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/test-plugin/.claude-plugin/plugin.json

@@ -0,0 +1,5 @@
+{
+  "name": "test-plugin",
+  "description": "A test plugin for config-audit plugin-health scanner",
+  "version": "1.0.0"
+}

tests/fixtures/test-plugin/CLAUDE.md

@@ -0,0 +1,21 @@
+# Test Plugin
+
+A test plugin for validating plugin-health scanner.
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `/test-plugin:test-cmd` | A test command |
+
+## Agents
+
+| Agent | Role | Model |
+|-------|------|-------|
+| test-agent | Test agent | sonnet |
+
+## Hooks
+
+| Event | Script | Purpose |
+|-------|--------|---------|
+| PreToolUse | test-hook.mjs | Test hook |

tests/fixtures/test-plugin/agents/test-agent.md

@@ -0,0 +1,10 @@
+---
+name: test-agent
+description: A test agent for validation
+model: sonnet
+tools: ["Read", "Glob"]
+---
+
+# Test Agent
+
+A test agent.

tests/fixtures/test-plugin/commands/test-cmd.md

@@ -0,0 +1,10 @@
+---
+name: test-plugin:test-cmd
+description: A test command
+allowed-tools: Read, Bash
+model: sonnet
+---
+
+# Test Command
+
+This is a test command.

tests/fixtures/test-plugin/hooks/hooks.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "PreToolUse": [
+      {
+        "matcher": "Bash",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "echo test"
+          }
+        ]
+      }
+    ]
+  }
+}