feat(cli): warn when --env values look like credentials

[letv1nnn]

Summary

openshell sandbox create now emits a non-blocking warning when an --env key looks like a credential, steering users toward providers so secrets aren't exposed to the sandboxed agent. The warning suggests a specific provider create command when the key matches a built-in provider profile, and otherwise links to the providers docs.

Related Issue

NVIDIA#2548

Changes

• Add credential_env_matches in crates/openshell-cli/src/commands/common.rs: flags --env keys by name only — known provider env vars from builtin_profiles(), plus *_TOKEN, *_SECRET, *_PASSWORD, *_CREDENTIAL, *_ACCESS_KEY, *_SECRET_KEY, *_API_KEY suffixes (case-insensitive). Never inspects or prints values.
• Add warn_credential_env_vars: prints a non-blocking stderr warning per flagged key. When built-in profiles claim the
  key it lists a specific openshell provider create command per match (a key can map to several, e.g. GITHUB_TOKEN →
  copilot and github); otherwise it links to the providers docs.
• Add the --no-credential-warnings flag to sandbox create and wire the warning in before the CreateSandbox RPC
  (create only, not exec).
• Re-export warn_credential_env_vars through run to match the existing parse_env_pairs call pattern.
• Unit tests in common.rs covering profile match, suffix-only match, case-insensitivity, non-credential skip,
  no-value-leak, and deterministic ordering.
• Document the warning and flag in docs/sandboxes/manage-sandboxes.mdx.

Testing

• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Publisher/user docs updated (if applicable)
• Architecture docs updated (if applicable)

Summary by CodeRabbit

• New Features

  • Added non-blocking warnings when sandbox environment variable names appear to contain provider credentials.
  • Added suggestions for creating configured providers when matching credentials are detected.
  • Added --no-credential-warnings to suppress these notifications.

• Documentation

  • Documented credential warnings, suppression, and provider recommendations.
  • Clarified that credential values are identified by variable names only and are never inspected or displayed.

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📝 Walkthrough

Walkthrough

The CLI detects credential-like --env keys during sandbox create, displays provider guidance without exposing values, and supports warning suppression with --no-credential-warnings. Documentation describes the detection and provider workflow.

Changes

Credential environment warnings

Layer / File(s)	Summary
Credential detection and warning output crates/openshell-cli/src/commands/common.rs	Credential suffixes and built-in provider mappings identify environment keys. Warnings are sorted and exclude credential values. Tests cover matching, filtering, case-insensitivity, ordering, and value non-disclosure.
Sandbox create integration and documentation crates/openshell-cli/src/main.rs, crates/openshell-cli/src/run.rs, docs/sandboxes/manage-sandboxes.mdx	sandbox create accepts --no-credential-warnings, passes the option to validation, re-exports the warning function, and documents the behavior.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant SandboxCreate
  participant warn_credential_env_vars
  participant ProviderProfiles
  SandboxCreate->>warn_credential_env_vars: parsed --env pairs
  warn_credential_env_vars->>ProviderProfiles: match credential-like keys
  ProviderProfiles-->>warn_credential_env_vars: provider suggestions
  warn_credential_env_vars-->>SandboxCreate: warnings or suppressed output

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Suggested reviewers: varshaprasad96, drew

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main CLI change: warning when --env entries appear to contain credentials.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch warn-credential-env-vars

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[letv1nnn]

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