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OmniRoute/open-sse
Diego Rodrigues de Sa e Souza 9450e03b1e fix(api): exempt test-model requests from Output Styles injection (#6240) (#6511)
* fix(api): exempt test-model requests from Output Styles injection (#6240)

Root cause: handleChatCore's Phase 4A Output Styles injection (chatCore.ts)
was gated only by the operator's global compression.enabled switch,
independent of the per-request x-omniroute-compression header. The
dashboard 'Test model' action (modelTestRunner.ts) never sent that header,
so a globally-enabled Output Style (e.g. 'Ultra terse') always leaked its
system-prompt injection into a plain connection test.

Fix: skip Output Styles injection when the request explicitly opts out via
x-omniroute-compression: off, and always send that header from
buildInternalChatRequest / buildInternalRerankRequest.

Regression guard: tests/integration/test-model-compression-off-6240.test.ts,
tests/unit/model-test-runner-compression-off-6240.test.ts

* chore: sync CHANGELOG to release tip (#6511; bullet re-added at merge)
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