pb: built-in fan-out to every clipboard on PATH (pbcopy/wl-copy/xclip
-selection clipboard/xsel -ib/tmux in a session); no HEL_PB script needed.
Override via 'set hel_pb' or $HEL_PB still honored; no sink -> data on stdout.
enc: takes a sub-command like pb. 'enc ls|ld <regex>' encodes the last match
(newest for ld); literal name/id wins first. ls/ld emit bare names when
captured (LKEval.capture), so 'pb ld <re>' copies names. Producers limited to
ls/ld (enc never runs a mutating command). 'set hel_enc_strict 1' errors on
>1 match.
help: 'help [topic]' — grouped overview + per-topic detail (every command, the
entry descriptor, all modes with examples, parent/master chaining, config keys,
files/env, Notion store/load subcommands). Old inline help string removed.
Tests added for all three; native + wasm32 builds green.
ok
4cb3464e86
