Add event-driven tasks via Gitea webhooks

Webhook endpoint at /api/webhooks/gitea receives Gitea status events,
matches them against configurable event triggers with conditions
(event type, repo glob, state, context), renders task templates with
{{variable}} substitution, and creates harness tasks automatically.

Includes circuit breaker: after N consecutive task failures from the
same trigger (default 3), the trigger auto-disables. Re-enable
manually via PATCH /api/event-triggers/:id.

New tables: harness_event_triggers (rules + circuit breaker state),
harness_event_log (audit trail + dedup via X-Gitea-Delivery).

apps/harness/scripts/build-mcp.mjs

@@ -0,0 +1,19 @@
+import { build } from "esbuild";
+import { resolve, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+await build({
+  entryPoints: [resolve(__dirname, "../src/mcp-server.ts")],
+  bundle: true,
+  platform: "node",
+  target: "node20",
+  format: "esm",
+  outfile: resolve(__dirname, "../dist/mcp-server.mjs"),
+  external: [],
+  banner: { js: "#!/usr/bin/env node" },
+  // Inline all deps — the output is a self-contained script
+});
+
+console.log("Built dist/mcp-server.mjs");