fix(schema): drop constructor defaults when deriving update schemas

[MindfulLearner]

Problem: UpdateProject-style schemas are patch APIs, an omitted field means leave unchanged. When such a schema is derived from a create schema via Struct.omit/pick, a field with withConstructorDefault keeps its default. Clients call .make() implicitly on mutate, so the default silently overwrites the value the caller left untouched.

Fix:

• dropConstructorDefault: a Struct.Lambda that removes a field's constructor default. Composable via Struct.map(Struct.omit(...), S.dropConstructorDefault), per review feedback. Replaces the earlier combined omitConstructorDefaults helper.
• makeExactOptional now drops constructor defaults automatically, since exact optionality and an inherited default are contradictory.

Related: https://github.com/macs-holding/configurator/pull/851

discussion: https://discord.com/channels/1083767712431480922/1521940676416241745

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commit: 22972a1

[patroza]

Inheriting the behaviors of fields is desired. In what case are you considering this undesirable or a "bug"?
This pr / issue lacks motivation.

If you need a tool to strip withConstructorDefault then i would suggest to make a helper that just does that so you can simply mapFields(flow(Struct.omit(..), stripConstructorDefaults))