Get check runs

[kaitlin-duolingo]

Summary

Add get_check_runs method to the pull_request_read tool to fetch CI/CD check run status for a pull request's head commit.

Why

Fixes #1942

AI tools cannot easily determine which CI/CD checks are failing on a pull request. The existing get_status method returns combined commit status but not individual check runs (GitHub Actions jobs, third-party checks).

What changed

• Added get_check_runs as option 8 in pull_request_read method enum
• Added GetPullRequestCheckRuns function using GitHub Checks API
• Added MinimalCheckRun and MinimalCheckRunsResult types to reduce response size
• Added test endpoint constant and unit tests

MCP impact

• No tool or API changes
• Tool schema or behavior changed
  • Added new get_check_runs method value to the existing pull_request_read tool's method enum.
• New tool added

Prompts tested (tool changes only)

• "Which CI checks are failing on my PR?"
• "Show me the status of all checks on this pull request"
• "Is my PR ready to merge?"

Security / limits

• No security or limits impact
• Auth / permissions considered
  • Uses existing scopes.Repo scope, same as other PR read methods.
• Data exposure, filtering, or token/size limits considered
  • Returns minimal check run fields only (excludes verbose Output, CheckSuite, App, PullRequests objects) to conserve context tokens.

Tool renaming

• I am renaming tools as part of this PR (e.g. a part of a consolidation effort)
  • I have added the new tool aliases in deprecated_tool_aliases.go
• I am not renaming tools as part of this PR

Lint & tests

• Linted locally with ./script/lint
• Tested locally with ./script/test
  • Ran go test -run Test_GetPullRequestCheckRuns ./pkg/github/... - all tests pass.

Docs

• Updated (README / docs / examples)

[Copilot]

Pull request overview

Adds support for retrieving per-job CI/CD check run status for a pull request by introducing a new get_check_runs method on the existing pull_request_read tool (fixes #1942).

Changes:

• Extended pull_request_read tool schema/enum with get_check_runs and documented it in README/toolsnap.
• Implemented GetPullRequestCheckRuns using the GitHub Checks API and a minimal response shape to reduce payload size.
• Added unit tests and a mock endpoint constant for the check-runs API route.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/github/pullrequests.go	Adds the new get_check_runs method and implements the check-runs retrieval via GitHub Checks API.
pkg/github/minimal_types.go	Introduces minimal types and conversion helper for check run output shaping.
pkg/github/pullrequests_test.go	Adds unit tests covering success and failure paths for get_check_runs.
pkg/github/helper_test.go	Adds mock route constant for GET /repos/{owner}/{repo}/commits/{ref}/check-runs.
pkg/github/toolsnaps/pull_request_read.snap	Updates tool schema snapshot to include the new method enum value and description.
README.md	Updates tool documentation to include the new get_check_runs method.