fix(docker): include docker/ assets in npm package

The docker/ directory was missing from package.json files array,
causing all ccs docker commands to fail after npm install with
"Missing bundled Docker asset" error. Also add .npmignore exception
for docker/*.sh since the blanket *.sh exclusion stripped the
entrypoint script.

Closes #829

.npmignore

@@ -12,9 +12,10 @@ docs/
 .gitignore
 .gitmodules
 
-# Development tools (keep installer scripts)
+# Development tools (keep installer scripts and docker entrypoints)
 *.sh
 !installers/*.sh
+!docker/*.sh
 
 # Logs and temp
 *.log

package.json

@@ -35,6 +35,7 @@
     "lib/",
     "scripts/",
     "config/",
+    "docker/",
     ".claude/",
     "VERSION",
     "README.md",