Register an existing repo as a program from the /programs page — the web
equivalent of `castle program add`. An inline form with an editable,
autocompleting path bar browses the *server's* filesystem (a browser's own
file dialog only sees the client machine) and also accepts a git URL.
- core: extract the adopt logic (target parsing, stack/command detection,
ProgramSpec build) into castle_core.adopt so the CLI and API share it; the
CLI's add.py now delegates to it.
- castle-api: GET /fs/browse (directory listing, per-entry stat errors skipped
so one unreadable child can't 403 the dir) and POST /programs/adopt.
- app: AddProgramForm + Add-program button on the Programs page; useBrowse /
useAdoptProgram hooks.
Also tidy ProgramCard: deployments render below the description, and the
deployment name label is hidden when it matches the program title.
Paul Payne
a9f1e5b099