ci(claude): grant write perms in claude.yml to match upstream example

The official anthropics/claude-code-action example for anthropic_api_key
requires contents/pull-requests/issues: write so the action can comment
back on @claude mentions and push when Edit/Write tools are enabled.
Bring claude.yml in line with claude-md-audit.yml (which already had
PR/issue write) and the upstream examples/claude.yml.

Resolves Devin review feedback BUG-0001 + ANALYSIS-0002 on PR 3532.

Author: ericallam

.github/workflows/claude.yml

@@ -19,9 +19,9 @@ jobs:
       (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
     runs-on: ubuntu-latest
     permissions:
-      contents: read
-      pull-requests: read
-      issues: read
+      contents: write
+      pull-requests: write
+      issues: write
       id-token: write
       actions: read # Required for Claude to read CI results on PRs
     steps: