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/chat-service-internal.ts

@@ -0,0 +1,105 @@
+import type { DatabaseSync } from "node:sqlite";
+import type { CreateChatSpaceInput, SendMessageInput } from "../../shared/commands";
+import type { FileScanState } from "../../shared/domain";
+import { parseBoardCommand } from "./board-intervention-service";
+
+export const RETENTION_POLICIES = new Set(["standard_365d", "restricted_365d"]);
+
+export const ALLOWED_SLASH_COMMANDS = new Set([
+  "agent",
+  "handoff",
+  "approve",
+  "deny",
+  "skill",
+  "runbook",
+  "file",
+  "escalate",
+  "board",
+]);
+
+export interface FileAttachmentRow {
+  id: string;
+  sha256: string;
+  scan_state: FileScanState;
+  scan_labels_json: string;
+  storage_path: string;
+  owner_type: string;
+  owner_id: string | null;
+}
+
+export interface SpaceRow {
+  id: string;
+  org_id: string;
+  visibility: string;
+  space_type: string;
+}
+
+export interface ThreadRow {
+  id: string;
+  board_state: string;
+  controlled_by_type: "employee" | "agent" | "board" | null;
+  controlled_by_id: string | null;
+}
+
+export interface PrincipalRef {
+  type: "employee" | "agent";
+  id: string;
+}
+
+export interface SlashInvocation {
+  command: string;
+  args: string;
+}
+
+export interface ApprovalRequester {
+  type: "employee" | "agent" | "system";
+  id: string | null;
+}
+
+export function parseSlashInvocation(body: string): SlashInvocation | null {
+  const match = body.match(/^\/([a-z][a-z0-9_-]*)(?:\s+([\s\S]*))?$/i);
+  if (!match) return null;
+  return { command: match[1].toLowerCase(), args: match[2] ?? "" };
+}
+
+export function validateSlashInvocation(slash: SlashInvocation): void {
+  if (slash.command === "escalate" && slash.args.trim().length === 0) {
+    throw new Error("Slash command /escalate requires details.");
+  }
+  if (slash.command === "approve" || slash.command === "deny") parseApprovalDecisionTarget(slash);
+  if (slash.command === "board") parseBoardCommand(slash.args);
+}
+
+export function parseApprovalDecisionTarget(slash: SlashInvocation): string {
+  const approvalId = slash.args.trim().split(/\s+/, 1)[0] ?? "";
+  if (!approvalId) throw new Error(`Slash command /${slash.command} requires an approval id.`);
+  return approvalId;
+}
+
+export function firstToken(value: string): string {
+  return value.trim().split(/\s+/, 1)[0] ?? "";
+}
+
+export function approvalRequester(senderType: SendMessageInput["senderType"], sender: PrincipalRef | null): ApprovalRequester {
+  if (senderType === "system") return { type: "system", id: null };
+  if (!sender) throw new Error("Approval requester is missing.");
+  if (senderType === "agent") return { type: "agent", id: sender.id };
+  return { type: "employee", id: sender.id };
+}
+
+export function spaceName(db: DatabaseSync, spaceId: string): string {
+  const row = db.prepare("select name from chat_spaces where id = ?").get(spaceId) as { name: string } | undefined;
+  if (!row) throw new Error("Chat space was not found.");
+  return row.name;
+}
+
+export function createThreadTitle(body: string): string {
+  const firstLine = body.split(/\r?\n/, 1)[0].trim();
+  return firstLine.length > 80 ? `${firstLine.slice(0, 77)}...` : firstLine;
+}
+
+export function retentionPolicy(value: string | undefined, visibility: CreateChatSpaceInput["visibility"]): string {
+  const policy = value ?? (visibility === "restricted" ? "restricted_365d" : "standard_365d");
+  if (!RETENTION_POLICIES.has(policy)) throw new Error("Chat retention policy is invalid.");
+  return policy;
+}