Background

• We previously fixed WSL clipboard encoding issues in an earlier PR (the one you opened before), and that fix worked at the time.
• After later updates, ccb update started doing a clean reinstall flow (CCB_CLEAN_INSTALL=1), which re-applies tmux integration during install.
• In current main, tmux install logic still appends the CCB block to ~/.tmux.conf.

What Broke

• For Oh My Tmux users, writing CCB config into ~/.tmux.conf can interfere with its internal reload/apply path (_apply_configuration) and cause reload errors like return 127.
• So this is not only a local setup issue: it's a compatibility regression triggered by update/reinstall behavior.

Root Cause

1. Clipboard behavior was fixed earlier.
2. Later clean reinstall/update rewrote tmux config.
3. Installer target location (~/.tmux.conf instead of ~/.tmux.conf.local for Oh My Tmux) caused the new failure.

Fix in This PR

• Use a specific tmux marker (avoid broad marker false positives).
• Detect Oh My Tmux (TMUX_CONF_LOCAL in main config).
• Install CCB tmux block to ~/.tmux.conf.local for Oh My Tmux setups.
• Keep default behavior for non-Oh-My-Tmux setups (still ~/.tmux.conf).
• On install/uninstall, remove stale CCB blocks from both main/local files to avoid legacy leftovers.
• Improve WSL clipboard path by prioritizing pwsh / powershell.exe in paste flow and keeping UTF-8-safe PowerShell copy pipeline.

Why This Matters

• Prevents update-time regression: users who were previously fine should not break again after ccb update.
• Aligns with Oh My Tmux conventions and CCB's stated compatibility.

Validation

• bash -n install.sh
• pytest -q test/test_tmux_backend.py test/test_tmux_respawn_pane.py test/test_ccb_tmux_split.py
• Temp-HOME install simulation:
  • Oh My Tmux layout -> CCB block written to .tmux.conf.local
  • Non-Oh-My-Tmux layout -> CCB block written to .tmux.conf
  • Stale CCB block in .tmux.conf is cleaned on update