release: 0.1.5 — SSE-stream tools/call to dodge ingress timeout

agent-builder.build (and any long-running skill) takes minutes — LLM
loop + sandbox tests + deploy + wait-for-live-card. A plain JSON POST
to /mcp gets killed by ingress idle timeouts (~60s on traefik) and the
gateway sees "fetch failed" while the upstream is still running.

UpstreamAgent.callTool now negotiates ``Accept: text/event-stream`` on
tools/call. We drain SSE frames, return the final tools/call result,
and fall back to plain JSON if the upstream doesn't speak SSE (older
a2a-pack). Elicit relaying isn't wired yet; for now any
elicitation/create frame is ignored.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "a2amcp",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "description": "MCP gateway for a2acloud agents. Run as a local MCP server; expose any number of deployed A2A agents to Claude Code, Cursor, and other MCP clients.",
   "type": "module",
   "bin": {