docs(ci): describe protected reusable checks

[codeh007]

更新 CI 入口与维护规则：

• 记录 PR/main 共用只读 ci.yml
• 记录 Verify required check 与原生 auto-merge 权限边界
• 勾选 OpenSpec 任务 6.5

远端 CI 必须完整通过后才允许合并。

Summary by CodeRabbit

• Documentation
  • Clarified that Verify is required for the main branch and documented rules for enabling automatic merges.
  • Updated CI workflow references in the README for pull requests, pushes, releases, and recent-run commands.
  • Marked documentation task 6.5 as completed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8dd690de-ccea-4461-9fc6-aef6d7c23bf3

📥 Commits

Reviewing files that changed from the base of the PR and between 058fd15 and 322ea4b.

📒 Files selected for processing (3)

• MAINTAINERS.md
• README.md
• openspec/changes/extract-and-standardize-pggomtm/tasks.md

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📝 Walkthrough

Walkthrough

The changes update CI workflow documentation, define required-check and auto-merge rules for maintainers, and mark specification task 6.5 as completed.

Changes

CI and maintenance documentation

Layer / File(s)	Summary
Workflow references and merge policy README.md, MAINTAINERS.md	README now references ci.yml for CI and run-list commands; MAINTAINERS.md documents Verify and auto-merge permissions for maintainer, Dependabot, and external-contributor PRs.
Specification task status openspec/changes/extract-and-standardize-pggomtm/tasks.md	Task 6.5 is marked complete without changing its description.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: w-zz-w-zz-w

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and relates to the documented CI check and merge protection rules.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci-governance-docs

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