#13006: fix(provider): disable reasoning tags for gemini-3-pro variants to fix tool calls

fix: [Historical context: a different model called tool "read" with arguments: { "file_path" https://github.com/openclaw/openclaw/issues/3344 <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates `isReasoningTagProvider` to return `false` for `google-antigravity` provider strings that include `gemini-3-pro` or `gemini-3-pro-low`, effectively disabling `<think>/<final>` reasoning-tag prompting for those Gemini variants to avoid malformed tool calls. The change affects downstream behavior wherever `isReasoningTagProvider()` is used to decide whether to enforce a final tag or to include reasoning-tag hints in the system prompt (e.g., reply runner and embedded runner code paths). <h3>Confidence Score: 4/5</h3> - This PR is mostly safe to merge, with a small but real documentation/comment issue to fix. - The functional change is narrowly scoped to a specific provider/model substring and is wired through existing helper usage. The main concrete issue is the placeholder issue URL (`issues/XXXXX`) in the code comment, which should be corrected before merging. - src/utils/provider-utils.ts <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->