fix(harness): gate kickoff/lock entry works in RPC mode (not only interactive)

- Removed event.source === "interactive" guard from entry detection so
  /nuova-domanda and /riprendi-sessione activate lockActive+pendingKickoff
  regardless of source (TUI or RPC prompt).
- Removed event.source !== "interactive" from free-input filter; lock now
  blocks/steers all user input when active, not only interactive keystrokes.
- Added typebox@1.1.38 devDep + fake_pi_runtime.registerCommand (gap from Task 2).
- New test: gate_entry.test.js (2 tests: lock activates on RPC; !-steer passes).
- Full suite: 19/19 pass, zero regressions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

harness/package-lock.json

@@ -0,0 +1,22 @@
+{
+  "name": "thothii-harness-gate",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "thothii-harness-gate",
+      "version": "0.1.0",
+      "devDependencies": {
+        "typebox": "1.1.38"
+      }
+    },
+    "node_modules/typebox": {
+      "version": "1.1.38",
+      "resolved": "https://registry.npmjs.org/typebox/-/typebox-1.1.38.tgz",
+      "integrity": "sha512-pZ0aQPmMmXoUvSbeuWf/Hzsc+avNw/Zd6VeE8CFgkVGWyuHPJvqeJJDeJqLve+K70LvjYIoleGcoJHPT17cWoA==",
+      "dev": true,
+      "license": "MIT"
+    }
+  }
+}