Automatically choose the copilot endpoint in the codespace if it's available

[kevinbackhouse]

During codespace initialization, use a curl command to test whether https://api.githubcopilot.com/ is working. If so, default to using that.

[Copilot]

Pull request overview

Updates devcontainer initialization to better bootstrap a Codespaces environment and to prefer the GitHub Copilot API endpoint when it’s reachable/authenticated.

Changes:

• Add a postCreateCommand script that creates a Python venv, installs tooling, builds, and installs the package editable.
• Update post-attach.sh to generate a .env file dynamically and (in Codespaces) probe https://api.githubcopilot.com/models to decide whether to default AI_API_ENDPOINT to https://api.githubcopilot.com.
• Remove the .devcontainer/env-default template file (replaced by inline .env generation).

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

File	Description
.devcontainer/post-create.sh	Adds devcontainer creation-time Python environment setup (venv + deps + build + editable install).
.devcontainer/post-attach.sh	Generates .env and attempts to auto-select Copilot endpoint in Codespaces using a curl probe.
.devcontainer/env-default	Removes the old .env template now that .env is generated by script.

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[Copilot]

The curl probe has no timeout, so a transient DNS/network stall could hang postAttachCommand for a long time. Consider adding --connect-timeout/--max-time (and optionally a small retry) so Codespaces attach remains responsive when the Copilot endpoint is slow/unreachable.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 3 changed files in this pull request and generated 3 comments.

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