Every CommandNode declared a help_id that nothing read; the in-app
`help` body was a single hand-kept catalog block that drifted from
the command set (handoff-12 §2.1).
note_help now iterates the command REGISTRY and translates each
CommandNode's help_id (`help.<id>`), framed by help.intro /
help.dsl_section / help.types_reference. A newly-registered command
appears in `help` automatically — no edit to note_help or a hand-kept
list. Added 20 per-command help entries plus the 3 framing entries;
removed help.in_app_body.
Per-command entries use block scalars: a libyml 0.0.5 scanner bug
panics on long internal space runs in double-quoted scalars, and the
entries are space-aligned.
claude@clouddev1
03dd9003df