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Systematic validation of all Phase 9c token-saving features: compact AST (6-7% of full size), lean scope (4% of detailed), diagnostic deltas, budget pagination across 3 pages, batch queries, and combined 95% savings. Benchmark confirms sub-millisecond parse->mutate->diagnose cycles. Also adds Environment Layer feature request to docs/annotations. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>