docs: add npm→Deno migration notices to AI workflow files

Add migration notices to AGENTIC.scm and PLAYBOOK.scm alerting AI agents that npm/Vitest commands are outdated. These files contain many references to the old build system which will be comprehensively updated in a future session.

Current correct commands:
- Tests: deno task test (33 tests, 719ms)
- Dev: deno task dev
- ReScript: node_modules/rescript/rescript build

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Jonathan D.A. Jewell

.machine_readable/AGENTIC.scm

@@ -6,6 +6,12 @@
   (last-updated "2026-02-07")
   (manifest-reference "0-AI-MANIFEST.a2ml")
 
+  (migration-notice
+    "⚠️  npm→Deno migration completed (2026-02-07). Some npm commands in this file are outdated."
+    "Current workflow: Use 'deno task test' (not npm run test), 'deno task dev' for development."
+    "ReScript: node_modules/rescript/rescript build"
+    "Tests: deno task test (33 tests, 719ms)")
+
   (agent-protocols
     (session-startup
       "1. Read 0-AI-MANIFEST.a2ml FIRST (mandatory, before any file operations)"

.machine_readable/PLAYBOOK.scm

@@ -5,6 +5,14 @@
   (version "1.0.0")
   (last-updated "2026-02-07")
 
+  (migration-notice
+    "⚠️  npm→Deno migration completed (2026-02-07). Many npm commands in this file are outdated."
+    "CURRENT TEST COMMAND: deno task test (not npm run test)"
+    "CURRENT DEV COMMAND: deno task dev"
+    "ReScript compilation: node_modules/rescript/rescript build (or npm run res:build still works)"
+    "Test results: 33 tests passing in 719ms with Deno.test"
+    "This file will be comprehensively updated in a future session.")
+
   (setup-procedures
     (initial-setup
       "Setting up PanLL development environment for the first time."