feat: basecamp-project skill

.pi/gsd/templates/research-project/ARCHITECTURE.md

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+# Architecture Research Template
+
+Template for `.planning/research/ARCHITECTURE.md` - system structure patterns for the project domain.
+
+<template>
+
+```markdown
+# Architecture Research
+
+**Domain:** [domain type]
+**Researched:** [date]
+**Confidence:** [HIGH/MEDIUM/LOW]
+
+## Standard Architecture
+
+### System Overview
+
+```
+┌─────────────────────────────────────────────────────────────┐
+│                        [Layer Name]                          │
+├─────────────────────────────────────────────────────────────┤
+│  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐        │
+│  │ [Comp]  │  │ [Comp]  │  │ [Comp]  │  │ [Comp]  │        │
+│  └────┬────┘  └────┬────┘  └────┬────┘  └────┬────┘        │
+│       │            │            │            │              │
+├───────┴────────────┴────────────┴────────────┴──────────────┤
+│                        [Layer Name]                          │
+├─────────────────────────────────────────────────────────────┤
+│  ┌─────────────────────────────────────────────────────┐    │
+│  │                    [Component]                       │    │
+│  └─────────────────────────────────────────────────────┘    │
+├─────────────────────────────────────────────────────────────┤
+│                        [Layer Name]                          │
+│  ┌──────────┐  ┌──────────┐  ┌──────────┐                   │
+│  │ [Store]  │  │ [Store]  │  │ [Store]  │                   │
+│  └──────────┘  └──────────┘  └──────────┘                   │
+└─────────────────────────────────────────────────────────────┘
+```
+
+### Component Responsibilities
+
+| Component | Responsibility | Typical Implementation   |
+| --------- | -------------- | ------------------------ |
+| [name]    | [what it owns] | [how it's usually built] |
+| [name]    | [what it owns] | [how it's usually built] |
+| [name]    | [what it owns] | [how it's usually built] |
+
+## Recommended Project Structure
+
+```
+src/
+├── [folder]/           # [purpose]
+│   ├── [subfolder]/    # [purpose]
+│   └── [file].ts       # [purpose]
+├── [folder]/           # [purpose]
+│   ├── [subfolder]/    # [purpose]
+│   └── [file].ts       # [purpose]
+├── [folder]/           # [purpose]
+└── [folder]/           # [purpose]
+```
+
+### Structure Rationale
+
+- **[folder]/:** [why organized this way]
+- **[folder]/:** [why organized this way]
+
+## Architectural Patterns
+
+### Pattern 1: [Pattern Name]
+
+**What:** [description]
+**When to use:** [conditions]
+**Trade-offs:** [pros and cons]
+
+**Example:**
+```typescript
+// [Brief code example showing the pattern]
+```
+
+### Pattern 2: [Pattern Name]
+
+**What:** [description]
+**When to use:** [conditions]
+**Trade-offs:** [pros and cons]
+
+**Example:**
+```typescript
+// [Brief code example showing the pattern]
+```
+
+### Pattern 3: [Pattern Name]
+
+**What:** [description]
+**When to use:** [conditions]
+**Trade-offs:** [pros and cons]
+
+## Data Flow
+
+### Request Flow
+
+```
+[User Action]
+    ↓
+[Component] → [Handler] → [Service] → [Data Store]
+    ↓              ↓           ↓            ↓
+[Response] ← [Transform] ← [Query] ← [Database]
+```
+
+### State Management
+
+```
+[State Store]
+    ↓ (subscribe)
+[Components] ←→ [Actions] → [Reducers/Mutations] → [State Store]
+```
+
+### Key Data Flows
+
+1. **[Flow name]:** [description of how data moves]
+2. **[Flow name]:** [description of how data moves]
+
+## Scaling Considerations
+
+| Scale         | Architecture Adjustments                |
+| ------------- | --------------------------------------- |
+| 0-1k users    | [approach - usually monolith is fine]   |
+| 1k-100k users | [approach - what to optimize first]     |
+| 100k+ users   | [approach - when to consider splitting] |
+
+### Scaling Priorities
+
+1. **First bottleneck:** [what breaks first, how to fix]
+2. **Second bottleneck:** [what breaks next, how to fix]
+
+## Anti-Patterns
+
+### Anti-Pattern 1: [Name]
+
+**What people do:** [the mistake]
+**Why it's wrong:** [the problem it causes]
+**Do this instead:** [the correct approach]
+
+### Anti-Pattern 2: [Name]
+
+**What people do:** [the mistake]
+**Why it's wrong:** [the problem it causes]
+**Do this instead:** [the correct approach]
+
+## Integration Points
+
+### External Services
+
+| Service   | Integration Pattern | Notes     |
+| --------- | ------------------- | --------- |
+| [service] | [how to connect]    | [gotchas] |
+| [service] | [how to connect]    | [gotchas] |
+
+### Internal Boundaries
+
+| Boundary              | Communication       | Notes            |
+| --------------------- | ------------------- | ---------------- |
+| [module A ↔ module B] | [API/events/direct] | [considerations] |
+
+## Sources
+
+- [Architecture references]
+- [Official documentation]
+- [Case studies]
+
+---
+*Architecture research for: [domain]*
+*Researched: [date]*
+```
+
+</template>
+
+<guidelines>
+
+**System Overview:**
+- Use ASCII box-drawing diagrams for clarity (├── └── │ ─ for structure visualization only)
+- Show major components and their relationships
+- Don't over-detail - this is conceptual, not implementation
+
+**Project Structure:**
+- Be specific about folder organization
+- Explain the rationale for grouping
+- Match conventions of the chosen stack
+
+**Patterns:**
+- Include code examples where helpful
+- Explain trade-offs honestly
+- Note when patterns are overkill for small projects
+
+**Scaling Considerations:**
+- Be realistic - most projects don't need to scale to millions
+- Focus on "what breaks first" not theoretical limits
+- Avoid premature optimization recommendations
+
+**Anti-Patterns:**
+- Specific to this domain
+- Include what to do instead
+- Helps prevent common mistakes during implementation
+
+</guidelines>