Clean up AmbientAgentsImageUpload feature flag

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Automated cleanup of the AmbientAgentsImageUpload feature flag.

This PR was generated by the feature flag cleanup workflow.

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Overview

This PR cleans up the AmbientAgentsImageUpload rollout flag by removing the Cargo feature, runtime feature-flag entry, and conditional gates around ambient-agent attachment upload/download paths.

Concerns

No blocking correctness, security, or spec-alignment concerns found in the changed lines. No approved or repository spec context was available for this PR.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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