v1.3.1 — Reliable release checks
This patch makes the test and release checks more reliable without changing the document schema, operation API or editor features.
- MCP integration tests build the executable they exercise and use Cargo's reported artifact path.
- HTTP test clients stop at a complete response instead of waiting for the socket to close.
- Browser test startup, commands and cleanup have bounded waits; CI and release jobs have time limits.
- Cross-transport smoke tests run on all six targets before release and against checksum-verified downloaded archives after publication.
schemaVersion remains 1. Existing documents retain the same rendering pixels; exported metadata records renderer version 1.3.1.