🛡️ Sentinel: [HIGH] Fix predictable temporary file path in wiki-daily-digest

[callmeradical]

🚨 Severity: HIGH
💡 Vulnerability: The wiki-daily-digest script generated temporary files using predictable names (wiki_claude_{session_id}.txt), which allowed local attackers to potentially execute symlink attacks to overwrite arbitrary files, or to view sensitive session contents (CWE-377: Insecure Temporary File).
🎯 Impact: Local arbitrary file overwrite or sensitive data disclosure in multi-tenant environments.
🔧 Fix: Refactored the inline Python script to use tempfile.NamedTemporaryFile, which safely and randomly generates unique temporary files. Passed the dynamically generated file path back to the Bash script via standard output, removing the need to predict the file name entirely.
✅ Verification: bin/wiki-daily-digest tested, Go core tests passed. Validated patch safely replaces the static string concatenation.

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PR created automatically by Jules for task 5958870366501161639 started by @callmeradical

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