Humanize identities in semantic diff findings

[forhappy]

Summary

• resolve stable entity IDs to function and graph-node names for reviewer-facing semantic diff output
• show human-readable names in headlines, explanations, affected consumers, witness paths, evidence, and before/after values
• preserve raw stable IDs in machine JSON and add an entity_display_names lookup for tooling
• precompute presentation replacements once per report for large finding sets

Verification

• cargo test -p compass-semantic-diff
• cargo test -p compass-cli semantic_diff_render --lib
• cargo test -p compass-cli --test history_cli diff_emits_semantic_text_json_html_and_rejects_removed_flags -- --exact
• cargo clippy -p compass-cli -p compass-semantic-diff --all-targets --no-deps -- -D warnings
• generated and browser-rendered a real CocoIndex semantic diff for 90571539fa291fc6e6b248095bd2c8a2ff68bab4..71f9cc9dc693080310181a2d011fb737420f7907; verified the reported hashes render as AsyncFunction.__call__, AsyncFunction._core_processor_with_deadline, and AsyncFunction._execute while raw IDs remain only in embedded machine data
• graphify update .