feat(skills): add deep-research skill

Copy deep-research skill from local Qoder installation to config repo for version control

skills/deep-research/templates/literature_matrix_template.md

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+# Literature Matrix Template
+
+## Purpose
+Source x Theme cross-tabulation for systematic evidence mapping. Used by the synthesis_agent to organize evidence before writing the synthesis narrative.
+
+## Matrix Structure
+
+### Basic Matrix
+
+```markdown
+## Literature Matrix: [Research Topic]
+
+**Date compiled**: [YYYY-MM-DD]
+**Total sources**: [N]
+**Themes identified**: [N]
+
+| Source | Year | Level | Theme A | Theme B | Theme C | Theme D | Theme E |
+|--------|------|-------|---------|---------|---------|---------|---------|
+| Author1 | 2024 | II | ✓ Supports | — | ✓ Supports | ✗ Contradicts | — |
+| Author2 | 2023 | III | ✓ Supports | ✓ Supports | — | — | ✓ Supports |
+| Author3 | 2022 | VI | — | ✓ Supports | ✓ Supports | ✓ Supports | — |
+| Author4 | 2024 | I | ✓ Supports | ✓ Supports | ✗ Contradicts | — | ✓ Supports |
+| Author5 | 2023 | IV | ✗ Contradicts | — | ✓ Supports | ✓ Supports | — |
+| **Totals** | | | **4✓ 1✗** | **3✓ 0✗** | **3✓ 1✗** | **2✓ 1✗** | **2✓ 0✗** |
+
+### Legend
+- ✓ Supports: Source provides evidence supporting this theme
+- ✗ Contradicts: Source provides evidence contradicting this theme
+- — : Source does not address this theme
+- Level: Evidence hierarchy level (I = highest, VII = lowest)
+```
+
+### Extended Matrix (with detail)
+
+```markdown
+## Extended Literature Matrix
+
+| Source | Method | Sample | Theme A: [name] | Theme B: [name] | Quality |
+|--------|--------|--------|-----------------|-----------------|---------|
+| Author1 (2024) | RCT, N=500 | University students, US | "Finding X was significant (p<.001)" — Supports | Not addressed | A |
+| Author2 (2023) | Case study, N=3 institutions | Asian universities | "Institution A showed..." — Supports | "However, in context B..." — Partial | C |
+| Author3 (2022) | Meta-analysis, k=42 | Global | "Pooled effect size d=0.45" — Strong support | "Subgroup analysis revealed..." — Mixed | A |
+```
+
+### Convergence Summary
+
+```markdown
+## Evidence Convergence Summary
+
+| Theme | Sources For | Sources Against | Net | Strength | Confidence |
+|-------|-----------|----------------|-----|----------|-----------|
+| Theme A | 4 (Levels I, II, III, IV) | 1 (Level VI) | +3 | Strong | High |
+| Theme B | 3 (Levels I, III, IV) | 0 | +3 | Strong | High |
+| Theme C | 3 (Levels II, III, VI) | 1 (Level I) | +2 | Contested | Medium |
+| Theme D | 2 (Levels IV, VI) | 1 (Level II) | +1 | Weak | Low |
+| Theme E | 2 (Levels I, III) | 0 | +2 | Moderate | Medium |
+
+### Interpretation Guide
+- **Strong** (≥3 supporting, higher-level evidence): Confident finding
+- **Moderate** (2-3 supporting, mid-level evidence): Likely finding, more evidence welcome
+- **Weak** (1-2 supporting, lower-level evidence): Tentative, needs more research
+- **Contested** (evidence on both sides): Genuine debate, report both sides
+- **Gap** (0 sources): Knowledge gap identified
+```
+
+### Gap Identification
+
+```markdown
+## Knowledge Gaps
+
+| Gap | Type | Implication | Priority |
+|-----|------|-------------|----------|
+| No data on [population X] | Empirical | Cannot generalize to this group | High |
+| Only [method type] used | Methodological | Triangulation needed | Medium |
+| No studies since [year] | Temporal | Evidence may be outdated | Medium |
+| Only studied in [region] | Geographic | Generalizability unknown | Low |
+| No theoretical framework for [finding] | Theoretical | Theory development opportunity | Low |
+```
+
+## Usage Notes
+- Start with the Basic Matrix for initial organization
+- Upgrade to Extended Matrix as synthesis deepens
+- Convergence Summary should directly inform the synthesis narrative
+- Gap Identification feeds into the Discussion section
+- Update the matrix as new sources are added — it is a living document