Feat/issue 15 llm descriptions

[theshantanujoshi]

This PR addresses Issue #15 by adding a local build script (scripts/build-llm-descriptions.ts) that uses Transformers.js and the Qwen1.5-0.5B-Chat model to enrich entity descriptions in the knowledge base.

Key Changes:

• New Script: Added scripts/build-llm-descriptions.ts to identify and fill description gaps in the archive using local AI.
• Workflow Integration: Updated package.json with a new build:llm-descriptions command.
• Enriched Data: Successfully generated and merged new lore descriptions for several entities (including Beru Lars, Wicket, and Ayla Secura) into data/build/kb.json.
• Manifest Updates: Updated data/build/manifest.json to track LLM enrichment counts.

Verification:

• Tested the script locally with npx tsx scripts/build-llm-descriptions.ts --limit 1 --skip-review.
• Verified that the "Lore" section correctly appears in the Datapad UI for the enriched entities.

[safedep]

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[adhit-r]

Holding this for cleanup before merge. npm run typecheck passes, but git diff --check fails on trailing whitespace in scripts/build-llm-descriptions.ts.

The bigger review concern is the generated data/build/kb.json churn: this PR changes ~11k lines of generated data alongside the script. Please split the script/tooling change from generated content, or keep the generated output to a small reviewed sample so the data changes are auditable.