feat(ai-tools): drop OpenCode and Grok Build

- opencode.json / grok.json leave the built-in catalog; opencode-usage.js,
  its poller, transcript branch and table creation go with it (existing
  tables and session rows stay as history).
- A Grok payload reaching the Claude hook route (Grok runs the Claude hooks
  itself) is dropped instead of recorded as tool = 'grok'.
- quota.js no longer reads Grok or OpenCode Go logins.
- Redone on v2.8.22 from c6b2892 (feat/grok-usage, never merged).

server/__tests__/grok-hook-route.test.js

@@ -2,10 +2,10 @@
  * @file Tests POST /api/hooks/event for a hook Grok Build fired through the
  * Claude hooks in `~/.claude/settings.json` (Grok's Claude compatibility): it
  * arrives with no `tool`, is told apart by the camelCase keys only Grok sends
- * (`hookEventName`, `workspaceRoot`), and lands as a `tool = 'grok'` session
- * on the grok workspace — never the claude one sharing the directory — with
- * its `transcript_path` dropped. A Claude hook is left Claude's. The DB lives
- * in a temp dir.
+ * (`hookEventName`, `workspaceRoot`), and dropped — Grok is not an AgentHub
+ * tool, and taken as Claude's it would bind the claude workspace and name a
+ * Grok file as a Claude transcript. A Claude hook is left Claude's. The DB
+ * lives in a temp dir.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -58,23 +58,18 @@ const grokData = (id, extra = {}) => ({
 });
 
 describe("Grok hooks through the Claude settings", () => {
-  it("records a grok session, on the grok workspace, with no transcript path", async () => {
+  it("drops a Grok hook: no session, no event, no workspace bound", async () => {
     const claudeLane = lanes.createLane({ title: "c", cwd: CWD, tool: "claude" });
-    const grokLane = lanes.createLane({ title: "g", cwd: CWD, tool: "grok" });
     const id = "0199f0aa-1111-7222-8333-444455556666";
-    await post({ hook_type: "SessionStart", data: grokData(id) });
+    const r = await post({ hook_type: "SessionStart", data: grokData(id) });
+    assert.equal(r.ignored, true);
     await post({
       hook_type: "UserPromptSubmit",
       data: grokData(id, { hookEventName: "user_prompt_submit", prompt: "fix the bug" }),
     });
-    const s = db.prepare("SELECT * FROM sessions WHERE id = ?").get(id);
-    assert.equal(s.tool, "grok");
-    assert.equal(s.transcript_path, null);
-    const events = db.prepare("SELECT data FROM events WHERE session_id = ?").all(id);
-    assert.ok(events.length >= 1);
-    for (const e of events) assert.equal(JSON.parse(e.data).transcript_path, undefined);
+    assert.equal(db.prepare("SELECT * FROM sessions WHERE id = ?").get(id), undefined);
+    assert.equal(db.prepare("SELECT COUNT(*) n FROM events WHERE session_id = ?").get(id).n, 0);
     assert.equal(lanes.getLane(claudeLane.id).session_id, null);
-    assert.equal(lanes.getLane(grokLane.id).session_id, id);
   });
 
   it("leaves a Claude hook Claude's", async () => {