feat: add 5 critical UK P0 legal documents to corpus
- Employment Rights Act 1996 (1007 KB)
- Patents Act 1977 (445 KB)
- Trade Secrets Enforcement Regulations 2018 (18 KB)
- Social Security Intermediaries Regulations 2000 (19 KB)
- Database Rights Regulations 1997 (18 KB)
Integration includes:
* Copied source files to raw/uk/{employment,ip,tax}/
* Added rows to manifests/download_manifest.csv with SHA-256 hashes
* Updated logs/download_log.csv with ingestion timestamps
* Ingested documents into Chroma vector database (5 docs -> 28 vectors)
* Updated ROADMAP.md with UK completion statistics
* Updated README.md with setup, ingestion, and structure documentation
All UK P0 documents now complete for freelancer contract analysis.
Chroma collection vectors increased from 5,262 to 5,290.
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