docs: sharpen workflow-authoring guidance for PR scoping, backend compatibility checks, and coverage fallback networking

[Copilot]

Persona exploration found the routing guidance was strong overall, with targeted gaps in PR path-scoping examples, backend schema/API review instructions, and fallback coverage network policy. This PR tightens those guidance points in the authoring docs used to generate workflows.

• Create workflow guidance (.github/aw/create-agentic-workflow.md)

  • Expanded the PR scenario from schema-only to schema/API contract review.
  • Added explicit pull_request.paths scoping examples for backend contract surfaces (db/migrate/**, migrations/**, schema/**, openapi/**, api/**).
  • Added compact backend-review guidance: classify changes as additive / backward-compatible / breaking, and emit actionable risks only.
  • Strengthened the scoping checklist to explicitly require backend contract globs for backend-review automations.

• Coverage workflow guidance (.github/aw/test-coverage.md)

  • Clarified fallback behavior when artifacts are missing: infer ecosystem from repo files and require network.allowed = [defaults + ecosystem].
  • Explicitly disallowed fallback coverage runs with network: defaults alone.
  • Added a compact YAML example for fallback network config.

network:
  allowed:
    - defaults
    - node

[Copilot]

Pull request overview

This PR updates internal workflow-authoring guidance used by gh-aw to generate/shape agentic workflows, focusing on (1) tighter PR trigger scoping for backend contract reviews and (2) safer network policy expectations for fallback coverage runs.

Changes:

• Expanded the “schema review” scenario into a schema/API contract review pattern, with concrete pull_request.paths scoping examples for backend contract surfaces.
• Added compact backend-review guidance to classify contract changes (additive / backward-compatible / breaking) and report only actionable risks.
• Clarified fallback coverage guidance to require inferring repo ecosystem and expanding network.allowed beyond defaults.

Show a summary per file

File	Description
.github/aw/test-coverage.md	Adds fallback coverage guidance and an example network.allowed configuration.
.github/aw/create-agentic-workflow.md	Strengthens PR scoping guidance for backend contract reviews and adds a compact backend-review checklist.

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• Files reviewed: 2/2 changed files
• Comments generated: 1