docs: require complete AI contributor PR template

[matthewevans]

Summary by CodeRabbit

• Documentation
  • Updated contribution guidance to require using the standard pull request template and completing every section.
  • Clarified how contributors should report the AI model and tier used.
  • Added structured reporting fields for scope expansion, validation failures, and CI failures.
  • Aligned README and AI contributor instructions with the updated pull request process.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: c97ba0fe-1818-44d4-b2d4-0160ff4e2296

📥 Commits

Reviewing files that changed from the base of the PR and between ff204c0 and 2ec8204.

📒 Files selected for processing (2)

• .github/PULL_REQUEST_TEMPLATE.md
• docs/AI-CONTRIBUTOR.md

📝 Walkthrough

Walkthrough

The PR updates the pull-request template with structured LLM and parse-impact metadata, then aligns contributor documentation and AI prompts to require that template and canonical model and tier fields.

Changes

PR guidance standardization

Layer / File(s)	Summary
Template metadata and impact fields .github/PULL_REQUEST_TEMPLATE.md	Adds Files changed, Track, LLM, Model, and Tier fields, and structures claimed parse impact with scope, validation, and CI subsections.
Contributor instructions alignment CONTRIBUTING.md, README.md, docs/AI-CONTRIBUTOR.md	Requires LLM contributors to use and complete the repository PR template, including canonical Model: and Tier: Frontier lines across contributor guidance and prompts.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• phase-rs/phase#6579: Updates AI contributor guidance for Frontier-tier model policy in the same documentation area.
• phase-rs/phase#6584: Expands Frontier model and tier requirements referenced by the updated contributor guidance.

🚥 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 clearly matches the change: documentation updates that require completing the AI contributor PR template.
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 ship/docs-require-complete-ai-contributor-pr-template

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.github/PULL_REQUEST_TEMPLATE.md:
- Around line 15-17: Update the default pull request template metadata section
containing “Model,” “Tier,” and “Thinking” to provide an explicit not-applicable
option for non-LLM contributors, while retaining the existing guidance for
AI-assisted submissions. Ensure contributors can complete the section truthfully
without providing fabricated Frontier model or thinking details.

In `@docs/AI-CONTRIBUTOR.md`:
- Around line 383-388: Update the embedded pull request template section in
AI-CONTRIBUTOR.md to match .github/PULL_REQUEST_TEMPLATE.md exactly, especially
the parse-diff card-name requirements and Scope Expansion guidance; remove the
conflicting optional-evidence wording rather than maintaining a divergent
duplicate.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 0854ec5b-1b90-4f38-9d2a-f1fa2e02d843

📥 Commits

Reviewing files that changed from the base of the PR and between 7ac9d51 and ff204c0.

📒 Files selected for processing (4)

• .github/PULL_REQUEST_TEMPLATE.md
• CONTRIBUTING.md
• README.md
• docs/AI-CONTRIBUTOR.md