dev-inf: Use GITHUB_TOKEN for Claude Code review action

The action's OIDC token exchange is failing, likely because the GitHub
app isn't configured to accept OIDC tokens from this workflow. By
explicitly providing the built-in GITHUB_TOKEN, we bypass the OIDC
exchange entirely.

The built-in token has sufficient permissions for PR analysis and
commenting, which is all this workflow needs.

Release note: None
Epic: None

Author: ajstorm

.github/workflows/pr-analyzer-threestage.yml

@@ -29,6 +29,7 @@ jobs:
         id: stage1
         uses: cockroachdb/claude-code-action@v1
         with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           use_vertex: "true"
           claude_args: |
             --model claude-sonnet-4-5-20250929
@@ -63,6 +64,7 @@ jobs:
         if: contains(steps.stage1.outputs.result, 'STAGE1_RESULT - POTENTIAL_BUG_DETECTED')
         uses: cockroachdb/claude-code-action@v1
         with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           use_vertex: "true"
           claude_args: |
             --model claude-4-5-sonnet-20250929
@@ -98,6 +100,7 @@ jobs:
         if: contains(steps.stage2.outputs.result, 'STAGE2_RESULT - POTENTIAL_BUG_DETECTED')
         uses: cockroachdb/claude-code-action@v1
         with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           use_vertex: "true"
           claude_args: |
             --model claude-4-5-sonnet-20250929
@@ -147,6 +150,7 @@ jobs:
         if: always()
         uses: cockroachdb/claude-code-action@v1
         with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           use_vertex: "true"
           claude_args: |
             --model claude-4-5-sonnet-20250929