tui: plugins disabled in Ctrl+P Plugins dialog are re-enabled on session switch #55506

Summary

Disabling a plugin in the Plugins dialog (Ctrl+P → Plugins → Disable) only deactivates it in memory. It is not saved to cli.json, so plugins come back after a plugin reconciliation, for example when switching to another session. Users see their disabled plugins reappear.

Environment

• opencode version: 2.0.29
• OS: Darwin 25.6.0 (macOS, arm64)
• Terminal: TERM_PROGRAM=herdr, TERM=xterm-256color, COLORTERM=truecolor
• Shell: /bin/zsh
• Install/channel: latest (release)

Reproduction

1. Configure several TUI plugins in ~/.config/opencode/cli.json under plugins.
2. Open the TUI, press Ctrl+P → Plugins, and disable one or more plugins. They disappear from the UI.
3. Check ~/.config/opencode/cli.json: it is unchanged (mtime unchanged, no -<id> entries added).
4. Switch to another session (in my case, other sessions are in different working directories).
5. The disabled plugins are active again.

Expected Behavior

A plugin disabled from the Plugins dialog stays disabled. The choice should persist, for example as a -<id> entry in cli.json (the format the docs describe for disabling plugins), or the dialog should make clear that the toggle is temporary.

Actual Behavior

The toggle is session-local. Reading the 2.0.29 binary, the dialog's Disable action calls plugins.deactivate(id), which only runs the plugin's cleanups and sets it inactive in memory. The reconciliation routine rebuilds the plugin list from config every time JSON.stringify([serverTuiPlugins, config.plugins]) changes or a watched plugin directory changes. In that rebuild every plugin gets enabled: true unless config has a -id directive. The in-memory active=false is compared against enabled=true and the plugin is reactivated.

The server-side plugin list is requested per location, so switching to a session in a different directory can change it and trigger reconciliation. I confirmed that "plugin reconciliation started/completed" is logged by every running TUI process at once, but I did not verify the exact trigger on session switch.