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feat(dal): typed id read accessors GetRecordWithID/GetRecordWithDataAndID + GetRecordWithIDIntoData (#76)

Add typed id-bearing read accessors to the Collection layer, now that
RecordWithID/RecordWithDataAndID live in dal (no more dal->record cycle):

- Collection.GetRecordWithID(ctx, s, id) -> RecordWithID[K]
- Collection.GetRecordWithDataAndID(ctx, s, id) -> RecordWithDataAndID[K, *T]
  (Data is the same *T the Record holds)
- dal.GetRecordWithIDIntoData[K,D](ctx, s, key, id, data) -> RecordWithDataAndID[K, D]
  decodes INTO a caller-supplied value, so D may be an interface (factory
  pattern). A free function because Go forbids type parameters on methods.

record.GetWithID is now a thin forwarder to Collection.GetRecordWithID and is
marked Deprecated (its own test keeps it covered via //nolint:staticcheck).

All accessors delegate to GetRecord and propagate the session not-found error.
golangci-lint clean; 100% coverage on new code; dal still does not import
record; README + typed-collection Feature/Plan specs updated; spec lint clean.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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