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1c19e2c034
* fix(compression): place output-style instruction in top-level system, not messages[0] Anthropic-shaped bodies reject a synthetic system-role entry unshifted at messages[0] (the claude passthrough forwards messages unchanged, and the upstream API requires system content in the top-level system parameter). Output styles and the caveman output mode now land their instruction in the top-level system field when it exists (string or content-block array) and only fall back to a trailing system message for OpenAI-shaped bodies, which the claude system-role extraction hoists. Custom endpoint system prompts skip the unshift whenever a top-level system field is present. All compression options stay enabled; placement-only fix. Fixes #12584 * test(compression): cover system-instruction placement branches 4 and 6 Adds direct unit cases for the placement ladder branches that had no coverage, asserting where the instruction lands: - branch 4: merge into a system message at index >= 1, leaving messages[0] untouched (plus the skip-over-a-block-content system message variant). - branch 6: trailing append when the body has neither a `system` field nor a string-content system message. - block-array `system`: appends one block and is idempotent on a second pass (first coverage of the array path of the marker check). Also normalizes a malformed non-string/non-array top-level `system` (e.g. `null`) to "" before the format branch in injectSystemPrompt and injectCustomSystemPrompt. Previously such a body entered the `system` branch, matched neither format, and silently dropped the prompt without falling back to the messages path. Both new guards fail without this change. * chore(compression): add changelog fragment for top-level system placement