Feature/bare generators

[JesusMcCloud]

• Matrix testing: nameless data / property layers
  • data and property now have overloads that omit the leading name (e.g. data(listOf(...)) test { ... },
    property(Arb.int()) - { ... }). A nameless layer skips the intermediate grouping node and registers its rows
    directly in the surrounding scope. A named layer remains shorthand for wrapping a nameless one in a labeled
    suite. Available in both regular and compact scopes, across all overloads (Iterable/Sequence,
    replayIndex(es) / replay(s), - { } and test { }).
• Matrix testing: replay info shows layer kind
  • Error replay info frames are now tagged with their layer kind — (property) or (data) — for named and
    nameless layers alike (e.g. (property) seed: ...). Nameless layers print the marker without a name; the
    general failure/report path still shows no synthesized segment.
• Matrix testing: replace layer separator slash with TestBalloon separator arrow
• Matrix testing: replay info shows the full path
  • The Error replay info path now mirrors the compact report path in full — enclosing grouping suites
    ("name" - { ... }) and plain test leaves appear as path segments, not just the replayable data/property
    layers. Only replayable layers still emit a - ... argument line; group-only chains produce no replay block.

[JesusMcCloud]

manually merged