Fix Claude Code hanging in hardened container

Claude Code writes to ~/.claude.json, ~/.cache/, and ~/.npm/ which
failed silently on the read-only root filesystem. Add tmpfs at
/home/storkit so the home dir is writable (the claude-state volume
overlays on top for persistent .claude/ data).

Also fix .dockerignore: use **/target/ to match nested target dirs,
add .storkit/logs/ and **/node_modules/ to prevent multi-GB build
context transfers.

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

.dockerignore

@@ -0,0 +1,11 @@
+# Docker build context exclusions
+**/target/
+**/node_modules/
+frontend/dist/
+.storkit/worktrees/
+.storkit/logs/
+.storkit/work/6_archived/
+.git/
+*.swp
+*.swo
+.DS_Store