amoghrajesh opened a new pull request, #61251:
URL: https://github.com/apache/airflow/pull/61251

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   Ok hear me out, this might be odd, but since its just one enum it didn't 
feel too wrong.
   
   Instead of creating a shared library or duplicating the enum, we expose 
`DagAttributeTypes` through the Execution API's OpenAPI schema. This allows the 
Task SDK to get the enum values via code generation, keeping SDK and core 
serialization protocol in sync automatically.
   
   Why this approach:
   - SDK only needs 2 values (OP, TASK_GROUP) from the 30+ value 
`DagAttributeTypes` enum
   - Adding a shared library felt heavyweight for just 2 string constants
   - Hardcoding risked typos whcih could lead to broken contract
   - OpenAPI schema generation provides automatic sync mechanism
   
   The `DagAttributeTypes` enum is added to get_extra_schemas() and exposed in 
the API spec. When task-sdk regenerates its models, it gets a properly typed 
enum that matches what core expects for `serialize_for_task_group()`
   
   Trade-off: This enum isn't actually used in API requests/responses - it's 
purely for the serialization. However, since we already generate SDK models 
from the API spec and need these exact values there, reusing the generation 
mechanism felt pragmatic.
   
   I considered the alternative of creating `shared/serialization` library but 
it deemed overkill for 2 values used in few places.
   
   ---
   
   * Read the **[Pull Request 
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become permanently public when merged.
   * For fundamental code changes, an Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvement+Proposals))
 is needed.
   * When adding dependency, check compliance with the [ASF 3rd Party License 
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   * For significant user-facing changes create newsfragment: 
`{pr_number}.significant.rst` or `{issue_number}.significant.rst`, in 
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