fix: support grouped tmux sessions in session_map routing

[dwong777]

Summary

Adds support for grouped tmux sessions (created via tmux new-session -t <target>). Previously, the session_map was keyed by session_name:window_id and the monitor/session manager only read entries matching the configured tmux_session_name prefix. With grouped sessions, windows are shared across all sessions in the group, and the SessionStart hook can fire under any of the group's session names — causing entries to be written under unpredictable prefixes that the monitor never reads.

Symptom: Messages from Claude Code are not relayed to Telegram even though the session is connected (outbound messages and status polling work fine).

Changes

• Hook (hook.py): Clean up duplicate session_map.json entries for the same window_id across different session name prefixes, so only one entry exists per window
• SessionMonitor (session_monitor.py): Accept entries from any session name prefix when loading session_map.json (window IDs are globally unique in tmux)
• SessionManager (session.py): Same prefix-agnostic loading in load_session_map() and _cleanup_stale_session_map_entries()

Test plan

• Create a grouped tmux session (tmux new-session -t ccbot -s ccbot2)
• Start Claude Code in a shared window
• Verify the hook writes a single entry (no duplicates across prefixes)
• Verify the monitor picks up messages regardless of which session name the hook used

🤖 Generated with Claude Code

[dwong777]

An example of how our mapping looks like on a restart with grouped tmux sessions

douglas@douglas-mbp ccmux % tmux display-message -t %0 -p "#{session_name}:#{window_id}:#{window_name}"
ccbot1:@0:__main__
douglas@douglas-mbp ccmux % tmux display-message -t %1 -p "#{session_name}:#{window_id}:#{window_name}"
ccbot1:@1:Claude-1-Startup
douglas@douglas-mbp ccmux % tmux display-message -t %2 -p "#{session_name}:#{window_id}:#{window_name}"
::
douglas@douglas-mbp ccmux % tmux display-message -t %3 -p "#{session_name}:#{window_id}:#{window_name}"
ccbot1:@3:Claude-2-Startup
douglas@douglas-mbp ccmux % tmux display-message -t %4 -p "#{session_name}:#{window_id}:#{window_name}"
ccbot1:@4:Claude-3-Startup
douglas@douglas-mbp ccmux % tmux display-message -t %5 -p "#{session_name}:#{window_id}:#{window_name}"
ccbot1:@5:Claude-4-Startup

[dwong777]

Reminder to self, to have this consistently work I:

1. Need to start ccbot process first
2. Then start all the individual Claude Code tmux windows
3. And finally start the grouped tmux sessions that view each individual tmux window