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/routes/hooks.js

@@ -1473,12 +1473,13 @@ function antigravityHookInput(hookType, data) {
 }
 
 /**
- * A Grok Build (`grok`) hook. Grok runs the hooks in `~/.claude/settings.json`
- * itself (its Claude compatibility, on by default), so AgentHub's own Claude
- * hook reaches here with no `tool` — told apart by the camelCase keys only
- * Grok sends beside Claude's snake_case aliases (`hookEventName`,
- * `workspaceRoot`). Its `transcript_path` is Grok's file, never a Claude
- * transcript, so it is dropped before anything could parse it.
+ * A Grok Build hook. Grok is not an AgentHub tool, but it runs the hooks in
+ * `~/.claude/settings.json` itself (its Claude compatibility, on by default),
+ * so AgentHub's own Claude hook still reaches here from a Grok the user
+ * installed, with no `tool` — told apart by the camelCase keys only Grok sends
+ * beside Claude's snake_case aliases (`hookEventName`, `workspaceRoot`) and
+ * dropped, or it would land as a Claude session whose `transcript_path` is
+ * Grok's file.
  */
 const isGrokPayload = (data) =>
   !!data &&
@@ -1486,18 +1487,9 @@ const isGrokPayload = (data) =>
   typeof data.hookEventName === "string" &&
   typeof data.workspaceRoot === "string";
 
-function grokHookInput(hookType, data) {
-  if (typeof data.session_id !== "string" || !data.session_id) return null;
-  const d = { ...data };
-  delete d.transcript_path;
-  delete d.agent_transcript_path;
-  return { hookType, data: d };
-}
-
 const HOOK_TOOLS = {
   codex: codexHookInput,
   antigravity: antigravityHookInput,
-  grok: grokHookInput,
 };
 
 /**
@@ -1564,14 +1556,11 @@ function ingestHook(body, pushSource = null, peer = { kind: "host" }) {
   }
   const ignored = { status: 200, body: { ok: true, ignored: true } };
   // Which CLI sent it: `codex` from Codex's hooks (codex-hooks.js),
-  // `antigravity` from agy's (antigravity-hooks.js), `grok` for Grok running
-  // the Claude hooks (by its payload's own keys), anything else is Claude
-  // Code — an allowlist, never a value stored as sent.
-  const tool = Object.hasOwn(HOOK_TOOLS, body.tool)
-    ? body.tool
-    : isGrokPayload(data)
-      ? "grok"
-      : "claude";
+  // `antigravity` from agy's (antigravity-hooks.js), anything else is Claude
+  // Code — an allowlist, never a value stored as sent. Grok running the
+  // Claude hooks is no AgentHub tool: dropped.
+  const tool = Object.hasOwn(HOOK_TOOLS, body.tool) ? body.tool : "claude";
+  if (tool === "claude" && isGrokPayload(data)) return ignored;
   if (tool !== "claude") {
     if (!data || typeof data !== "object") return ignored;
     require("../lib/hook-auth").dropForeignPaths(peer, data);