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>

.codex/hooks.json

@@ -6,7 +6,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "node \".agents/skills/impeccable/scripts/hook.mjs\"",
+            "command": "[ ! -f \".agents/skills/impeccable/scripts/hook.mjs\" ] || node \".agents/skills/impeccable/scripts/hook.mjs\"",
             "timeout": 5,
             "statusMessage": "Checking UI changes"
           }
@@ -18,7 +18,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "node \".agents/skills/impeccable/scripts/hook.mjs\"",
+            "command": "[ ! -f \".agents/skills/impeccable/scripts/hook.mjs\" ] || node \".agents/skills/impeccable/scripts/hook.mjs\"",
             "timeout": 30,
             "statusMessage": "Design deep pass"
           }