feat: add Rust ecosystem support to xray

docs: document markdown support

feat: add markdown file support

feat: add python ecosystem support to xray

feat: improve SQL extraction recovery and --who semantic matching

feat: improve SQL extraction recovery for policies and plpgsql

docs: add SQL extraction gaps and improvement plan

feat: extract ALTER TABLE as structured symbol with target ref

fix: filter SQL output noise — orphan fragments, SET, psql metacommands

fix: prevent panic on UTF-8 multi-byte chars in SQL extractor

feat: add SQL support + LanguageKind abstraction + LSP client

feat: add --trace mode for cross-file call graph traversal

feat: add follow, reverse, and resolve modes with decorator support

chore: prepare for public release

feat: JSX component detection + refactor extract.rs