chore(ci): pin Claude workflows to claude-opus-4-8

The claude-code-review and @claude workflows had no model pinned, so they
ran on the claude-code-action default tier. Pin them to claude-opus-4-8
(latest) for stronger code-review bug-finding.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: riglar

.github/workflows/claude-code-review.yml

@@ -52,7 +52,7 @@ jobs:
           # doesn't reach the inline-comment MCP tool: PR #9's review hit 46
           # permission denials and posted nothing despite finding issues.
           claude_args: |
-            --allowedTools "mcp__github_inline_comment__create_inline_comment,Bash(gh issue view:*),Bash(gh search:*),Bash(gh issue list:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"
+            --model claude-opus-4-8 --allowedTools "mcp__github_inline_comment__create_inline_comment,Bash(gh issue view:*),Bash(gh search:*),Bash(gh issue list:*),Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*),Bash(gh pr list:*)"
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
 

.github/workflows/claude.yml

@@ -43,7 +43,9 @@ jobs:
           # Optional: Give a custom prompt to Claude. If this is not specified, Claude will perform the instructions specified in the comment that tagged it.
           # prompt: 'Update the pull request description to include a summary of changes.'
 
-          # Optional: Add claude_args to customize behavior and configuration
+          claude_args: '--model claude-opus-4-8'
+
+          # Optional: Add more claude_args to customize behavior and configuration
           # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
           # or https://code.claude.com/docs/en/cli-reference for available options
           # claude_args: '--allowed-tools Bash(gh pr *)'