Fix spawn-issues to use correct subagent_type for each agent

- Issue worker: "general-purpose" → "issue-worker"
- Code reviewer: Added explicit subagent_type: "code-reviewer"
- PR fixer: Added explicit subagent_type: "pr-fixer"

Using the wrong agent type caused permission loops when spawning
background agents.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

commands/spawn-issues.md

@@ -75,7 +75,7 @@ For each issue number, spawn a background issue-worker agent and track its task_
 
 ```
 Task tool with:
-  - subagent_type: "general-purpose"
+  - subagent_type: "issue-worker"
   - run_in_background: true
   - prompt: <issue-worker prompt below>
 ```
@@ -184,6 +184,14 @@ implementing → (worker done) → reviewing → (approved) → DONE
 When spawning reviewers, pass the PR number AND branch name from the issue worker result.
 Each reviewer/fixer uses its own worktree for isolation - this prevents parallel agents from interfering with each other.
 
+**Code Reviewer:**
+```
+Task tool with:
+  - subagent_type: "code-reviewer"
+  - run_in_background: true
+  - prompt: <code-reviewer prompt below>
+```
+
 **Code Reviewer Prompt:**
 ```
 You are a code-reviewer agent. Review PR #<PR_NUMBER> autonomously.
@@ -241,10 +249,18 @@ All done!
 3 PRs created and approved
 ```
 
-## PR Fixer Prompt
+## PR Fixer
 
 When spawning pr-fixer for a PR that needs work:
 
+```
+Task tool with:
+  - subagent_type: "pr-fixer"
+  - run_in_background: true
+  - prompt: <pr-fixer prompt below>
+```
+
+**PR Fixer Prompt:**
 ```
 You are a pr-fixer agent. Address review feedback on PR #<NUMBER>.