We recently introduced public context toggling, and this follow-up improves usability by enabling concise keymap wiring for specific context toggles. This PR adds API-level exposure and keymap action parsing so users can configure entries like toggle_context#current_file.

• Public API

  • Exposes require('opencode.api').toggle_context(context_key).
  • Delegates directly to opencode.context.toggle_context, making context toggling available through the main API surface.

• Keymap action argument suffix (#...)

  • Extends keymap action resolution to support action#arg syntax.
  • Parses the action name into:
    • resolved function name (before #)
    • inline string argument (after #)
  • Preserves existing behavior for explicit second-argument keymap entries; inline suffix is additive.

• Type/docs alignment

  • Updates keymap type annotation to document function_name#<arg> support.
  • Adds README usage example for context toggling via keymap.

• Focused coverage

  • Adds unit coverage for:
    • api.toggle_context(...) delegation.
    • keymap dispatch of toggle_context#current_file and argument propagation.

require('opencode').setup({
  keymap = {
    editor = {
      ['<leader>ocf'] = { 'toggle_context#current_file', desc = 'Toggle current file context' },
    },
  },
})

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