Resolve typed partial-invalidation ergonomics

Parent

Consumers have a precise supported approach to operation and partial-input filtering while exact keys remain canonical.

Prototype focused filters against generated root/branch/leaf/operation identities and concrete data-tagged keys.
Define meaningful partial matching for constructor defaults, custom encoders, and supported request/payload shapes; expressly limit ambiguous cases.
Verify exact/prefix behavior and stable broad invalidation for retained stream policies.
Adopt a narrow public helper only for demonstrated type-safe value; otherwise publish the tested native-filter recipe and bounded limitation decision.
Amend the filter-composition decision if the public contract changes and prove any export through ordinary factory runtime tests and public API compiler fixtures.