refactor: move source files into workspace crates

- Move src/* into crates/tui/src/ to create a proper workspace structure
- Add .claude/ and .trimtab/ directories for Trimtab closed-loop workflow
- Add DEPENDENCY_GRAPH.md and update documentation
- Update Cargo.toml files to reflect new crate dependencies
- Update CI workflows and npm package scripts
- All tests pass, release build works

.gitignore

@@ -46,6 +46,7 @@ tmp/
 
 # Local dev scripts and temp files
 *.sh
+!scripts/**
 test.txt
 TODO*.md
 todo*.md
@@ -64,6 +65,7 @@ docs/rlm-paper.txt
 # Local runtime state
 .deepseek/
 session_*.json
+*.db
 
 # Companion app (tracked separately)
 apps/