Read Claude model from CLAUDE_MODEL repository variable

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ev8NeVB2tC9Go7ns6oAGUL

Author: ondrejmirtes

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

@@ -360,7 +360,7 @@ jobs:
           git config user.name "phpstan-bot"
           git config user.email "ondrej+phpstanbot@mirtes.cz"
 
-          claude --model claude-opus-4-8 \
+          claude --model "${{ vars.CLAUDE_MODEL }}" \
             --dangerously-skip-permissions \
             --output-format text \
             -p "$PROMPT" \

.github/workflows/claude-update-error-docs.yml

@@ -51,7 +51,7 @@ jobs:
           git config user.name "phpstan-bot"
           git config user.email "ondrej+phpstanbot@mirtes.cz"
 
-          claude --model claude-opus-4-8 \
+          claude --model "${{ vars.CLAUDE_MODEL }}" \
           --dangerously-skip-permissions \
           -p "$(cat << 'PROMPT_EOF'
             You are generating documentation pages for PHPStan error identifiers. PHPStan is a PHP static analysis tool that finds bugs in code without running it. Each error identifier (like `argument.type`, `deadCode.unreachable`, `property.notFound`) categorizes a specific type of error.