feat(ultraplan-local): v1.6.0 — /ultraresearch-local deep research command

Add /ultraresearch-local for structured research combining local codebase
analysis with external knowledge via parallel agent swarms. Produces research
briefs with triangulation, confidence ratings, and source quality assessment.

New command: /ultraresearch-local with modes --quick, --local, --external, --fg.
New agents: research-orchestrator (opus), docs-researcher, community-researcher,
security-researcher, contrarian-researcher, gemini-bridge (all sonnet).
New template: research-brief-template.md.

Integration: --research flag in /ultraplan-local accepts pre-built research
briefs (up to 3), enriches the interview and exploration phases. Planning
orchestrator cross-references brief findings during synthesis.

Design principle: Context Engineering — right information to right agent at
right time. Research briefs are structured artifacts in the pipeline:
ultraresearch → brief → ultraplan --research → plan → ultraexecute.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/fixtures/broken-project/.mcp.json

@@ -0,0 +1,24 @@
+{
+  "mcpServers": {
+    "sse-server": {
+      "type": "sse",
+      "url": "https://api.example.com/mcp"
+    },
+    "unknown-type-server": {
+      "type": "grpc",
+      "command": "grpc-server"
+    },
+    "no-trust-server": {
+      "type": "stdio",
+      "command": "npx",
+      "args": ["-y", "@modelcontextprotocol/server-filesystem"]
+    },
+    "missing-env-server": {
+      "type": "stdio",
+      "command": "npx",
+      "args": ["-y", "server", "${MISSING_API_KEY}", "--token", "${SECRET_TOKEN}"],
+      "extraField": true,
+      "anotherUnknown": "value"
+    }
+  }
+}