fix: use personal token only for auto-merge

[HavenDV]

Use GITHUB_TOKEN for PR approval and PERSONAL_TOKEN only for the merge step so merge-triggered push workflows run reliably on the default branch.

Summary by CodeRabbit

• Chores
  • Updated continuous integration workflow configuration for improved automation handling.
  • Updated build and test system configuration to reference updated solution format.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c2b55589-456e-48c5-87a8-03699cc60f72

📥 Commits

Reviewing files that changed from the base of the PR and between c7329c1 and ad7f268.

📒 Files selected for processing (2)

• .github/workflows/auto-merge.yml
• CLAUDE.md

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Walkthrough

Two configuration files updated: GitHub Actions workflow changed token variable naming and sources for PR approval automation, while documentation updated solution file references from legacy .sln to .slnx format.

Changes

Cohort / File(s)	Summary
GitHub Actions Configuration .github/workflows/auto-merge.yml	Environment variable renamed from GITHUB_TOKEN to GH_TOKEN; token source changed from secrets.GITHUB_TOKEN to secrets.PERSONAL_TOKEN in second step.
Documentation CLAUDE.md	Solution file references updated from CSharpToJsonSchema.sln to CSharpToJsonSchema.slnx across all build and test command blocks.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Tokens dance and solutions gleam,
From old to new, a workflow's dream,
.slnx files replace the past,
Configuration changes built to last! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly describes the main change: switching to use personal token only for the auto-merge step while using GITHUB_TOKEN for PR approval.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/standardize-auto-merge-token

📝 Coding Plan

• Generate coding plan for human review comments

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