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__/quota.test.js

@@ -7,8 +7,8 @@
  * with the usage of a token that belongs to a different account; each
  * tool's plan name; the Cursor CLI's login asked of cursor.com only while
  * valid; Antigravity's `agy --print /usage` pools, never on an old agy; and
- * the Grok, Kimi Code and OpenCode Go logins, each sent only to its own host
- * while valid, never refreshed.
+ * the Kimi Code login, sent only to its own host while valid, never
+ * refreshed.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -22,8 +22,8 @@ process.env.XDG_CONFIG_HOME = require("node:fs").mkdtempSync(
 );
 // Nor run the machine's real agy: only the Antigravity test's fake one runs.
 process.env.AGENTHUB_AGY_USAGE = "0";
-// Nor its real Grok, Kimi or OpenCode logins.
-for (const k of ["GROK_HOME", "KIMI_CODE_HOME", "XDG_DATA_HOME"]) {
+// Nor its real Kimi login.
+for (const k of ["KIMI_CODE_HOME"]) {
   process.env[k] = require("node:fs").mkdtempSync(
     require("node:path").join(require("node:os").tmpdir(), "quota-home-")
   );
@@ -416,68 +416,6 @@ function stubFetch(answers) {
   return { asked, restore: () => (global.fetch = prev) };
 }
 
-test("Grok: the CLI's own auth.x.ai session asks cli-chat-proxy for credits + plan, never past expiry", async () => {
-  const fs = require("node:fs");
-  const path = require("node:path");
-  const { quotas, __resetCache } = require("../lib/quota");
-  const auth = path.join(process.env.GROK_HOME, "auth.json");
-  const f = stubFetch({
-    "https://cli-chat-proxy.grok.com/v1/billing?format=credits": [
-      200,
-      {
-        config: {
-          creditUsagePercent: 12,
-          currentPeriod: { end: "2099-01-08T00:00:00Z" },
-          subscriptionTier: "SuperGrok",
-          monthlyLimit: { val: "200" },
-          used: { val: "50" },
-          billingPeriodEnd: "2099-02-01T00:00:00Z",
-        },
-      },
-    ],
-  });
-  const grok = async () => (await quotas()).tools.find((t) => t.id === "grok");
-  try {
-    __resetCache();
-    assert.strictEqual(await grok(), undefined);
-    const later = new Date(Date.now() + 3600_000).toISOString();
-    fs.writeFileSync(
-      auth,
-      JSON.stringify({
-        "https://other.example": { key: "tok-other", expires_at: later },
-        "https://auth.x.ai": { key: "tok-x", user_id: "u1", email: "g@x.ai", expires_at: later },
-      })
-    );
-    __resetCache();
-    assert.deepStrictEqual(await grok(), {
-      id: "grok",
-      active: true,
-      account: "g@x.ai",
-      plan: "SuperGrok",
-      expiresAt: later,
-      windows: [
-        { label: "wk", usedPercent: 12, resetsAt: "2099-01-08T00:00:00.000Z" },
-        { label: "mo", usedPercent: 25, resetsAt: "2099-02-01T00:00:00.000Z" },
-      ],
-    });
-    assert.deepStrictEqual(
-      f.asked.filter((a) => a.includes("grok.com")),
-      ["https://cli-chat-proxy.grok.com/v1/billing?format=credits Bearer tok-x"]
-    );
-    fs.writeFileSync(
-      auth,
-      JSON.stringify({ "https://auth.x.ai": { key: "tok-x", expires_at: "2000-01-01T00:00:00Z" } })
-    );
-    __resetCache();
-    assert.strictEqual((await grok()).error, "ETOKENEXPIRED");
-    assert.strictEqual(f.asked.filter((a) => a.includes("grok.com")).length, 1);
-  } finally {
-    f.restore();
-    fs.rmSync(auth, { force: true });
-    __resetCache();
-  }
-});
-
 test("Kimi Code: the CLI's own token asks api.kimi.com/coding for 5h, week and month", async () => {
   const fs = require("node:fs");
   const path = require("node:path");
@@ -532,55 +470,3 @@ test("Kimi Code: the CLI's own token asks api.kimi.com/coding for 5h, week and m
     __resetCache();
   }
 });
-
-test("OpenCode Go: opencode's own `opencode-go` key asks opencode.ai for its meters", async () => {
-  const fs = require("node:fs");
-  const path = require("node:path");
-  const { quotas, __resetCache } = require("../lib/quota");
-  const dir = path.join(process.env.XDG_DATA_HOME, "opencode");
-  fs.mkdirSync(dir, { recursive: true });
-  const file = path.join(dir, "auth.json");
-  const f = stubFetch({
-    "https://opencode.ai/zen/go/v1/usage": [
-      200,
-      {
-        usage: {
-          rolling: { percent: 10, resetsAt: "2099-01-01T05:00:00Z" },
-          weekly: { percent: 55.5, resetsAt: "2099-01-07T00:00:00Z" },
-        },
-      },
-    ],
-  });
-  const go = async () => (await quotas()).tools.find((t) => t.id === "opencode");
-  try {
-    __resetCache();
-    // A login with no Go key (Copilot through opencode, say) is no row.
-    fs.writeFileSync(file, JSON.stringify({ "github-copilot": { type: "oauth", access: "a" } }));
-    assert.strictEqual(await go(), undefined);
-    fs.writeFileSync(
-      file,
-      JSON.stringify({
-        "opencode-go": { type: "api", key: "sk-go" },
-        other: { type: "api", key: "x" },
-      })
-    );
-    __resetCache();
-    assert.deepStrictEqual(await go(), {
-      id: "opencode",
-      active: true,
-      plan: "Go",
-      windows: [
-        { label: "5h", usedPercent: 10, resetsAt: "2099-01-01T05:00:00.000Z" },
-        { label: "wk", usedPercent: 55.5, resetsAt: "2099-01-07T00:00:00.000Z" },
-      ],
-    });
-    assert.deepStrictEqual(
-      f.asked.filter((a) => a.includes("opencode")),
-      ["https://opencode.ai/zen/go/v1/usage Bearer sk-go"]
-    );
-  } finally {
-    f.restore();
-    fs.rmSync(file, { force: true });
-    __resetCache();
-  }
-});