The three lite-image keys landed on the deploy branch separately while this
branch was open, so merging left every key defined twice in both price maps.
The merge is clean as text and the file still parses, but JSON keeps the last
occurrence of a repeated key, so the first copy's supported_endpoints,
supported_modalities and supports_system_messages were being dropped without
any error.
Each key is now one entry, placed next to its gemini-3.1-flash-image sibling
rather than at the end of the file.
supports_reasoning goes to false on all three, matching every other Gemini
image model. Leaving it off is not neutral: _supports_factory falls through to
the vertex_ai provider config, which answers true, and reasoning_effort then
gets forwarded to an image endpoint that rejects it. That was fixed for the
rest of the family in 75dd70a678 and these entries had drifted back.
Also fills in what the entries were missing against Google's published
pricing: the Vertex implicit cache read rate, batch rates on the Vertex
routes, and the pdf/video input flags.
The two overlapping test files are folded into one, and the price map suite
grows a duplicate-key guard so the next clean-but-lossy merge fails loudly.
Dated snapshots like o4-mini-2025-04-16 were missing the flex and priority cost keys their base alias carries, so service-tier requests against pinned snapshots were billed at standard rates. Sync the tier keys wherever the snapshot's anchor prices match the base alias, and add a drift regression test.
