feat: replace $START _ status with new/resume semantics

BREAKING: All workflow YAML files must update $START._ to $START.new + $START.resume.
The resume edge prompt replaces the previously hardcoded resume message.

- evaluate.ts: remove START_ROLE/START_STATUS special case, use $status like all nodes
- thread.ts: resolveEvaluateArgs passes 'new', cmdThreadResume passes 'resume'
- validate.ts: reject '_' everywhere (no longer valid)
- validate-semantic.ts: require 'new' and 'resume' edges on $START
- All workflow YAMLs and test fixtures updated

Fixes #101

examples/analyze-topic.yaml

@@ -35,6 +35,7 @@ roles:
       required: [$status, thesis, keyPoints]
 graph:
   $START:
-    _: { role: "analyst", prompt: "Analyze the topic in the task and produce a structured summary with key points." }
+    new: { role: "analyst", prompt: "Analyze the topic in the task and produce a structured summary with key points." }
+    resume: { role: "analyst", prompt: "Review the previous analysis output and continue with additional context." }
   analyst:
     done: { role: "$END", prompt: "Analysis complete. Finish the workflow." }

examples/debate.yaml

@@ -53,7 +53,8 @@ roles:
       required: [$status, argument]
 graph:
   $START:
-    _: { role: "against", prompt: "Present your opening argument against the proposition." }
+    new: { role: "against", prompt: "Present your opening argument against the proposition." }
+    resume: { role: "against", prompt: "Review the previous debate output and continue the argument against the proposition." }
   against:
     conceded: { role: "$END", prompt: "The against side conceded. Debate over." }
     continue: { role: "for", prompt: "Counter the opposing argument: {{{argument}}}" }

examples/eval-simple.yaml

@@ -25,6 +25,7 @@ roles:
       required: [$status, summary]
 graph:
   $START:
-    _: { role: "fixer", prompt: "Fix the code issue described in the task prompt." }
+    new: { role: "fixer", prompt: "Fix the code issue described in the task prompt." }
+    resume: { role: "fixer", prompt: "Review the previous run output and continue fixing the code issue." }
   fixer:
     done: { role: "$END", prompt: "Fix complete." }

examples/solve-issue.yaml

@@ -215,7 +215,8 @@ roles:
           required: [$status, error]
 graph:
   $START:
-    _: { role: "planner", prompt: "Analyze the issue and produce an implementation plan." }
+    new: { role: "planner", prompt: "Analyze the issue and produce an implementation plan." }
+    resume: { role: "planner", prompt: "Review the previous run output and continue the work." }
   planner:
     insufficient_info: { role: "$SUSPEND", prompt: "信息不足，需要补充：{{{reason}}}" }
     ready: { role: "developer", prompt: "Implement the TDD test spec (CAS hash: {{{plan}}}) in repo {{{repoPath}}}." }