refactor(interactive-bash-session): extract tracker and command parser

Split hook into focused modules:
- interactive-bash-session-tracker.ts: session tracking logic
- tmux-command-parser.ts: tmux command parsing utilities

src/hooks/interactive-bash-session/index.ts

@@ -1 +1,3 @@
 export { createInteractiveBashSessionHook } from "./interactive-bash-session-hook"
+export { createInteractiveBashSessionTracker } from "./interactive-bash-session-tracker"
+export { parseTmuxCommand } from "./tmux-command-parser"