[angelannaji92-cyber]

Summary

Normalize Node.js and npm diagnostic remediation guidance to follow the shared classification contract. Ensure missing or incompatible toolchain versions produce concise, actionable messages while preserving existing diagnostic results and exit behavior.

Related Issue

Closes #127

Scope

• Align Node.js and npm remediation messages with the shared diagnostic classification contract.
• Provide clear, actionable guidance for missing or incompatible Node.js and npm installations.
• Ensure diagnostic messages do not expose environment variables, secrets, or sensitive environment details.
• Preserve existing result structures, classification behavior, and exit-code contracts.
• Add or update focused tests for missing tools, incompatible versions, and remediation output.
• Keep changes limited to diagnostics and related tests, leaving unrelated behavior unchanged.

Testing

• Tests added/updated where applicable
• Existing relevant tests pass
• Lint/type/build checks pass where available

Planned verification:

• Test missing Node.js and npm scenarios.
• Test incompatible Node.js and npm versions and verify remediation guidance.
• Verify diagnostic result structures and exit codes remain unchanged.
• Confirm output does not expose environment details or secrets.
• Run relevant diagnostics tests and repository checks.

Security Impact

• No security-sensitive behavior is changed
• Security-sensitive behavior is changed and explained below

Security notes:

This change is limited to diagnostic classification and remediation guidance. It will ensure messages provide actionable instructions without reflecting environment variables, secrets, or other sensitive configuration details.

Release Impact

• No published/user-visible behavior change

• Patch

• Minor

• Breaking/pre-1.0 contract change

• Changeset included where required

• Changeset not required; reason explained below

Release notes:

No changes to public APIs, diagnostic result contracts, or exit codes are intended. The change standardizes diagnostic messaging and remediation guidance without altering established behavior.

Documentation

• Documentation updated where applicable
• No documentation change required

Update relevant diagnostic guidance or inline documentation if needed to keep remediation messages consistent with the shared classification contract.

Checklist

• I read docs/contributing/wave-architecture.md for Stellar Wave work
• I stayed within the agreed issue scope
• I checked for overlapping open contributor PRs
• I did not include secrets or sensitive data
• I reviewed new/updated dependencies if any
• I considered failure/error paths, not only the happy path
• I am not disclosing an unresolved vulnerability publicly

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