fix(cli): prevent debug log persistence in production deployments

[murdore]

• Fixed CLI middleware logical gap where NEUROLINK_DEBUG wasn't explicitly set to 'false' when no debug flag provided
• Prevents inherited environment variables from causing unwanted debug logs in production
• Ensures deterministic logging behavior controlled by CLI flags, not external environment
• Maintains backward compatibility - debug mode still works perfectly with --debug flag

Fixes: Debug logs appearing in deployed CLI without --debug flag
Impact: Clean production output, environment-independent logging behavior
Version: 1.5.3

[Copilot]

Pull Request Overview

This PR addresses a CLI middleware bug by ensuring that the environment variable controlling debug logging (NEUROLINK_DEBUG) is explicitly set to 'false' when debug mode is not enabled, preventing unwanted debug logs from persisting in production. The key changes include:

• Simplifying the debug flag handling in the CLI to always set NEUROLINK_DEBUG to 'false' when not in debug mode.
• Updating the package version to 1.5.3.
• Adding a detailed changelog entry documenting the fix.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/cli/index.ts	Updated CLI debug flag logic to ensure NEUROLINK_DEBUG is set to 'false'.
package.json	Bumped version from 1.5.2 to 1.5.3.
CHANGELOG.md	Documented the debug log persistence fix and version update.

Comments suppressed due to low confidence (1)

src/cli/index.ts:183

• The updated condition simplifies the handling of the debug flag by setting NEUROLINK_DEBUG to 'false' whenever debug mode is not active. Confirm that this behavior is intended, particularly for cases where the debug flag might be explicitly set to a falsy value.

} else {