spec-sync(v1): add 415 response for non-multipart request bodies

[yzld2002]

Automated spec-sync PR.

• Commit 1 (mechanical): normalized spec snapshot + regenerated reference models.
• Commit 2 (AI): resources/methods/tests/docs wired from the spec diff (added after this PR opened).

Gates (surface-lock, contract tests, lint/test/typecheck) must pass. Human review required before merge.

What changed

AI-generated from the PR diff — verify against the actual changes.

This PR documents a new 415 error response for endpoints requiring multipart/form-data request bodies.

Changes:

• Added a documented 415 response ("The request body was not form-encoded. Send multipart/form-data.") to the synchronous extraction endpoint.
• Added the same documented 415 response to the async job submission endpoint.

[Copilot]

🔵 Needs a closer look

The PR explicitly requires final human review before merge.

Pull request overview

Synchronizes the V1 OpenAPI snapshot with upstream spec drift.

Changes:

• Records HTTP 415 responses for non-form-encoded requests.
• Contains only the expected mechanical spec snapshot update.

File summaries

File	Description
specs/v1-ade.json	Mirrors updated upstream V1 response definitions.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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