🛡️ Sentinel: [CRITICAL/HIGH] Fix Option Injection

[dttdrv]

🚨 Severity: HIGH
💡 Vulnerability: Option Injection (Command Injection) via array-based arguments. The mainFile parameter was passed directly to the latexmk binary via array-based argument passing (Command::new("latexmk").arg(&req.main_file)) without validating if the filename started with a hyphen (-). This allowed attackers to provide filenames like -shell-escape or -interaction=..., which latexmk would interpret as command-line flags.
🎯 Impact: Attackers could inject arbitrary options into the latexmk command execution, potentially escaping the intended execution context or gaining unintended execution capabilities on the compile worker.
🔧 Fix: Modified the parsing of mainFile in CompileQueueService.enqueue to strictly validate and reject any filename starting with a - by throwing a 400 Bad Request error. Added a critical learning entry to .jules/sentinel.md.
✅ Verification: Ran the full project test suite using Vitest to confirm no regressions and manually verified the mainFile logic via code inspection.

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PR created automatically by Jules for task 16557289786198474322 started by @dttdrv

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