[docs](trx-rs): codebase review - architecture docs, improvement plan, CLAUDE.md observations
Deep review of all 22 workspace crates (~52k LOC across 117 files). - docs/architecture.md: system design, crate map, data flow, concurrency model - docs/improvement-plan.md: 19 prioritized improvements (P0-P3) - CLAUDE.md: updated crate layout (added missing crates), added review observations documenting strengths and areas for improvement https://claude.ai/code/session_01CtmH5WraR6fjmt5Rx7ooEv Signed-off-by: Claude <noreply@anthropic.com>
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