feat: add claude code plugin support (#1293)

Co-authored-by: Claude <noreply@anthropic.com>

packages/claude-code-plugin/commands/command-pipeline.md

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+Execute a pipeline of commands based on a specification.
+
+Arguments: $ARGUMENTS
+
+## Command Pipeline Execution
+
+Parse pipeline specification from arguments. Supported formats:
+
+### Simple Pipeline
+`init → expand-all → sprint-plan`
+
+### Conditional Pipeline  
+`status → if:pending>10 → sprint-plan → else → next`
+
+### Iterative Pipeline
+`for:pending-tasks → expand → complexity-check`
+
+### Smart Pipeline Patterns
+
+**1. Project Setup Pipeline**
+```
+init [prd] → 
+expand-all → 
+complexity-report → 
+sprint-plan → 
+show first-sprint
+```
+
+**2. Daily Work Pipeline**
+```
+standup →
+if:in-progress → continue →
+else → next → start
+```
+
+**3. Task Completion Pipeline**
+```
+complete [id] →
+git-commit →
+if:blocked-tasks-freed → show-freed →
+next
+```
+
+**4. Quality Check Pipeline**
+```
+list in-progress →
+for:each → check-idle-time →
+if:idle>1day → prompt-update
+```
+
+### Pipeline Features
+
+**Variables**
+- Store results: `status → $count=pending-count`
+- Use in conditions: `if:$count>10`
+- Pass between commands: `expand $high-priority-tasks`
+
+**Error Handling**
+- On failure: `try:complete → catch:show-blockers`
+- Skip on error: `optional:test-run`
+- Retry logic: `retry:3:commit`
+
+**Parallel Execution**
+- Parallel branches: `[analyze | test | lint]`
+- Join results: `parallel → join:report`
+
+### Execution Flow
+
+1. Parse pipeline specification
+2. Validate command sequence
+3. Execute with state passing
+4. Handle conditions and loops
+5. Aggregate results
+6. Show summary
+
+This enables complex workflows like:
+`parse-prd → expand-all → filter:complex>70 → assign:senior → sprint-plan:weighted`