feat(opencode): leader keybind, explicit unmount on switch, non-wrapping indicator

Three improvements taken from reading the sibling opencode branches
(feat/opencode-extension-abhishek in particular):

- `<leader>m` opens the project picker. Switching is the repeated action and
  typing `/mcpctl` every time is friction; the other two commands stay
  palette-only.

- A switch disconnects before re-adding. `mcp.add` under the same name does
  re-point the tools on its own, but leaves it to opencode whether the previous
  client is closed — and an abandoned one keeps its `mcp-session-id` alive on
  mcplocal, which is exactly what holds a gated project open. Best-effort, so a
  first mount still works.

- The footer label renders `wrapMode="none" truncate`. The home prompt row is
  narrow enough that the default wrap broke `mcpctl:homeautomation` across two
  lines mid-word; clipping the tail of a long name reads far better.

Verified against opencode 1.18.15: ctrl-x m opens the picker, the home footer is
now one line, and a disconnect-then-add switch still lands — the model called
`mcpctl_begin_session` and listed the new project's tools.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BVwuCjuMoA13gmzYEfcrNP

src/cli/tests/config/opencode-extension-embed.test.ts

@@ -67,6 +67,22 @@ describe('embedded opencode plugins', () => {
     expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain("'--agent', 'opencode'");
   });
 
+  it('bind the switcher to a chord as well as a slash command', () => {
+    // Switching is the repeated action; typing /mcpctl every time is friction.
+    expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain("slashName: 'mcpctl'");
+    expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain("key: '<leader>m'");
+  });
+
+  it('tear the outgoing mount down before re-pointing it', () => {
+    // An abandoned client keeps its mcp-session-id — and a gated project's
+    // unlocked state — alive on mcplocal.
+    expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain('mcp.disconnect({ name: SERVER_NAME })');
+  });
+
+  it('clip rather than wrap the footer label on the narrow home prompt', () => {
+    expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain('wrapMode="none"');
+  });
+
   it('switch without rewriting the plugin file opencode has already loaded', () => {
     expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain("'--skip-plugin'");
     expect(OPENCODE_TUI_PLUGIN_SOURCE).toContain("'--skip-marker'");

src/opencode-ext/mcpctl-opencode-tui.tsx

@@ -134,6 +134,16 @@ const tui = async (api: TuiPluginApi): Promise<void> => {
     const token = state.tokens?.[project] ?? '';
     const headers: Record<string, string> = {};
     if (token !== '') headers['Authorization'] = `Bearer ${token}`;
+    // Tear the outgoing mount down explicitly. `mcp.add` under the same name
+    // does re-point the tools, but leaves it to opencode whether the previous
+    // client is closed — and an abandoned one keeps its `mcp-session-id` alive
+    // on mcplocal, which is what holds a gated project open. Best-effort: on a
+    // first mount there is nothing to disconnect.
+    try {
+      await api.client.mcp.disconnect({ name: SERVER_NAME });
+    } catch {
+      /* not mounted yet */
+    }
     await api.client.mcp.add({
       name: SERVER_NAME,
       config: {
@@ -266,6 +276,11 @@ const tui = async (api: TuiPluginApi): Promise<void> => {
         },
       },
     ],
+    // Switching is the thing you do repeatedly, so it gets a chord as well as
+    // `/mcpctl`. The other two commands stay palette-only — they are occasional.
+    bindings: [
+      { key: '<leader>m', group: 'mcpctl', desc: 'switch mcpctl project', cmd: 'mcpctl.switch' },
+    ],
   });
 
   // The indicator. `session_prompt_right` and `home_prompt_right` are the only
@@ -274,8 +289,13 @@ const tui = async (api: TuiPluginApi): Promise<void> => {
   // above the token counter. (`home_footer` would sit on the counter's line but
   // *replaces* the cwd/version footer rather than adding to it, and
   // `app_bottom` costs a whole extra terminal row.)
+  // wrapMode="none" + truncate: the home prompt row is narrow, and the default
+  // wrap breaks "mcpctl:homeautomation" across two lines mid-word. Clipping the
+  // tail of a long name reads far better than a two-line footer.
   const Indicator = (): JSX.Element => (
-    <text fg={api.theme.current.textMuted}>{api.kv.get(KV_LABEL, indicatorLabel(null))}</text>
+    <text fg={api.theme.current.textMuted} wrapMode="none" truncate>
+      {api.kv.get(KV_LABEL, indicatorLabel(null))}
+    </text>
   );
   api.slots.register({
     order: 100,