[simsinght]

Review: https://app.aviator.co/r/1837

For sessions where the customer runs the change themselves and Aviator only judges (mergeit: external evidence sessions).

• aviator verify --evidence-source aviator|external at submission and aviator edit --evidence-source on an existing session; the value is echoed in the output and --json.
• aviator evidence submit r/N <manifest>: reads a YAML or JSON manifest of the scenarios that were run (summary, ordered steps, evidence files per step with a type and a label, optional pinned criteria), resolves each file's size and content type from its extension, posts the manifest, PUTs every file to the signed URL the server returns with the declared content type and no bearer token, then confirms the uploads. The commit is required: the full 40-character SHA from --commit or the manifest's commit, taken as given (the CLI never runs git). Exits non-zero and names the files when an upload fails or the server reports one missing.
• aviator scenarios shows "submitted by for " instead of a tool call count for a submitted scenario run; --json carries source, submitted_by and commit_sha.

Manifest validation (missing file, unsupported extension, missing label, malformed criterion handle, empty manifest) happens before any API call.

[aviator-app]

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[aviator-app]

Connected this PR to r/1837.