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feat: add dal.WithAdapterGeneratedID() insert option

Let consumers say "I don't care what the ID is — let the storage
backend generate it natively" (e.g. Firestore's client-side 20-char
auto-IDs):

- dal.WithAdapterGeneratedID() InsertOption sets a flag adapters
  introspect via the new InsertOptions.PreferAdapterGeneratedID() bool
  accessor.
- Contract (documented on the option): adapters SHOULD use their
  backend's native ID generation if available, and MUST fall back to
  the default random-string generator
  (WithRandomStringKey(DefaultRandomStringIDLength, 5)) otherwise, so
  the option never fails on a compliant adapter. An explicit generator
  option always wins: adapters check IDGenerator() first and only
  consult PreferAdapterGeneratedID() when it is nil.
- dalgo2memory: honor the option via the fallback path (memory has no
  native ID mechanism).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Signed-off-by: Alexander Trakhimenok <alexander.trakhimenok@gmail.com>

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