fix(ci): remove --dry-run from lockfile validation

- pip-compile --dry-run doesn't create output file
- Causes diff command to fail with "No such file or directory"
- Removing --dry-run allows proper lockfile comparison

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

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

Author: blalterman

.github/workflows/publish.yml

@@ -62,7 +62,7 @@ jobs:
       - name: Verify lockfiles synced before release
         run: |
           pip install pip-tools
-          pip-compile pyproject.toml --output-file=/tmp/req-check.txt --dry-run --quiet
+          pip-compile pyproject.toml --output-file=/tmp/req-check.txt --quiet
           if ! diff -q requirements.txt /tmp/req-check.txt; then
             echo "❌ CRITICAL: requirements.txt out of sync with pyproject.toml"
             echo "Run: pip-compile pyproject.toml --output-file=requirements.txt"