Gitignore claude-code-action's .claude-pr/ scratch dir

PR #759 got a bad "Add upstream-release-docs content for toolhive
v0.23.1" commit carrying 17 files of leakage from
.claude-pr/.claude/* + .claude-pr/CLAUDE.md + .claude-pr/.husky/.
That directory is created by anthropics/claude-code-action@v1 as
scratch workspace during skill runs — it clones our own .claude/
skill configs into a sibling dir for its own use. None of it
belongs on the repo's main branch.

Our workflow's "Commit and push" step runs `git add -A` after the
skill, which scooped up the scratch dir alongside any legitimate
content.

Ignoring /.claude-pr at the root so it never gets staged. The legit
content from the skill (guide updates, v1alpha1 → v1beta1 migration
docs) lands as intended via claude-code-action's own auto-commit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: rdimitrov

.gitignore

@@ -27,3 +27,9 @@ yarn-error.log*
 /GAPS.md
 /NO_CHANGES.md
 .claude/scheduled_tasks.lock
+
+# Scratch workspace claude-code-action creates during skill runs.
+# Contains a duplicate of .claude/ plus CLAUDE.md and husky hooks;
+# none of it belongs in the repo. First seen leaking into PR #759 when
+# our workflow's `git add -A` swept it up after the skill step.
+/.claude-pr