Bring builtin_tools/security._redact_secrets from 58% to 100% coverage.
Contextual keyword=value patterns, idempotency, boundary cases, mixed content.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Port HTTP/SSE transport (from workspace-runtime PR #16) to the canonical
monorepo source. Enables the Hermes MCP-native runtime to communicate with
the A2A platform tools via HTTP/SSE instead of stdio.
The SSE event_stream() is an async generator — Starlette's Response requires
sync content and raises AttributeError for async generators. Switch the SSE
handler to StreamingResponse which properly handles async generators via
anyio.create_task_group (Starlette 1.0.0).
Adds test_a2a_mcp_server_http.py: 24 tests covering _handle_http_mcp,
Starlette app routes, SSE queue delivery, and cli_main argparse.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>