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/healthy-project/.claude/rules/typescript.md

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+---
+paths: src/**/*.ts
+---
+
+# TypeScript Rules
+Use strict TypeScript. No `any` types.

tests/fixtures/healthy-project/.claude/settings.json

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+{
+  "$schema": "https://json.schemastore.org/claude-code-settings.json",
+  "permissions": {
+    "allow": ["Bash(npm run *)"],
+    "deny": ["Read(./.env)"]
+  }
+}

tests/fixtures/healthy-project/.claude/shared.md

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+# Shared Configuration
+
+Common patterns and conventions shared across the project.
+
+## Naming Conventions
+- Use camelCase for variables and functions
+- Use PascalCase for classes and types