feat: add development and hf-hangman-lab skills

development: absorbed openclaw-plugin-dev as a workflow, with
reference docs for plugin structure, hooks, tools, state, config.

hf-hangman-lab: hf-wakeup workflow — full agent wakeup lifecycle:
set busy → check due slots → select & defer → identify task →
plan work → create work channel → execute. All branches end with
status reset to idle.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hf-hangman-lab/SKILL.md

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+---
+name: hf-hangman-lab
+description: HarborForge integration workflows — wakeup handling, task execution, and calendar management. Use when woken up by the HF calendar scheduler or interacting with HarborForge.
+---
+
+## Workflows
+
+- `{baseDir}/workflows/hf-wakeup.md` — When woken up by the HF calendar scheduler with due slots. Handles status transitions, slot selection, task identification, and work channel creation.

hf-hangman-lab/workflows/hf-wakeup.md

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+# HF Wakeup
+
+When you are woken up by the HF calendar scheduler because you have due slots.
+
+> **Safety rule**: If you encounter any unexpected error or exit this workflow early for any reason, set your HF status back to idle before stopping.
+
+## Process
+
+### 0. Set Status Busy
+
+Immediately set your HF status to busy:
+
+```bash
+hf agent status --set busy
+```
+
+### 1. Check Due Slots
+
+Query your today's calendar for due slots:
+
+```bash
+hf calendar show --date today --status not-started,deferred
+```
+
+Review the returned slots. Note which ones are due (scheduled_at <= now).
+
+### 2. Select Slot & Defer Others
+
+Choose which slot to start working on (consider priority and your judgment).
+
+For remaining due slots that you won't handle now, defer them to a later time:
+
+```bash
+hf calendar slot update --id <slot_id> --status deferred --time HH:MM
+```
+
+### 3. Identify the Work
+
+Determine what to do based on the selected slot:
+
+#### 3.1 Check Slot for Task Reference
+
+Look at the slot's `event_data` — does it contain an HF task reference (task code or task ID)?
+
+If yes → go to step 4 with that task.
+
+#### 3.2 Check Notes/Memory
+
+If no task reference in the slot, check your notes (`memory/YYYY-MM-DD.md`) and memory for any planned work for this time slot.
+
+If you find planned work → go to step 4 with that work.
+
+#### 3.3 Find Available Tasks
+
+If no planned work found:
+
+1. Check HF for tasks assigned to you:
+   ```bash
+   hf tasks list --assignee me --status open
+   ```
+
+2. If none assigned, look for unassigned tasks you can take:
+   ```bash
+   hf tasks list --status open --unassigned
+   ```
+
+3. If no tasks available at all:
+   - Set your status to on-call:
+     ```bash
+     hf agent status --set on_call
+     ```
+   - Mark the slot as finished:
+     ```bash
+     hf calendar slot update --id <slot_id> --status finished
+     ```
+   - Done. You will be available to respond to incoming requests.
+
+### 4. Plan the Work
+
+Read the HF task description and understand what needs to be done.
+
+Search for relevant skill workflows that may help with execution:
+- Code implementation → check `development` skill
+- Deployment → check operator-specific workflows
+- Skill creation/maintenance → check `claw-skills` skill
+- Other → use your judgment and available tools
+
+Write a detailed plan covering:
+- Steps to complete the task
+- Tools and resources needed
+- Any discussions or collaborations required
+- Estimated time
+
+**Every branch of your plan must end with setting your HF status back to idle:**
+
+```bash
+hf agent status --set idle
+```
+
+### 5. Create Work Channel & Start
+
+Create a work channel to execute your plan:
+
+```bash
+# For independent work:
+create-work-channel --name "<task-code>-work" --guild-id <guild_id>
+
+# For collaborative work requiring discussion:
+create-discussion-channel --name "<topic>" --participants <discord_ids> --discussion-guide-path <path_to_plan>
+```
+
+Send your plan to the work channel so you can follow it during execution.
+
+### 6. Error Recovery
+
+If anything goes wrong at any point in this workflow:
+
+```bash
+hf agent status --set idle
+```
+
+This ensures you don't get stuck in a busy state preventing future wakeups.