fix(plugin): add continuation signals after fork subagent invocations

Elaboration was stalling after the discovery phase because the LLM lost
track of the workflow after the fork subagent returned. Add explicit
"DO NOT STOP HERE" directives after each Skill() fork invocation to
prevent the agent from halting mid-elaboration.

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

Author: jwaldrip

plugin/skills/elaborate/SKILL.md

@@ -333,6 +333,8 @@ provider_config: {JSON of PROVIDERS object}
 Skill("elaborate-discover", args: ".ai-dlc/{INTENT_SLUG}/.briefs/elaborate-discover.md")
 ```
 
+**CRITICAL — DO NOT STOP HERE.** Discovery is only one sub-step of elaboration. After the discovery subagent completes, you MUST immediately proceed to Step 4 below. There are many more phases remaining (Domain Model validation, Workflow Selection, Success Criteria, Decomposition, etc.). Stopping after discovery means the elaboration is incomplete.
+
 ### Step 4: Read results
 
 Read `.ai-dlc/${INTENT_SLUG}/.briefs/elaborate-discover-results.md`.
@@ -1075,6 +1077,8 @@ design_provider_type: {DESIGN_TYPE or empty}
 Skill("elaborate-wireframes", args: ".ai-dlc/{INTENT_SLUG}/.briefs/elaborate-wireframes.md")
 ```
 
+**CRITICAL — DO NOT STOP HERE.** After the wireframes subagent completes, immediately proceed to Step 5.
+
 ### Step 5: Read results
 
 Read `.ai-dlc/${INTENT_SLUG}/.briefs/elaborate-wireframes-results.md`.
@@ -1168,6 +1172,8 @@ plugin_root: {CLAUDE_PLUGIN_ROOT}
 Skill("elaborate-ticket-sync", args: ".ai-dlc/{INTENT_SLUG}/.briefs/elaborate-ticket-sync.md")
 ```
 
+**CRITICAL — DO NOT STOP HERE.** After the ticket sync subagent completes, immediately proceed to Step 4.
+
 ### Step 4: Read results
 
 Read `.ai-dlc/${INTENT_SLUG}/.briefs/elaborate-ticket-sync-results.md`.