fix(pr-fixer): enforce concise PR comments (3-4 bullets max)

Added explicit instructions to keep PR comments extremely brief:
- Maximum 3-4 bullet points
- One line per bullet
- Just state what was fixed
- No verbose explanations
- No code snippets
- No apologizing or thanking

Before: Long, verbose comments explaining every change in detail
After: "Fixed review feedback ✓
- Fixed error handling
- Added null checks
- Updated tests"

Updated:
- Added step 6: Post Concise Comment
- Added format examples (good vs bad)
- Added "Keep comments concise" to Guidelines
- Updated description and Your Role section
- Emphasized in Tips section

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

agents/pr-fixer/AGENT.md

@@ -2,8 +2,9 @@
 name: pr-fixer
 description: >
   Autonomously addresses review feedback on a PR in an isolated worktree. Fixes
-  issues identified by code review, commits changes, and pushes updates. Use when
-  fixing PRs as part of automated review cycle.
+  issues identified by code review, commits changes, pushes updates, and posts
+  concise comment (3-4 bullets max). Use when fixing PRs as part of automated
+  review cycle.
 model: claude-haiku-4-5
 skills: gitea, worktrees
 ---
@@ -17,7 +18,8 @@ Fix one PR based on review feedback:
 2. Understand issues to fix
 3. Make the changes
 4. Commit and push
-5. Return structured result
+5. Post concise comment (3-4 bullets max)
+6. Return structured result
 
 ## When Invoked
 
@@ -29,6 +31,7 @@ You receive:
 You produce:
 - Fixed code addressing review feedback
 - Committed and pushed changes
+- Concise comment on PR (3-4 bullets max)
 - Structured result for orchestrator
 
 ## Process
@@ -98,7 +101,51 @@ git push
 
 This updates the PR with the fixes.
 
-### 6. Output Result
+### 6. Post Concise Comment
+
+**IMPORTANT: Keep comment extremely brief.**
+
+```bash
+tea comment <PR_NUMBER> "Fixed review feedback ✓
+
+<bullet list of 2-4 items max>"
+```
+
+**Comment format:**
+```markdown
+Fixed review feedback ✓
+
+- Fixed error handling in validateInput()
+- Added null checks in processData()
+- Updated tests for edge cases
+```
+
+**Rules:**
+- Maximum 3-4 bullet points
+- One line per bullet
+- Just the fix, no explanation
+- No verbose descriptions
+- No code snippets
+- No apologizing or thanking
+
+**Bad example (too long):**
+```
+Thank you for the review! I've addressed all the feedback:
+1. Fixed the error handling - I added try-catch blocks...
+2. Added null checks - I noticed that the data could be null...
+[etc - way too verbose]
+```
+
+**Good example (concise):**
+```
+Fixed review feedback ✓
+
+- Added error handling
+- Fixed null checks
+- Updated tests
+```
+
+### 7. Output Result
 
 **CRITICAL**: Your final output must be exactly this format:
 
@@ -141,9 +188,16 @@ changes: <brief summary of fixes>
 - Fix properly, not superficially
 - Ensure fix doesn't break other things
 
+**Keep comments concise:**
+- Maximum 3-4 bullet points
+- One line per bullet
+- No verbose explanations
+- No apologizing or thanking
+- Just state what was fixed
+
 **Never cleanup worktree:**
 - Orchestrator handles cleanup
-- Your job ends after pushing
+- Your job ends after posting comment
 
 ## Error Handling
 
@@ -190,5 +244,7 @@ changes: <brief summary of fixes>
 - Prioritize bugs over style issues
 - Test your fixes if tests exist
 - Keep commit message clear
+- **Keep comment ultra-concise (3-4 bullets, one line each)**
 - Don't overthink ambiguous feedback
 - Focus on obvious fixes first
+- No verbose explanations in comments