docs: update skills to use Docker commands after runtime migration (#325)

All skills now reference Docker CLI instead of Apple Container CLI.
Setup skill defaults to Docker with optional /convert-to-apple-container.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/add-parallel/SKILL.md

@@ -13,7 +13,7 @@ Adds Parallel AI MCP integration to NanoClaw for advanced web research capabilit
 User must have:
 1. Parallel AI API key from https://platform.parallel.ai
 2. NanoClaw already set up and running
-3. Container system working (Apple Container or Docker)
+3. Docker installed and running
 
 ## Implementation Steps
 
@@ -224,14 +224,9 @@ Build the container with updated agent runner:
 ./container/build.sh
 ```
 
-The build script will automatically:
-- Try Apple Container first
-- Fall back to Docker if Rosetta is required
-- Import to Apple Container
-
 Verify the build:
 ```bash
-echo '{}' | container run -i --entrypoint /bin/echo nanoclaw-agent:latest "Container OK"
+echo '{}' | docker run -i --entrypoint /bin/echo nanoclaw-agent:latest "Container OK"
 ```
 
 ### 7. Restart Service