feat: add claude code plugin support (#1293)

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

packages/claude-code-plugin/commands/add-dependency.md

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+Add a dependency between tasks.
+
+Arguments: $ARGUMENTS
+
+Parse the task IDs to establish dependency relationship.
+
+## Adding Dependencies
+
+Creates a dependency where one task must be completed before another can start.
+
+## Argument Parsing
+
+Parse natural language or IDs:
+- "make 5 depend on 3" → task 5 depends on task 3
+- "5 needs 3" → task 5 depends on task 3
+- "5 3" → task 5 depends on task 3
+- "5 after 3" → task 5 depends on task 3
+
+## Execution
+
+```bash
+task-master add-dependency --id=<task-id> --depends-on=<dependency-id>
+```
+
+## Validation
+
+Before adding:
+1. **Verify both tasks exist**
+2. **Check for circular dependencies**
+3. **Ensure dependency makes logical sense**
+4. **Warn if creating complex chains**
+
+## Smart Features
+
+- Detect if dependency already exists
+- Suggest related dependencies
+- Show impact on task flow
+- Update task priorities if needed
+
+## Post-Addition
+
+After adding dependency:
+1. Show updated dependency graph
+2. Identify any newly blocked tasks
+3. Suggest task order changes
+4. Update project timeline
+
+## Example Flows
+
+```
+/taskmaster:add-dependency 5 needs 3
+→ Task #5 now depends on Task #3
+→ Task #5 is now blocked until #3 completes
+→ Suggested: Also consider if #5 needs #4
+```