 context-filler, 4 rate-class, 5 compound, 17 long-tail),
standing invariants (admitted_wrong==0, context-filler safety rail, honest delta).
- Restore generate/math_*.py to HEAD (main) — stash-pop conflict markers were
cosmetic comment rewording; upstream version is authoritative.
- Stage docs/reviewers.yaml math_expert_claims addition (already authored).
* docs(briefs): archive all 2026-05-23 parallel-dispatch briefs (L1–L17 + README)
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