🛡️ Sentinel: [Medium] Fix CLI error handling information disclosure

[google-labs-jules]

This PR improves the security of the CLI by suppressing stack traces in default error output, which could otherwise leak file paths and internal details. It specifically addresses unhandled JSON.parse exceptions when parsing user-provided options. Stack traces are now only shown when DEBUG environment variable is set. Also adds a journal entry for Sentinel.

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PR created automatically by Jules for task 18137053398840985219 started by @srod

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Summary by cubic

Improve CLI security by hiding stack traces by default and safely parsing JSON options. This prevents leaking internal paths and details; stack traces show only when DEBUG is set.

• Bug Fixes

  • Wrap JSON.parse in parseOptions to throw a clean “Invalid JSON options” error.
  • Suppress stack traces in default CLI error output; print full errors only with DEBUG.
  • Style errors with chalk for clearer messages.

• New Features

  • Add Sentinel security journal template (.jules/sentinel.md) to capture critical security learnings.

^{Written for commit 13891b8. Summary will update on new commits.}

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Latest commit: 13891b8

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.36%. Comparing base (309af80) to head (13891b8).

Files with missing lines	Patch %	Lines
packages/cli/src/index.ts	66.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2755      +/-   ##
===========================================
- Coverage    99.54%   99.36%   -0.18%     
===========================================
  Files           58       58              
  Lines         1105     1110       +5     
  Branches       335      336       +1     
===========================================
+ Hits          1100     1103       +3     
- Misses           5        7       +2     

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