Implement label state and issue-label routes in the GitHub simulator

[Copilot]

The GitHub simulator was still returning random responses for repository and issue label endpoints, leaving the Issues surface incomplete for tooling that depends on label lifecycle behavior. This change adds stateful label support in the repo domain and wires the affected routes to that state.

• Repo label state

  • adds per-repository label storage in routes/repos/_.context.ts
  • introduces label CRUD helpers plus issue-label operations (add, remove, replace, list)
  • resolves issue labels to canonical repo label objects so issue state stays aligned with repo state

• Route implementation

  • implements stateful handlers for:
    • GET/POST /repos/{owner}/{repo}/labels
    • GET/PATCH/DELETE /repos/{owner}/{repo}/labels/{name}
    • GET/POST/PUT/DELETE /repos/{owner}/{repo}/issues/{issue_number}/labels
    • DELETE /repos/{owner}/{repo}/issues/{issue_number}/labels/{name}
  • returns 404s for missing repos/issues instead of random payloads
  • keeps label route calls compatible via root-context forwarding methods

• Seed data

  • seeds standard labels (bug, enhancement, documentation, question) for counterfact/platform-api
  • attaches enhancement to the existing open issue so seeded issue data exercises the new paths

• Coverage

  • adds repo-context tests for label creation, rename, deletion, and issue-label mutation
  • adds route-level tests covering repo label CRUD, issue label add/replace/remove flows, and missing-resource behavior
  • removes the completed todo entry for this task

$.context.saveLabel("counterfact", "platform-api", {
  name: "enhancement",
  color: "84b6eb",
  description: "New feature or request",
});

$.context.addLabelToIssue("counterfact", "platform-api", 1, [
  "enhancement",
  "bug",
]);

[Copilot]

Pull request overview

This PR implements stateful repository and issue label behavior in the GitHub API simulator, replacing random label route responses with context-backed state and seeded data.

Changes:

• Adds repository label storage and issue-label helpers in the repos context, with root-context forwarding.
• Implements label CRUD and issue-label route handlers with missing-resource handling.
• Seeds default labels and adds context, route, and scenario coverage for label behavior.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
github/routes/repos/_.context.ts	Adds label state, CRUD helpers, issue-label mutation, and label resolution.
github/routes/_.context.ts	Forwards label methods from root context to repos context.
github/routes/repos/{owner}/{repo}/labels.ts	Implements list/create repository label routes.
github/routes/repos/{owner}/{repo}/labels/{name}.ts	Implements get/update/delete repository label routes.
github/routes/repos/{owner}/{repo}/issues/{issue_number}/labels.ts	Implements list/add/replace/remove-all issue label routes.
github/routes/repos/{owner}/{repo}/issues/{issue_number}/labels/{name}.ts	Implements remove-one-label-from-issue route.
github/scenarios/index.ts	Seeds default labels before issues.
github/test/repos.context.test.ts	Adds repos-context label behavior tests.
github/test/routes.test.ts	Adds route-level label lifecycle and 404 tests.
github/test/scenarios.test.ts	Verifies seeded labels in scenario tests.
.github/todo/labels-v2.md	Removes completed labels task description.

[pmcelhaney]

@copilot address the comments

[Copilot]

@copilot address the comments

Addressed in fa09416. Partial label updates now preserve the existing color when a rename omits it, and the repo-context test covers that regression.