chore(commands): add individual reply instructions to review-pr skill

Add explicit gh api endpoint for replying to individual PR review
comments instead of posting general review comments.

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

Author: hyochan

.claude/commands/review-pr.md

@@ -60,10 +60,32 @@ Fixed in abc1234 along with other review items.
 
 ## Workflow
 
-1. Fetch PR comments: `gh pr view <number> --comments`
-2. Review each comment and understand the requested change
-3. Make the necessary code changes
-4. Run relevant build commands based on changed files
-5. Commit with descriptive message referencing the review
-6. Push changes
-7. Reply to each comment with the fix commit hash (no backticks!)
+1. Fetch PR review comments (code-level comments):
+
+   ```bash
+   gh api repos/{owner}/{repo}/pulls/{number}/comments
+   ```
+
+   This returns individual review comments with their `id` fields needed for replies.
+
+2. Also fetch general PR comments if needed:
+
+   ```bash
+   gh pr view <number> --comments
+   ```
+
+3. Review each comment and understand the requested change
+
+4. Make the necessary code changes
+
+5. Run relevant build commands based on changed files
+
+6. Commit with descriptive message referencing the review
+
+7. Push changes
+
+8. Reply to **each individual review comment** using the comment's `id`:
+   ```bash
+   gh api repos/{owner}/{repo}/pulls/comments/{comment_id}/replies -f body="Fixed in abc1234."
+   ```
+   **IMPORTANT:** Always reply directly to individual comments, NOT as a general PR review comment. Use the `/pulls/comments/{id}/replies` endpoint, NOT `gh pr review --comment`.