* docs: rewrite README for v0.3.0
- Add "Why agentmemory" section explaining what it provides and comparison table
- Add "Supported Agents" section with native hooks, MCP, and REST API paths
- Add integration decision matrix for choosing the right approach
- Document hybrid search, embedding providers, and progressive disclosure
- Document memory evolution, versioning, relationships, and auto-forget
- Document project profiles, timeline, export/import
- Update all stats (21 functions, 10 MCP tools, 28 endpoints, 144 tests)
- Update data model with new KV scopes (relations, profiles, embeddings, bm25)
- Update config section with embedding, fallback, and search weight env vars
* docs: add banner image to README
* docs: fix banner crop and size
Remove cream strip at bottom, cap width to 720px in README
* docs: include REST API in supported agents intro
Consistent wording in both the intro line and REST section