Add agentic workflow to file TCGC bump tracking issues for http-client-csharp

[Copilot]

Adds a daily GitHub Agentic Workflow that checks for new stable releases of @azure-tools/typespec-client-generator-core and files a tracking issue assigned to GitHub Copilot to upgrade http-client-csharp when one is found. (GitHub Actions in microsoft repos cannot create PRs, so the workflow files an issue and assigns Copilot to perform the upgrade instead.)

• Trigger: schedule: daily (gh-aw fuzzy daily schedule) with workflow_dispatch for manual runs — checks the npm registry for the latest non-dev TCGC version
• No-op when current: Compares against devDependencies["@azure-tools/typespec-client-generator-core"] in packages/http-client-csharp/package.json; exits without creating an issue if already up to date
• Duplicate issue detection: Searches existing issues in any state (open or closed) that carry the emitter:client:csharp label and reference upgrading TCGC to the same version (Bump TCGC to <LATEST_STABLE>); exits without creating a new issue if a match is found
• Issue creation: Files a new issue using the Bump TCGC to <LATEST_STABLE> title format and the body structure of #10367 (links to the TCGC CHANGELOG anchor and asks for Generate.ps1 to be rerun)
• Issue labeling: safe-outputs.create-issue.labels: [emitter:client:csharp] applies the label automatically at issue-creation time
• Copilot assignment: Uses safe-outputs.create-issue with assignees: [copilot] to assign the Copilot coding agent at issue creation time, per the assign-to-copilot docs. The Copilot coding agent then follows the existing migration steps in .github/prompts/upgrade-tcgc.instructions.md to perform the actual version bump.
• Default model: safe-outputs.assign-to-agent is configured with name: copilot and model: "claude-opus-4.6" to set the default model for the assigned agent (model: is not a valid field on create-issue itself in the gh-aw schema)
• Frontmatter format: Aligned with the repo standard established by PR Add issue triage agentic workflow #10001 (issue-triage.md) — uses description: only (no name:), simple network: defaults, engine: copilot, permissions: read-all, and canonical tools: web-fetch: / github: toolsets: [issues, repos], lockdown: false
• Lock file: Includes the compiled bump-tcgc-csharp.lock.yml generated by gh aw compile

This replaces the manual process of filing an issue + assigning Copilot for each TCGC patch/minor bump (e.g. commits 458f881, f3bdd60).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create an Agentic Workflow to Automatically Upgrade TCGC Dependency for the http-client-csharp package</issue_title>
<issue_description>We should look into creating a new agentic workflow that automates the version bump process for tcgc. The workflow should run once a day and check if a new non-dev tcgc version is available at https://www.npmjs.com/package/@azure-tools/typespec-client-generator-core and if that version is newer than the one used in http-client-csharp. If there is no new version, no PR should be opened. If there is a new version, then a PR should be opened with the code updates. Some examples of this being done previously:

• 458f881
• f3bdd60</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create an Agentic Workflow to Automatically Upgrade TCGC Dependency for the http-client-csharp package #10013

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/github/gh-aw/git/ref/tags/v0.50.1
  • Triggering command: /usr/bin/gh gh api /repos/github/gh-aw/git/ref/tags/v0.50.1 --jq .object.sha (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/github/gh-aw/git/ref/tags/v0.50.1
  • Triggering command: /usr/bin/gh gh api /repos/github/gh-aw/git/ref/tags/v0.50.1 --jq .object.sha (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[github-actions]

No changes needing a change description found.

[azure-sdk]

You can try these changes here

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