docs: comprehensive documentation update (spec 21)

[DarlingtonDeveloper]

Summary

• README.md rewritten with "self-organizing" positioning, competitive table (Mem0/Zep/Cognee/Letta/Engram replacing Chroma/pgvector), updated architecture diagram
• 15 existing docs updated with temporal validity, trust scoring, entity resolution, briefing roles/scope, configurable auto-linker rules
• 8 new docs created: 3 concept docs (self-organizing memory, trust scoring, entity resolution), 3 agent guides (coding, research, browser), 2 blog posts (vs Mem0, vs Zep)
• CHANGELOG.md has 0.3.0 entry covering all evolution features
• cortex.example.toml includes [trust], [trust.weights], entity promotion config

Files changed (23)

Updated: README.md, CHANGELOG.md, CLAUDE.md, ARCHITECTURE.md, cortex.example.toml, graph-model.md, briefings.md, auto-linker.md, decay-and-memory.md, hybrid-search.md, multi-agent.md, config.md, cli.md, http-api.md, grpc-api.md

Created: self-organizing-memory.md, trust-scoring.md, entity-resolution.md, coding-agent.md, research-agent.md, browser-agent.md, cortex-vs-mem0.md, cortex-vs-zep.md

Test plan

• Verify no broken internal doc links
• Confirm README renders correctly on GitHub
• Check all TOML config examples are valid
• Verify no references to Chroma/pgvector as primary competitors in updated files
• Verify briefing docs describe roles and scope, not hardcoded sections

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