RAG Bridge, Memory Enhancer, Feedback Loop, IR Metrics (MRR, NDCG,
Recall, Precision, MAP), Hybrid Search (vector + BM25/TF-IDF with RRF),
Cross-Encoder Reranking, and Text Search Providers.

Also ships tech debt fixes from v0.7.1 work (never published):
MCP tools.py split, 155 retrieval tests, embedding perf boost,
storage factory, consolidation strategies.

- Version bump: 0.7.1 -> 0.8.0 (pyproject.toml, __init__.py, package.json)
- Added 4 missing RAG exports to alma/__init__.py
- Added 5 RAG keywords to pyproject.toml
- Added 35 new text search tests (test_text_search.py)
- Updated CHANGELOG.md, README.md, roadmap
- Cleaned up 3 misplaced root docs
- Full test suite: 1,580 passed, 212 skipped, 0 failed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>