fix: event-loop freezes, plugin-install boot crash, tmux attach/scrollbar, Codex transcripts

- GET /api/workflows: one LEAD() window pass in a read worker (read-pool.js,
  workflow-stats.js); idx_events_session restored, idx_events_tool added
- compat-sqlite gains function/pluck/readonly so a plugin install without a
  better-sqlite3 build boots again; antigravity-usage uses db.js's Database
- install-hooks adds no checkout hooks while the agenthub plugin is enabled
  (events were doubled)
- terminal attach runs the live tmux server's own binary; the pane scrollbar
  gets a visible 2-column style, and claude panes start with
  CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1 so tmux keeps history to scroll
- Codex sessions' conversation in GET /api/sessions/:id/transcript
- Codex/Antigravity sessions claimed by their workspace without hooks
- UI-audit follow-ups, docs and OpenAPI

server/lib/antigravity-usage.js

@@ -39,8 +39,10 @@
 
 const fs = require("node:fs");
 const path = require("node:path");
-const Database = require("better-sqlite3");
-const { db, stmts } = require("../db");
+// The driver db.js chose: better-sqlite3 has no build in a plugin install
+// (installed without scripts), and only db.js falls back to node:sqlite.
+const { db, stmts, Database } = require("../db");
+const { claimToolSessions } = require("./dashboard-runs");
 const { getAgyCliDir } = require("./antigravity-home");
 const pricingSync = require("./pricing-sync");
 
@@ -56,6 +58,9 @@ const NOT_AGYS = /SQLITE_NOTADB|SQLITE_CORRUPT|no such table/;
  * a Buffer. Throws on a malformed buffer.
  */
 function pbFields(buf) {
+  // node:sqlite hands a BLOB over as a plain Uint8Array, whose toString()
+  // ignores its encoding — model names and file URIs would decode as "1,2,3".
+  if (!Buffer.isBuffer(buf)) buf = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
   const out = [];
   let i = 0;
   const varint = () => {
@@ -359,6 +364,7 @@ function writeSession(f, conv, now) {
         lastWrite,
         JSON.stringify({ source: "antigravity-conversation" })
       );
+    claimToolSessions(id); // its workspace, before the broadcast
     // Every usage row of an Antigravity session is this module's: rewritten whole.
     clearUsage.run(id);
     for (const [m, t] of Object.entries(conv.usage)) {