feat(skill): add team-arch-opt architecture optimization skill

New team skill focused on structural architecture improvements
(dependency cycles, coupling/cohesion, layering violations, God Classes,
dead code). Isomorphic to team-perf-opt with pipeline:
ANALYZE → DESIGN → REFACTOR → VALIDATE + REVIEW.

Roles: coordinator, analyzer, designer, refactorer, validator, reviewer.
Supports single/fan-out/independent/auto parallel modes.
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# Discuss Subagent
Multi-perspective discussion for evaluating refactoring strategies and reviewing code change quality. Used by designer (DISCUSS-REFACTOR) and reviewer (DISCUSS-REVIEW) when complex trade-offs require multi-angle analysis.
## Design Rationale
Complex refactoring decisions (e.g., choosing between dependency inversion vs mediator pattern to break a cycle) and nuanced code review findings (e.g., evaluating whether a temporary coupling increase is acceptable) benefit from structured multi-perspective analysis. This subagent provides that analysis inline without spawning additional team members.
## Invocation
Called by designer, reviewer after their primary analysis when complexity warrants multi-perspective evaluation:
```
Task({
subagent_type: "cli-discuss-agent",
run_in_background: false,
description: "Discuss <round-id>: <topic> for architecture optimization",
prompt: `Conduct a multi-perspective discussion on the following topic.
Round: <round-id>
Topic: <discussion-topic>
Session: <session-folder>
Context:
<relevant-context-from-calling-role>
Perspectives to consider:
- Architecture impact: Will this actually improve the target structural metric?
- Risk assessment: What could break? Dangling references? Behavioral changes? Migration risk?
- Maintainability: Is the refactored code more understandable and maintainable?
- Alternative approaches: Are there simpler or safer ways to achieve the same structural improvement?
Evaluate trade-offs and provide a structured recommendation with:
- Consensus verdict: proceed / revise / escalate
- Confidence level: high / medium / low
- Key trade-offs identified
- Recommended approach with rationale
- Dissenting perspectives (if any)`
})
```
## Round Configuration
| Round | Artifact | Parameters | Calling Role |
|-------|----------|------------|-------------|
| DISCUSS-REFACTOR | <session>/discussions/DISCUSS-REFACTOR.md | Refactoring strategy trade-offs | designer |
| DISCUSS-REVIEW | <session>/discussions/DISCUSS-REVIEW.md | Code review finding validation | reviewer |
## Integration with Calling Role
The calling role is responsible for:
1. **Before calling**: Complete primary analysis, identify the specific trade-off or finding needing discussion
2. **Calling**: Invoke subagent with round ID, topic, and relevant context
3. **After calling**:
| Result | Action |
|--------|--------|
| consensus_reached (proceed) | Incorporate recommendation into output, continue |
| consensus_reached (revise) | Adjust findings/strategy based on discussion insights |
| consensus_blocked (HIGH) | Report to coordinator via message with severity |
| consensus_blocked (MEDIUM) | Include in output with recommendation for revision |
| consensus_blocked (LOW) | Note in output, proceed with original assessment |
## Output Schema
```json
{
"round_id": "<DISCUSS-REFACTOR|DISCUSS-REVIEW>",
"topic": "<discussion-topic>",
"verdict": "<proceed|revise|escalate>",
"confidence": "<high|medium|low>",
"trade_offs": [
{ "dimension": "<architecture|risk|maintainability>", "pro": "<benefit>", "con": "<cost>" }
],
"recommendation": "<recommended-approach>",
"rationale": "<reasoning>",
"dissenting_views": ["<alternative-perspective>"]
}
```
## Error Handling
| Scenario | Resolution |
|----------|------------|
| Single perspective analysis fails | Continue with partial perspectives |
| All analyses fail | Return basic recommendation from calling role's primary analysis |
| Artifact not found | Return error immediately |
| Discussion inconclusive | Return "revise" verdict with low confidence |

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# Explore Subagent
Shared codebase exploration for discovering architecture-critical structures, dependency graphs, module boundaries, and layer organization. Results are cached to avoid redundant exploration across analyzer and refactorer roles.
## Design Rationale
Codebase exploration is a read-only operation shared between analyzer (mapping structural issues) and refactorer (understanding implementation context). Caching explorations avoids redundant work when refactorer re-explores structures the analyzer already mapped.
## Invocation
Called by analyzer, refactorer after needing codebase context for architecture analysis or implementation:
```
Task({
subagent_type: "cli-explore-agent",
run_in_background: false,
description: "Explore codebase for architecture-critical structures in <target-scope>",
prompt: `Explore the codebase to identify architecture-critical structures.
Target scope: <target-scope>
Session: <session-folder>
Focus: <exploration-focus>
Tasks:
1. Map the module structure, entry points, and layer boundaries within scope
2. Build dependency graph (import/require relationships between modules)
3. Identify architectural patterns (layering, dependency injection, event-driven, plugin architecture)
4. Note any existing abstractions, interfaces, and module boundaries
5. List key files with their roles, layer assignment, and dependency relationships
Output a structured exploration report with:
- Module map (key files, their relationships, and layer assignments)
- Dependency graph (directed edges between modules, cycle indicators)
- Layer structure (identified layers and their boundaries)
- Existing architectural patterns found
- Architecture-relevant configuration (path aliases, barrel exports, module boundaries)`
})
```
## Cache Mechanism
### Cache Index Schema
`<session-folder>/explorations/cache-index.json`:
```json
{
"entries": [
{
"key": "<scope-hash>",
"scope": "<target-scope>",
"focus": "<exploration-focus>",
"timestamp": "<ISO-8601>",
"result_file": "<hash>.md"
}
]
}
```
### Cache Lookup Rules
| Condition | Action |
|-----------|--------|
| Exact scope+focus match exists | Return cached result from <hash>.md |
| No match | Execute subagent, cache result to <hash>.md, update index |
| Cache file missing but index has entry | Remove stale entry, re-execute |
| Cache older than current session | Use cached (explorations are stable within session) |
## Integration with Calling Role
The calling role is responsible for:
1. **Before calling**: Determine target scope and exploration focus
2. **Calling**: Check cache first, invoke subagent only on cache miss
3. **After calling**:
| Result | Action |
|--------|--------|
| Exploration successful | Use findings to inform analysis/implementation |
| Exploration partial | Use available findings, note gaps |
| Exploration failed | Proceed without exploration context, use direct file reading |
## Output Schema
```json
{
"scope": "<target-scope>",
"module_map": [
{ "file": "<path>", "role": "<description>", "layer": "<presentation|domain|data|infra>", "dependency_graph": { "imports": ["<path>"], "imported_by": ["<path>"] } }
],
"dependency_graph": {
"nodes": ["<module-path>"],
"edges": [{ "from": "<path>", "to": "<path>", "type": "<import|re-export|dynamic>" }],
"cycles": [["<path-a>", "<path-b>", "<path-a>"]]
},
"layer_structure": [
{ "layer": "<name>", "modules": ["<path>"], "violations": ["<description>"] }
],
"existing_patterns": [
{ "type": "<pattern>", "location": "<file:line>", "description": "<what>" }
],
"investigation_targets": ["<file-or-pattern>"]
}
```
## Error Handling
| Scenario | Resolution |
|----------|------------|
| Single exploration angle fails | Continue with partial results |
| All exploration fails | Return basic result from direct file listing |
| Target scope not found | Return error immediately |
| Cache corrupt | Clear cache-index.json, re-execute |