ork now operates solely as a 9P client against ork-server; all org
intelligence lives in the server. Remove the local file-parsing command
layer (commands.rs) and its org-ast/org-parser/orkmode-core/serde deps.
Base verbs speak raw 9P: ls, read, write, rdwr. Address resolves from
--addr, then $ORK_ADDR, then tcp://localhost:5640.
Add friendly commands, all thin compositions of the base 9P operations:
docs, sections, todos, agenda, get, set, add (--parent), mkdoc, reload.
Fix the directory-listing parser in client.rs: the stat-entry name offset
double-counted the size field (pos + 2 + 41 instead of pos + 41), so ls
returned nothing. Handle a downstream reader closing early (e.g. | head)
by treating BrokenPipe as a clean exit instead of panicking.
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