ci: adopt reusable auto-arm-merge workflow

[chitcommit]

Summary

Adopts the reusable auto-arm-merge workflow from chittyfoundation/.github (see chittyfoundation/.github#7). On every non-draft PR open / ready_for_review / reopen, this arms 'gh pr merge --auto --squash --delete-branch'.

Squash ruleset already locked on this repo; required checks still gate the actual merge.

Skip conditions

Drafts, dependabot/renovate, titles starting with WIP/[WIP]/Draft:/DO NOT MERGE, forks.

Test plan

• After merge, open a test PR and confirm auto-merge is armed
• Open a draft PR and confirm it's skipped

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 62849e0b-c0e0-4b96-b4d8-21960b3a08eb

📥 Commits

Reviewing files that changed from the base of the PR and between cc2eaba and cfd3bb6.

📒 Files selected for processing (1)

• .github/workflows/auto-arm-merge.yml

Warning

.coderabbit.yaml has a parsing error

The CodeRabbit configuration file in this repository has a parsing error and default settings were used instead. Please fix the error(s) in the configuration file. You can initialize chat with CodeRabbit to get help with the configuration file.

💥 Parsing errors (1)

Validation error: Too big: expected string to have <=250 characters at "tone_instructions"

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/auto-arm-merge

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 5222a31184

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[chatgpt-codex-connector]

Grant write permissions to arm auto-merge

In repositories or organizations where the default GITHUB_TOKEN permissions are read-only, this caller invokes the reusable workflow without passing contents: write/pull-requests: write, so the downstream gh pr merge --auto --squash --delete-branch step cannot enable auto-merge. Reusable workflows receive the caller job's token permissions and nested workflows cannot elevate them, so add explicit permissions on this workflow/job before calling the shared workflow.

Useful? React with 👍 / 👎.