docs: add full command reference; fix module path and KernelURL config
- Add docs/commands.md with per-command purpose, step-by-step shell/SDK call sequences, config tables, outputs, and error conditions - Rename module from github.com/you/fc-orchestrator to github.com/kacerr/fc-orchestrator - Add KernelURL field to Config so the download URL is configurable via FC_KERNEL_URL instead of being hardcoded in Init() - Expose FC_KERNEL_URL in the usage string - Add verbose logging of dd/mkfs.ext4/mount/tar calls in buildRootfs Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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