feat(14-02): add research-subagent-prompt.md template

- Context-only template (92 lines)
- Matches debug-subagent-prompt.md pattern
- Research expertise lives in agent, not template

get-shit-done/templates/research-subagent-prompt.md

@@ -0,0 +1,92 @@
+# Research Subagent Prompt Template
+
+Template for spawning gsd-researcher agent. The agent contains all research expertise - this template provides research context only.
+
+---
+
+## Template
+
+```markdown
+<objective>
+Research: {research_question}
+
+Mode: {research_mode}
+</objective>
+
+<context>
+**Phase:** {phase_number} - {phase_name}
+**Description:** {phase_description}
+
+**Requirements:**
+{phase_requirements}
+
+**Constraints:**
+{constraints_from_state}
+
+**Phase context (if available):**
+{context_md_content}
+</context>
+
+<output>
+Write research findings to: {output_path}
+Use RESEARCH.md template structure for phase research.
+</output>
+```
+
+---
+
+## Placeholders
+
+| Placeholder | Source | Example |
+|-------------|--------|---------|
+| `{research_question}` | Phase description | `How to implement 3D visualization` |
+| `{research_mode}` | Orchestrator sets | `ecosystem` |
+| `{phase_number}` | From roadmap | `5` |
+| `{phase_name}` | From roadmap | `3d-visualization` |
+| `{phase_description}` | From roadmap | `Add interactive 3D model viewer` |
+| `{phase_requirements}` | From REQUIREMENTS.md | `VIZ-01: Support GLB format` |
+| `{constraints_from_state}` | From STATE.md decisions | `Using React, not Vue` |
+| `{context_md_content}` | From CONTEXT.md | User's vision notes |
+| `{output_path}` | Generated | `.planning/phases/5-viz/5-RESEARCH.md` |
+
+---
+
+## Usage
+
+**From /gsd:research-phase:**
+```python
+Task(
+  prompt=filled_template,
+  subagent_type="gsd-researcher",
+  description="Research Phase {phase}"
+)
+```
+
+---
+
+## Continuation
+
+For checkpoints, spawn fresh agent with:
+
+```markdown
+<objective>
+Continue research for Phase {phase_number}: {phase_name}
+</objective>
+
+<prior_state>
+Research file: @{output_path}
+</prior_state>
+
+<checkpoint_response>
+**Type:** {checkpoint_type}
+**Response:** {user_response}
+</checkpoint_response>
+
+<mode>
+Continue: {research_mode}
+</mode>
+```
+
+---
+
+**Note:** Research methodology, tool strategy (Context7 > Official > WebSearch), and verification protocols are baked into the gsd-researcher agent. This template only passes context.