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This improves Rust prompt-building by deduplicating repeated CLAUDE instruction content, surfacing clearer project-context metadata, and truncating oversized instruction payloads so local rules stay useful without overwhelming the runtime prompt. The change preserves ancestor-chain discovery while making the rendered context more stable, compact, and readable for downstream compaction and CLI flows. Constraint: Keep existing CLAUDE.md discovery semantics while reducing prompt bloat Constraint: Avoid adding a new parser or changing user-authored instruction file formats Rejected: Introduce a structured CLAUDE schema now | too large a shift for this parity slice Confidence: high Scope-risk: narrow Reversibility: clean Directive: If richer instruction precedence is added later, keep duplicate suppression conservative so distinct local rules are not silently lost Tested: cargo fmt; cargo clippy --all-targets --all-features -- -D warnings; cargo test -q Not-tested: Live end-to-end behavior with very large real-world CLAUDE.md trees