feat: add --json to alias ls, class ls, watch ls - #86
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The list commands were text-only. Add --json so nicknames, class pins, and the watch list are scriptable, matching scan/events/etc. Each store serializes with a canonical string MAC (net.HardwareAddr marshals as raw bytes otherwise) and emits [] on an empty store, never null. class ls --json uses the lowercase canonical token (e.g. "mobile"), so it round-trips back into class set. A shared newListCmd builds the three ls subcommands (same shape, one --json flag), so the flag isn't wired three times. Closes #72
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What and why
The list commands (
alias ls,class ls,watch ls) were text-only. This adds--jsonso they're scriptable, matching the rest of the read commands.net.HardwareAddrmarshals as raw bytes otherwise) and emits[]on an empty store, nevernull.class ls --jsonuses the lowercase canonical token (e.g."mobile"), so it round-trips straight back intonetwp class set.newListCmdhelper builds the threelssubcommands (same shape, one--jsonflag) instead of wiring the flag three times.Closes #72
Risks
None. Additive read-only flags; the default text output is unchanged.
Checklist
TestListJSONMappers: empty→[], MAC/class mapping)README.mdandREADME.pt-BR.mdupdated in this PR