futpib / claugrep / 25080078913

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refactor: colocate target parse/serialize with FromStr + Display

Replaces `Target::as_str()` with `impl Display for Target` and adds
`impl FromStr for Target`, plus a `QualifiedTarget { target, subtype }`
newtype with the same trait pair. `parse_targets` now drives off
`QualifiedTarget::from_str` instead of a hand-rolled match table, and
the dump/tail/last/search output sites format labels via Display.

Side effect: subtype-bearing labels in output now use `.` consistently
with input syntax (`[system.away_summary]` instead of
`[system:away_summary]`), so what you type in `--targets` matches what
you read back in the output.

150 of 151 new or added lines in 4 files covered. (99.34%)

3142 of 3651 relevant lines covered (86.06%)

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