feat(skills): add Trello skill for board/list/card management

skills/trello/SKILL.md

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+---
+name: trello
+description: Manage Trello boards, lists, and cards via the Trello REST API.
+homepage: https://developer.atlassian.com/cloud/trello/rest/
+metadata: {"clawdis":{"emoji":"📋","requires":{"env":["TRELLO_API_KEY","TRELLO_TOKEN"]}}}
+---
+
+# Trello Skill
+
+Manage Trello boards, lists, and cards directly from Clawdis.
+
+## Setup
+
+1. Get your API key: https://trello.com/app-key
+2. Generate a token (click "Token" link on that page)
+3. Set environment variables:
+   ```bash
+   export TRELLO_API_KEY="your-api-key"
+   export TRELLO_TOKEN="your-token"
+   ```
+
+## Usage
+
+All commands use curl to hit the Trello REST API.
+
+### List boards
+```bash
+curl -s "https://api.trello.com/1/members/me/boards?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" | jq '.[] | {name, id}'
+```
+
+### List lists in a board
+```bash
+curl -s "https://api.trello.com/1/boards/{boardId}/lists?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" | jq '.[] | {name, id}'
+```
+
+### List cards in a list
+```bash
+curl -s "https://api.trello.com/1/lists/{listId}/cards?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" | jq '.[] | {name, id, desc}'
+```
+
+### Create a card
+```bash
+curl -s -X POST "https://api.trello.com/1/cards?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" \
+  -d "idList={listId}" \
+  -d "name=Card Title" \
+  -d "desc=Card description"
+```
+
+### Move a card to another list
+```bash
+curl -s -X PUT "https://api.trello.com/1/cards/{cardId}?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" \
+  -d "idList={newListId}"
+```
+
+### Add a comment to a card
+```bash
+curl -s -X POST "https://api.trello.com/1/cards/{cardId}/actions/comments?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" \
+  -d "text=Your comment here"
+```
+
+### Archive a card
+```bash
+curl -s -X PUT "https://api.trello.com/1/cards/{cardId}?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" \
+  -d "closed=true"
+```
+
+## Notes
+
+- Board/List/Card IDs can be found in the Trello URL or via the list commands
+- The API key and token provide full access to your Trello account - keep them secret!
+- Rate limits: 100 requests per 10 seconds per token
+
+## Examples
+
+```bash
+# Get all boards
+curl -s "https://api.trello.com/1/members/me/boards?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN&fields=name,id" | jq
+
+# Find a specific board by name
+curl -s "https://api.trello.com/1/members/me/boards?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" | jq '.[] | select(.name | contains("Work"))'
+
+# Get all cards on a board
+curl -s "https://api.trello.com/1/boards/{boardId}/cards?key=$TRELLO_API_KEY&token=$TRELLO_TOKEN" | jq '.[] | {name, list: .idList}'
+```