python-sdk: expose canonical app-server types (2026-03-16)

Remove the SDK alias/result layers so the wrapper surface returns canonical generated app-server models directly.

- delete public type alias modules and regenerate v2_all.py against current schema
- return InitializeResponse from metadata and generated Turn from run()
- update docs, examples, notebook, and tests to use canonical generated models and repo-only text extraction helpers

Validation:
- PYTHONPATH=sdk/python/src python3 -m pytest sdk/python/tests
- GH_TOKEN="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" RUN_REAL_CODEX_TESTS=1 PYTHONPATH=sdk/python/src python3 -m pytest sdk/python/tests -rs

Co-authored-by: Codex <noreply@openai.com>

sdk/python/examples/06_thread_lifecycle_and_controls/sync.py

@@ -34,7 +34,7 @@ with Codex(config=runtime_config()) as codex:
             config={"model_reasoning_effort": "high"},
         )
         resumed_result = resumed.turn(TextInput("Continue in one short sentence.")).run()
-        resumed_info = f"{resumed_result.turn_id} {resumed_result.status}"
+        resumed_info = f"{resumed_result.id} {resumed_result.status}"
     except Exception as exc:
         resumed_info = f"skipped({type(exc).__name__})"
 
@@ -42,7 +42,7 @@ with Codex(config=runtime_config()) as codex:
     try:
         forked = codex.thread_fork(unarchived.id, model="gpt-5.4")
         forked_result = forked.turn(TextInput("Take a different angle in one short sentence.")).run()
-        forked_info = f"{forked_result.turn_id} {forked_result.status}"
+        forked_info = f"{forked_result.id} {forked_result.status}"
     except Exception as exc:
         forked_info = f"skipped({type(exc).__name__})"
 
@@ -53,8 +53,8 @@ with Codex(config=runtime_config()) as codex:
         compact_info = f"skipped({type(exc).__name__})"
 
     print("Lifecycle OK:", thread.id)
-    print("first:", first.turn_id, first.status)
-    print("second:", second.turn_id, second.status)
+    print("first:", first.id, first.status)
+    print("second:", second.id, second.status)
     print("read.turns:", len(reading.thread.turns or []))
     print("list.active:", len(listing_active.data))
     print("list.archived:", len(listing_archived.data))