v0.1.10

Added

• Lookup cache — load_bundle() now auto-caches parsed concepts to .okf_lookup_cache.json. Subsequent lookups skip re-parsing all .md files unless bundle changed (mtime fingerprint). ~1.8x faster on 220-concept bundle, scales better on larger bundles.
• --no-cache flag to bypass cache for debugging.

Changed

• .gitignore — ignores .okf_lookup_cache.json.

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