Land PR #1216: fix(security): sandbox local media paths

[groupthinking]

#1216

Needs a rebase onto main to resolve merge conflicts before anything else.

[linear-code]

GRV-296

[github-actions]

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[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• GRV-233
• security: restrict local image_url paths in AWSRekognitionProvider._prepare_image_input #1209

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