[schema-coverage] feat: Add schema coverage demo for metadata field

[github-actions]

Schema Coverage Demo

This PR adds a minimal demo workflow that demonstrates usage of the metadata field in the gh-aw frontmatter schema.

Why: The schema feature coverage checker found that metadata was not used in any existing workflow.

What: Adds schema-demos/schema-demo-metadata.md with a valid, minimal demonstration of this field.

Field Description

Optional metadata field for storing custom key-value pairs compatible with the custom agent spec. Key names are limited to 64 characters, and values are limited to 1024 characters.

Validation

Attempted make agent-finish, but it was blocked before tests by the Go toolchain download: proxy.golang.org returned Forbidden for golang.org/toolchain@v0.0.1-go1.25.8.linux-amd64.zip. No local ./gh-aw binary was present for compile-only validation.

Warning

Firewall blocked 3 domains

The following domains were blocked by the firewall during workflow execution:

• ab.chatgpt.com
• chatgpt.com
• proxy.golang.org

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "ab.chatgpt.com"
    - "chatgpt.com"
    - "proxy.golang.org"

See Network Configuration for more information.

Generated by Schema Feature Coverage Checker · ◷

• expires on May 11, 2026, 7:37 AM UTC

[Copilot]

Pull request overview

Adds a minimal schema demo workflow to ensure the metadata frontmatter field is represented in the repo for schema feature coverage tracking.

Changes:

• Added schema-demos/schema-demo-metadata.md demonstrating a valid metadata: object with string values.
• Included a minimal “coverage-only” task that instructs the agent to emit a noop safe-output.

Show a summary per file

File	Description
schema-demos/schema-demo-metadata.md	Adds a minimal demo workflow using the metadata frontmatter field to satisfy schema coverage.

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• Files reviewed: 1/1 changed files
• Comments generated: 0