Add examples of good review comments to code-review skill

Shows good vs bad comment styles for each review category:
code quality, bugs, security, style, test coverage, and positive feedback.

Closes #10

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

skills/code-review/SKILL.md

@@ -93,6 +93,53 @@ Questions to ask:
 - Acknowledge good solutions
 - Remember there's a person receiving this feedback
 
+## Example Review Comments
+
+### Code Quality
+
+**Good:**
+> `src/utils/parser.ts:45` - This function is doing three things: parsing, validating, and transforming. Consider splitting into `parse()`, `validate()`, and `transform()` to improve testability and make each responsibility clear.
+
+**Bad:**
+> This code is messy, please clean it up.
+
+### Potential Bugs
+
+**Good:**
+> `src/api/users.ts:23` - `users.find()` returns `undefined` when no match is found, but line 25 accesses `user.id` without a null check. This will throw when the user doesn't exist. Consider: `const user = users.find(...); if (!user) return null;`
+
+**Bad:**
+> This might crash.
+
+### Security
+
+**Good:**
+> `src/routes/search.ts:12` - The query parameter is interpolated directly into the SQL string, which allows SQL injection. Use parameterized queries instead: `db.query('SELECT * FROM items WHERE name = ?', [query])`
+
+**Bad:**
+> Security issue here.
+
+### Style
+
+**Good:**
+> `src/components/Button.tsx:8` - Minor: The codebase uses `camelCase` for event handlers (e.g., `handleClick`), but this uses `on_click`. Consider renaming for consistency.
+
+**Bad:**
+> Wrong naming convention.
+
+### Test Coverage
+
+**Good:**
+> The happy path is well tested. Consider adding a test for when `fetchUser()` rejects - the error handling in line 34 isn't currently covered.
+
+**Bad:**
+> Need more tests.
+
+### Positive Feedback
+
+**Good:**
+> Nice use of the builder pattern here - it makes the configuration much more readable than the previous approach with multiple boolean flags.
+
 ## Verdict Criteria
 
 ### LGTM (Looks Good To Me)