fix(sandbox): pass --auto-providers to sandbox create in dev script

[maxamillion]

Summary

mise run sandbox fails with missing required provider 'claude' when ANTHROPIC_API_KEY is not set in the environment.

Related Issue

None (discovered via direct reproduction).

Root Cause

The sandbox.sh script runs non-interactively from mise, so stdin is not a terminal. When the trailing command (claude) infers a provider type, the CLI's auto_create_provider function checks whether it can prompt the user. Since auto_providers_override is None (no --auto-providers flag passed) and stdin is not a terminal, it hard-errors:

Missing provider: claude
Error: × missing required provider 'claude'. Create it first with `openshell
  │ provider create --type claude --name claude --from-existing`, pass --auto-
  │ providers to auto-create, or set it up manually from inside the sandbox

Changes

Add --auto-providers to the openshell sandbox create call in tasks/scripts/sandbox.sh.

With --auto-providers:

• If ANTHROPIC_API_KEY is set, the Claude provider plugin discovers it and auto-creates the provider → sandbox starts with the provider configured
• If ANTHROPIC_API_KEY is not set, discover_existing returns None, the CLI prints a warning and continues → sandbox starts without the provider (user can configure it later from inside the sandbox)

Testing

Verified mise run sandbox succeeds both with and without ANTHROPIC_API_KEY set:

Without ANTHROPIC_API_KEY:

Creating sandbox 'dev'...
Missing provider: claude
! No existing local credentials/config found for 'claude'. You can configure it from inside the sandbox.
Created sandbox: dev

Checklist

• Code follows existing conventions
• Change is minimal and focused
• Tested locally with mise run sandbox

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