add task skill: guidance on task_plan and task_complete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

task/SKILL.md

@@ -0,0 +1,44 @@
+---
+name: task
+intent: plan, task, todo, steps, checklist, decompose, track
+description: Guidance on using task_plan and task_complete to decompose goals and track progress.
+---
+
+# Task Planning
+
+Use `task_plan` to decompose a multi-step goal into an ordered checklist. Use `task_complete` to mark steps done as you finish them.
+
+## When to plan
+
+- The user asks you to do something with three or more distinct steps
+- The work spans multiple files, tools, or phases
+- You want to show the user a clear picture of what you're about to do before starting
+
+## Workflow
+
+1. Call `task_plan` to create the checklist
+2. Rename `__todo` → `__wip` when work begins (via `file_edit` or shell)
+3. Call `task_complete` after each step finishes
+4. Use `file_*` tools to add, remove, or revise steps as the plan evolves
+5. Rename `__wip` → `__done` when the goal is fully realized
+
+## How to use
+
+```
+execute_tool: task_plan  (or use the built-in task server directly)
+args: ["<goal>", "<step1>", "<step2>", ...]
+```
+
+```
+execute_tool: task_complete
+args: ["<plan-filename>", "<step-title-substring>"]
+```
+
+`task_complete` matches the step title case-insensitively and errors if no unchecked step matches — silent skips are caught.
+
+## Notes
+
+- Plan files live in `pl/` under the ollie mount
+- List plans: `file_glob` on `ollie/pl/`
+- Inspect a plan: `file_read` on the plan file
+- Bulk edits: `file_edit` or `execute_code`