fix(memory): handle SELF_MANAGED override type in _wrap_configuration

[abhu85]

Summary

Fixes Bug #1 from issue #212: The _wrap_configuration method was crashing with ValueError: 'SELF_MANAGED' is not a valid OverrideType when trying to modify CUSTOM strategies with SELF_MANAGED configuration type.

Root Cause

The code attempted to convert override_type string to OverrideType enum without handling the case where override_type is not a valid enum value (e.g., 'SELF_MANAGED' which is a valid configuration type but not defined in the OverrideType enum).

Changes

1. Added _try_get_override_type() helper method that safely converts override_type string to OverrideType enum, returning None for invalid/unknown values
2. Updated _wrap_configuration() to use this helper and fall through to pass-through behavior when override_enum is None or not in the wrapper key dictionaries
3. Added missing else clauses in the consolidation and reflection handling to ensure configuration is passed through for unknown override types

Tests

Added 3 new tests:

• test_wrap_configuration_custom_self_managed - verifies SELF_MANAGED configs work without crashing
• test_try_get_override_type_valid - verifies valid override types are converted correctly
• test_try_get_override_type_invalid - verifies invalid override types return None

All 110 existing tests continue to pass.

Test Plan

• All existing _wrap_configuration tests pass (7 tests)
• All memory client tests pass (110 tests)
• New tests specifically cover SELF_MANAGED scenario
• Tests verify extraction, consolidation, and reflection all pass through correctly

Reproduction

Before this fix:

from bedrock_agentcore.memory import MemoryClient
client = MemoryClient(region_name='us-west-2')
client.modify_strategy(
    memory_id='BasicTestMemory2-q8ughRAgdr',
    strategy_id='self_managed_v4ze2-G2RJC0H1bA',
    configuration={
        'extraction': {
            'historicalContextWindowSize': 10,
            'triggerEveryNMessages': 5
        }
    }
)
# Crashes with: ValueError: 'SELF_MANAGED' is not a valid OverrideType

After this fix, the above code works without crashing.

Fixes #212 (Bug #1)

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