chore(gitignore): ignore coordination ephemeral dirs + untrack workflows.db

- Add inbox_qwen/, inbox_codex/, inbox_claude/, active/ to gitignore
- Add .inbox_baseline.txt, .loop_log.txt to gitignore
- git rm --cached workflows.db (runtime data, already covered by **/instance/*.db rule)

.gitignore

@@ -126,7 +126,14 @@ tools/codex_windows_correction_rapport.py
 docs/clients/
 
 .qw-baseline.log
+# Coordination ephemeral — inbox messages, active decisions, loop state
 docs/coordination/.loop_state/
+docs/coordination/.inbox_baseline.txt
+docs/coordination/.loop_log.txt
+docs/coordination/inbox_qwen/
+docs/coordination/inbox_codex/
+docs/coordination/inbox_claude/
+docs/coordination/active/
 
 # Runtime Python embedded pour l'installateur Inno Setup (local, ~11M, non versionné)
 deploy/installer/python-3.12-embed/