fix(tests): use "compaction" as ContextManagement type value

[rmotgi1227]

Summary

Fixes #2868.

The ContextManagement TypedDict's type field is documented to accept only "compaction":

The context management entry type. Currently only 'compaction' is supported.

The auto-generated test stubs in tests/api_resources/test_responses.py used the placeholder string "type" in four context_management fixtures, which is not a valid value. This means the tests were constructing payloads that the API would reject, not exercising the actual accepted value.

Change

tests/api_resources/test_responses.py — replace "type": "type" → "type": "compaction" at lines 35, 123, 448, and 536 (all four context_management dict literals in the sync and async test variants).

Verification

# Before: would hit a 400 from the API — "type" is not a valid context management type
context_management=[{"type": "type", "compact_threshold": 1000}]

# After: matches the only accepted value per the type definition
context_management=[{"type": "compaction", "compact_threshold": 1000}]