Two fixes: (1) createDisconnectAwareStream now distinguishes graceful max_tokens truncation (partial content already reached the client, upstream closes without a terminal marker → clean stop, no error) from a real empty-content failure (still surfaces the 502). Fixes#7699, keeps #8649 intact. (2) liteEngine's compressToolResults now requires an explicit boolean before overriding step config, instead of letting a malformed value leak through the `??` chain.
Validated in an isolated worktree boarded onto origin/release/v3.8.50 (0 conflicts, 4 files):
- 68/68 tests pass (silent-sse-close-7699, compression/lite, empty-stream-no-content-8649, stream-handler).
- check-file-size, check-changelog-integrity: OK.
- typecheck:core: clean.
- check-complexity / check-cognitive-complexity: OK, both under baseline.
Note: the empty-content Claude error message text changed from "Upstream stream ended without a terminal marker" to "Provider returned empty content" (matches the OpenAI/Responses branch wording) — intentional, documented in the PR.
Co-authored-by: minhlongs <minhlongs@users.noreply.github.com>
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