v0.1.2 — MCP compatibility fixes

Fixes two adapter bugs found scanning real MCP servers:

• Error payloads returned inside successful responses (FastMCP-style servers) are now counted as failures. Previously a scan where every call was rejected reported a 0% error rate.
• The initialize handshake is now best-effort, so servers on MCP's stateless core (spec 2026-07-28) can be scanned.