- Refactored payload assembly to distinguish between incremental sections and terminal results.
- Prevented terminal markers from being incorrectly treated as section labels to avoid payload nesting issues.
- Updated section processing to ignore non-incremental terminal items, resolving incorrectly missing data in output-schema validation.
- Improved terminal item resolution to correctly fallback to the last assistant text when no explicit data is provided.
- Added missing `noteDisplayableThinkingContent` mock function to test fixtures.
- Included `markActivityStart` and `markActivityEnd` methods in status line mocks to match updated controller interfaces.
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