The help renderer appends "(default: X)" whenever the option field declares a
schema default, so descriptions that also spell the default out print it twice:
--block-size <value> Power-of-two block size from 256 to 65536 bytes
(default 4096) (default: 4096)
Remove the hand-written default from the eleven options that own a schema
default across inspect-byte-entropy, inspect-devicetree,
inspect-packet-capture, inspect-packet-fields, inspect-signal-decoders and
decode-signal-recording, matching the rule in cliDecimalField's contract that
the domain field owns bounds, defaults and help.
Options without a schema default keep their prose: --match_limit, --line_limit,
--limit and --packet_limit are nullable or optional, so the renderer emits no
annotation and the description is the only place the effective value appears.
Add a boundary test asserting each such option states its default exactly once,
so a restated default cannot come back unnoticed.
morluto