Remove the automatic installation of opencode-antigravity-auth plugin
when users have Gemini configured. This change addresses several issues:
1. Antigravity plugin is causing Google account bans for users
2. Users are unaware the plugin was auto-installed
3. Google has built-in OAuth for Gemini that doesn't require third-party plugins
Users who need the antigravity plugin can manually add it to their
plugin configuration if desired.
Fixes issues with unexpected plugin installation and account safety.
- fix(delegate-task): return error on poll timeout instead of silent null
- fix(delegate-task): ensure toast and session cleanup on all error paths with try/finally
- fix(delegate-task): apply agent tool restrictions in sync-prompt-sender
- fix(plugin): add symmetric idle dedup to prevent double hook triggers
- fix(cli): replace regex-based JSONC editing with jsonc-parser in auth-plugins
- fix(cli): abort event stream after completion and restore no-timeout default
All changes verified with tests and typecheck.
