Description

On the first run of azd up in a fresh environment (e.g., new devcontainer), the following error occurs:

\
ERROR: loading environment: saving local environment, locking .env: context canceled
\\

The error does not reproduce on subsequent runs — something gets cached that prevents it. Deleting .azure/ does not reproduce the issue.

Screenshots

Context

• Reported by @john0isaac in PR #7776 comment
• Likely pre-existing (env locking code unchanged in exegraph PR)
• Suggests a race condition between environment creation and .env file locking on first run

Repro Steps

1. Install azd in a fresh environment (devcontainer)
2. Run azd up for the first time
3. Observe the context canceled error on .env locking

/cc @john0isaac