chore: fix npmrc dev dependency config

[joryirving]

Closes #411

[its-saffron]

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Summary

This PR fixes the .npmrc configuration to ensure that devDependencies are correctly included during npm ci operations. This change directly addresses the recommendation in issue PR 411 to replace the omit= line with include=dev to ensure a reproducible local validation environment where npm run typecheck and npm run test can function correctly from a clean checkout.

Change-by-change findings

• .npmrc: Replaced omit= with include=dev and updated the descriptive comment to reflect the correct configuration syntax.

Linked Issue Fit

• Issue PR 411: The PR implements the exact recommendation provided in the issue: "Replace the .npmrc omit= line with include=dev (or delete the file)".

Standards Compliance

• The change follows the technical debt remediation process as outlined in the linked issue.

Must Checks

• Check for breaking API changes in updated dependencies: N/A. No dependencies were upgraded in this PR; this is a configuration change affecting how dependencies are installed.
• Run full test suite after upgrade: The change affects the installation of devDependencies (required for testing). CI reports that Validate and Docker Build were successful, indicating that the change does not break the build or the test environment.

Unknowns or Needs Verification

• None.