chore: update solve-issue workflow to use $SUSPEND for insufficient_info

- .workflows/solve-issue.yaml
- examples/solve-issue.yaml
- workflows/solve-issue.yaml

All planner insufficient_info routes now use $SUSPEND instead of $END.

Closes #592

.workflows/solve-issue.yaml

@@ -228,7 +228,7 @@ graph:
   $START:
     _: { role: "planner", prompt: "Analyze the issue and produce an implementation plan." }
   planner:
-    insufficient_info: { role: "$END", prompt: "Insufficient information to proceed; end the workflow." }
+    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}}}. Repo remote: {{{repoRemote}}}." }
   developer:
     done: { role: "reviewer", prompt: "Review branch {{{branch}}} at {{{worktree}}} for code standards compliance. Repo remote: {{{repoRemote}}}." }

examples/solve-issue.yaml

@@ -216,7 +216,7 @@ graph:
   $START:
     _: { role: "planner", prompt: "Analyze the issue and produce an implementation plan." }
   planner:
-    insufficient_info: { role: "$END", prompt: "Insufficient information to proceed; end the workflow." }
+    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}}}." }
     continue: { role: "developer", prompt: "Continue work on existing branch {{{branch}}} at worktree {{{worktree}}}. Implement the revised TDD test spec (CAS hash: {{{plan}}}) in repo {{{repoPath}}}. Do NOT create a new branch or worktree — cd into the existing worktree and work there." }
   developer:

workflows/solve-issue.yaml

@@ -285,8 +285,8 @@ graph:
       prompt: Analyze the issue and produce an implementation plan.
   planner:
     insufficient_info:
-      role: $END
-      prompt: Insufficient information to proceed; end the workflow.
+      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}}}. Repo remote: {{{repoRemote}}}.'