Give each apl-feed command its own contextual help#118
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Replace the single global usage dump with a concise top-level command index plus per-command and per-subcommand --help. Running a command group with no subcommand now prints that command's help instead of a dead-end error; usage errors exit 2.
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Running
apl-feedwith no arguments now prints a concise list of commands instead of the entire command tree, and every command and subcommand has its own--help. Running a command group without a subcommand (for exampleapl-feed claim) now prints that command's help instead of a terse "requires a subcommand" error.Usage errors — a missing or unknown subcommand, an unknown command, or a missing required argument — print the relevant help to stderr and exit 2, while
--helpprints to stdout and exits 0.