Thin defaults/AGENTS.md + defaults/TOOLS.md + runtime/claude/RUNTIME.md to a core
that references guides on demand; preserve the full tool catalog in new
guides/TOOLS-REFERENCE.md. All 12 hard gates verbatim; validated via a deterministic
gate-checklist + a 9-probe headless A/B (thin 7/9 vs monolith 5/9). Composed
AGENTS+TOOLS+RUNTIME 8,827->4,122 tok. Diet-only against repo content; no behavioral
change, nothing imported from drifted deployments.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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