Add nix run .#local-dev app that wraps contrib/local-dev.sh for the tmux orchestrator. Update the devshell hook to read the owner DID from nix/vm-data/atproto/owner-did (if present from a previous session) and construct TANGLED_LABEL_DEFAULTS and TANGLED_LABEL_GFI env vars.
Also add tmux to devshell nativeBuildInputs and ensure the VM launcher creates the atproto data directory when in local-dev mode.
Set TANGLED_DEV=true in local-dev mode so the appview uses DevDirectory for .test TLD handle resolution via the local PDS.
Signed-off-by: Alessio Caiazza code.git@caiazza.info