[LarsArtmann]

object had no tests at all, and the content codecs' provider metadata/options decode and openrouter's reasoning format labels were only pinned implicitly. These tests pin that behavior before #420 refactors it, so the refactor lands with its safety net already on main.

• object/object_test.go drives both streamers (StreamWithText, StreamWithTool) with a scripted model: partial deltas, parser-repaired truncation, the repair callback, duplicate-emission suppression, schema misses ending in NoObjectGeneratedError, finish-metadata forwarding, stream errors, and consumer-stop propagation (a counter proves the model stops being pulled).
• content_json_test.go pins the provider metadata and provider options decode through a test-registered provider type, including the no-data and empty-map paths and non-string text rejection.
• providers/openrouter/language_model_hooks_test.go pins the openai-responses-v1/xai-responses-v1 reasoning format labels following the model prefix.

No production code changes: all three files pass on main as-is (a0f6ed1), and each test fails when the branch it covers is disabled (mutation-checked), so #420 is checked by these tests rather than merely accompanied by them.

• I have read CONTRIBUTING.md.
• I have created a discussion that was approved by a maintainer (for new features).

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