Release prep: skill v4.0.1

Bump plugin + marketplace to 4.0.1 and sync the regenerated provider
output: the guarded hook commands from issue #399 (a missing hook file
exits 0 instead of crashing every turn of a user-level install), the
canon standing exit, the visualize flow, the two shipped subagents, and
the interactive-spine fixes from today's live testing. Detector count
validates at 59 with undersized-ui-text.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.cursor/hooks.json

@@ -3,7 +3,7 @@
   "hooks": {
     "preToolUse": [
       {
-        "command": "node \".cursor/skills/impeccable/scripts/hook-before-edit.mjs\"",
+        "command": "[ ! -f \".cursor/skills/impeccable/scripts/hook-before-edit.mjs\" ] || node \".cursor/skills/impeccable/scripts/hook-before-edit.mjs\"",
         "timeout": 5
       }
     ]