# Solution Draft

## Product Solution Description
[Short description of the proposed solution. Brief component interaction diagram.]

## Existing/Competitor Solutions Analysis
[Analysis of existing solutions for similar problems, if any.]

## Architecture

[Architecture solution that meets restrictions and acceptance criteria.]

> **Applicability** — the table columns `Pinned Mode/Config` and `API Capability Evidence` apply only to technical-component runs (per SKILL.md → Research Output Class). For non-technical research outputs (concept comparison, market/policy report, investigation answer), this Architecture section may be replaced with a comparison/analysis section that does not use these columns; or the columns may be marked `N/A` per row when the row describes a non-technical "component" (a process, a policy, an organizational construct). For mixed runs, fill the columns only on rows that describe libraries/SDKs/frameworks/services/protocols/data formats/algorithms.

### Component: [Component Name]

| Solution | Tools | Pinned Mode/Config | Advantages | Limitations | Requirements | Security | Cost | API Capability Evidence | Fit |
|----------|-------|--------------------|-----------|-------------|-------------|----------|------|-------------------------|-----|
| [Option 1] | [lib/platform] | [exact mode/config used: inputs, outputs, runtime] | [pros] | [cons] | [intrinsic requirements] | [security] | [cost] | MVE: [link to MVE block]; docs: [Source #] | [Selected / Rejected / Experimental only / Needs user decision — cite exact-fit evidence and disqualifiers] |
| [Option 2] | [lib/platform] | [exact mode/config used] | [pros] | [cons] | [intrinsic requirements] | [security] | [cost] | MVE: [link]; docs: [Source #] | [Selected / Rejected / Experimental only / Needs user decision] |

**Exact-fit evidence**:
- Project constraints checked: [inputs/outputs, operating context, lifecycle, NFRs, acceptance criteria]
- Evidence: [Fact # / Source #]
- Disqualifiers: [none or list]
- Restrictions × Candidate-Modes sub-matrix: see `06_component_fit_matrix.md` § <Candidate Name>
- API capability gates: ✅ MVE saved / ⚠️ partial — see disqualifiers / ❌ no MVE — candidate is Experimental only or Rejected

[Repeat per component]

## Testing Strategy

### Integration / Functional Tests
- [Test 1]
- [Test 2]

### Non-Functional Tests
- [Performance test 1]
- [Security test 1]

## References
[All cited source links]

## Related Artifacts
- Tech stack evaluation: `_docs/01_solution/tech_stack.md` (if Phase 3 was executed)
- Security analysis: `_docs/01_solution/security_analysis.md` (if Phase 4 was executed)