Promote AgentCompany-New to the repository root and retire the old app

The legacy application - its src, tests, landing site, promo assets, docs,
release tooling, CI workflows, and root configs - leaves the tree; it stays
reachable in history. Everything under AgentCompany-New moves up unchanged:
same package name, so the production userData/database path is untouched,
and e2e/build scripts already resolved paths relative to the project. The
developer cred.txt stays gitignored at its new location. Full verify:ci
passes from the new root.

src/main/services/agent-read-messages.ts

@@ -0,0 +1,74 @@
+import { optionalString } from "./agent-tool-args";
+import type { AgentToolContext, AgentToolDeps } from "./agent-tools";
+import type { JsonRecord } from "./provider-http";
+
+export function readMessagesTool(deps: AgentToolDeps, ctx: AgentToolContext, args: JsonRecord): string {
+  const channel = optionalString(args.channel);
+  const withTeammate = optionalString(args.with);
+  const limit = Math.min(Math.max(Number(args.limit) || 10, 1), 30);
+  if (channel && withTeammate) throw new Error('Pass either "channel" or "with", not both.');
+  if (withTeammate) {
+    const counterpart = deps.db.prepare(`
+      select id, name, 'agent' as kind from agents where org_id = ? and lower(name) = lower(?) and lifecycle = 'active'
+      union all
+      select id, display_name as name, 'employee' as kind from employees where org_id = ? and lower(display_name) = lower(?)
+      limit 1
+    `).get(ctx.orgId, withTeammate, ctx.orgId, withTeammate) as { id: string; name: string; kind: "agent" | "employee" } | undefined;
+    if (!counterpart) throw new Error(`No teammate named "${withTeammate}".`);
+    const spaceId = deps.chat.ensureDirectSpace(
+      ctx.orgId,
+      { type: "agent", id: ctx.agent.id },
+      { type: counterpart.kind, id: counterpart.id },
+    );
+    const rows = recentMessagesIn(deps, ctx.orgId, spaceId, limit);
+    if (rows.length === 0) return `No messages yet in your direct conversation with ${counterpart.name}.`;
+    return rows.map((m) => `[${m.sender_name}] (thread=${m.thread_id}): ${m.body_md}`).join("\n");
+  }
+  if (channel) {
+    const space = deps.db.prepare(
+      "select id from chat_spaces where org_id = ? and lower(name) = lower(?) and space_type <> 'direct' limit 1",
+    ).get(ctx.orgId, channel) as { id: string } | undefined;
+    if (!space) throw new Error(`No channel named "${channel}".`);
+    const rows = recentMessagesIn(deps, ctx.orgId, space.id, limit);
+    if (rows.length === 0) return `No recent messages in #${channel}.`;
+    return rows.map((m) => `[${m.sender_name}] (thread=${m.thread_id}): ${m.body_md}`).join("\n");
+  }
+  const rows = deps.db.prepare(`
+    select m.body_md,
+           coalesce(a.name, e.display_name, m.sender_type) as sender_name,
+           m.thread_id, s.name as channel_name, s.space_type
+    from chat_mentions cm
+    join chat_messages m on m.id = cm.message_id
+    join chat_spaces s on s.id = m.space_id
+    left join agents a on a.id = m.sender_id and m.sender_type = 'agent'
+    left join employees e on e.id = m.sender_id and m.sender_type = 'employee'
+    where cm.target_type = 'agent' and cm.target_id = ? and m.org_id = ? and m.deleted_at is null
+    order by m.created_at desc
+    limit ?
+  `).all(ctx.agent.id, ctx.orgId, limit) as Array<{ body_md: string; sender_name: string; thread_id: string; channel_name: string; space_type: string }>;
+  if (rows.length === 0) return "No recent mentions.";
+  return rows.reverse().map((m) => {
+    const where = m.space_type === "direct" ? "in your direct conversation" : `in #${m.channel_name}`;
+    return `[${m.sender_name} ${where}] (thread=${m.thread_id}): ${m.body_md}`;
+  }).join("\n");
+}
+
+function recentMessagesIn(
+  deps: AgentToolDeps,
+  orgId: string,
+  spaceId: string,
+  limit: number,
+): Array<{ body_md: string; sender_name: string; thread_id: string }> {
+  const rows = deps.db.prepare(`
+    select m.body_md,
+           coalesce(a.name, e.display_name, m.sender_type) as sender_name,
+           m.thread_id
+    from chat_messages m
+    left join agents a on a.id = m.sender_id and m.sender_type = 'agent'
+    left join employees e on e.id = m.sender_id and m.sender_type = 'employee'
+    where m.space_id = ? and m.org_id = ? and m.deleted_at is null
+    order by m.created_at desc
+    limit ?
+  `).all(spaceId, orgId, limit) as Array<{ body_md: string; sender_name: string; thread_id: string }>;
+  return rows.reverse();
+}