Add specialty clinic evidence demo

[aniketh-maddipati]

Summary

This PR moves the local specialty-clinic evidence work onto its own branch and packages the demo for review. It adds a Blue Magma-style continuous compliance collector demo that wraps agent tool calls with AgentMint receipts, exports an auditor-verifiable evidence bundle, and includes tamper and scale demos for showing how signatures and hash-chain verification behave.

Issue

The specialty-clinic example already demonstrated a small offline receipt flow, but the local working tree also contained broader demo material that was still sitting directly on main. That made the work hard to review, easy to accidentally mix with unrelated changes, and not yet shareable as a focused PR.

Cause And Effect

The new demo code shows the buyer-facing value more directly: an agent can collect SOC 2-style evidence, hit a checkpoint for a privileged IAM change, retry with a narrow pre-approved action, and produce signed receipts that an auditor can verify without a vendor dashboard. The included generated evidence bundle lets reviewers inspect the exported artifact immediately, while the tamper scripts demonstrate the failure mode if a receipt is edited after signing.

Fix

The branch adds the collector wrapper, registered demo tools, Anthropic-driven live demo entrypoint, payment/scale/tamper demo scripts, and specialty-clinic helper scripts. It also adjusts the existing specialty-clinic demo output pacing and suppresses noisy OpenSSL stderr in the verification script so the demo reads cleaner in terminal recordings.

Validation

• python3 -m pytest passed: 324 tests, 5 dependency deprecation warnings.
• bash verify.sh passed in examples/specialty_clinic_evidence_artifact.
• bash VERIFY.sh passed in output/evidence, verifying 5/5 signatures, 5/5 chain links, and the plan cross-reference.