Add corrupt success case study

[marsloting]

This adds a case study for a failure mode that is easy to miss in agent workflows: corrupt success.

The agent reports done and the producer-side check passes, but the downstream consumer never receives the work because proof was collected upstream of the point where the failure surfaces.

Why this fits this list:

• It is a concrete verification and termination failure, not just a hallucination.
• It connects a production workflow failure pattern to the 2026 "corrupt success" research thread.
• It adds a practical mitigation: evidence for done/written/shipped claims must come from the consumer endpoint, not from an upstream proxy.

Changes:

• Added a new case study: docs/case-studies/agent-corrupt-success-consumer-verification.md
• Added a README entry under Autonomous Agent Failures
• Added the example to docs/failure-modes/verification-termination.md

Validation:

• git diff HEAD~1..HEAD --check
• Scanned changed files for accidental private identity/internal-context terms before publishing

[Copilot]

Pull request overview

Adds a new case study documenting the “corrupt success” verification/termination failure mode, where an agent’s producer-side “done” evidence passes checks but the downstream consumer never receives the work. This expands the repository’s catalog of concrete agent workflow failure patterns and mitigation guidance.

Changes:

• Added a new case study on consumer-end verification for “done/written/shipped” claims.
• Linked the new case study from the main README under “Autonomous Agent Failures”.
• Added the case study as a real-world example under Verification & Termination Failures.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
README.md	Adds a new “Autonomous Agent Failures” entry pointing to the corrupt success case study.
docs/failure-modes/verification-termination.md	Adds a new real-world example describing the corrupt success verification failure pattern.
docs/case-studies/agent-corrupt-success-consumer-verification.md	Introduces a new case study write-up with scenario, impact, and mitigation guidance focused on consumer-end proof.

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