🛡️ Sentinel: [CRITICAL] Fix LaTeX injection in Cover Letter Generator

[anchapin]

This PR fixes a critical LaTeX injection vulnerability in the Cover Letter Generator. Previously, user input (e.g., company name) was rendered into LaTeX templates using a standard Jinja2 environment, allowing malicious LaTeX commands (like \input{...}) to be executed during PDF compilation.

Changes:

• Modified cli/generators/cover_letter_generator.py to use get_jinja_tex_env, which includes a finalize hook that automatically escapes all variable output using latex_escape.
• Updated cli/utils/template_utils.py to add datetime.now (aliased as now) to the tex_env globals, as it was missing and caused a regression in templates that use {{ now() }}.
• Added tests/test_cover_letter_security.py to verify the fix and prevent regression.
• Documented the vulnerability and fix in .jules/sentinel.md.

Verification:

• Ran reproduce_issue.py (created during investigation) which confirmed the fix.
• Ran existing tests (pytest) to ensure no regressions.

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PR created automatically by Jules for task 5353573970625624386 started by @anchapin

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