Structured filter grammar: OR via repeated flags, not:, none, AND across flags

[arcaven]

Observation

jr issue list currently offers structured filters for status/team/assignee/reporter/dates/asset — but not --label, --component, --priority, or --type, and no filter supports negation, OR, or emptiness. Everything else forces a drop to hand-written --jql.

Proposal: one boolean mini-grammar, shared by all structured filters

Form	Meaning	JQL emitted
--X a --X b	OR within dimension	X in (a, b)
--X not:a	negation	(X not in (a) OR X is EMPTY) — flag-documented choice
--X none	empty	X is EMPTY
--X all:a --X all:b	AND within dimension (multi-valued fields)	X = a AND X = b
different flags	AND across dimensions	(…) AND (…)
with --jql	structured flags append	<jql> AND (…)

• Prefix style (not:, all:, none) deliberately matches the existing add:/remove: convention on edit flags — one prefix vocabulary across the CLI.
• Applies to: --component (filed separately as the first full implementation), --label, --status, --priority, --type, and the existing single-valued flags gain not:/repetition where meaningful.
• --verbose already prints the request; it should show the final composed JQL so users can graduate to raw --jql when they outgrow the grammar.

This is a design-level issue; happy to split per-flag implementation issues once the grammar is agreed.