feat(plugin): allow agent invocation of elaborate, resume, and refine skills

Remove disable-model-invocation from elaborate, resume, and refine so the
agent can invoke these skills when signaled. Construct remains user-only
(heavyweight autonomous loop). Setup and reset remain user-only (config
and destructive operations).

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

Author: jwaldrip

plugin/skills/elaborate/SKILL.md

@@ -1,6 +1,5 @@
 ---
 description: Start AI-DLC mob elaboration to collaboratively define intent, success criteria, and decompose into units. Use when starting a new feature, project, or complex task.
-disable-model-invocation: true
 allowed-tools:
   - Read
   - Write

plugin/skills/refine/SKILL.md

@@ -1,6 +1,5 @@
 ---
 description: Refine intent or unit specs mid-construction without losing progress
-disable-model-invocation: true
 argument-hint: "[unit-slug]"
 ---
 

plugin/skills/resume/SKILL.md

@@ -1,6 +1,5 @@
 ---
 description: Resume work on an existing AI-DLC intent when ephemeral state is lost
-disable-model-invocation: true
 argument-hint: "[intent-slug]"
 ---