chore: refresh Gemini model limits

[c121914yu]

Summary

• Refresh Gemini static preset token limits from the official Gemini model docs.
• Align existing Gemini 3.1 Pro Preview, Gemini 3 Flash Preview, and Gemini 2.5 LLM presets to the documented 1,048,576 input-token / 65,536 output-token limits.
• Leave model membership unchanged; no additions or removals were made.

Evidence

Checked on 2026-06-15:

• https://ai.google.dev/gemini-api/docs/models
• https://ai.google.dev/gemini-api/docs/models/gemini-3.1-pro-preview
• https://ai.google.dev/gemini-api/docs/models/gemini-3-flash-preview
• https://ai.google.dev/gemini-api/docs/models/gemini-2.5-pro
• https://ai.google.dev/gemini-api/docs/models/gemini-2.5-flash
• https://ai.google.dev/gemini-api/docs/models/gemini-2.5-flash-lite

Validation

Passed:

• node .codex/skills/model-provider-updater/scripts/model_provider_presets.mjs inventory --provider Gemini
• git diff --check
• ./node_modules/.bin/eslint packages/infrastructure/src/static-data/models/provider/Gemini/index.ts
• Direct ./node_modules/.bin/tsx import assertion for the six updated Gemini token limits

Known unrelated local failures still reproduce:

• pnpm typecheck fails in sdk/factory because local Zod v3 lacks GlobalMeta, .meta(), and toJSONSchema.
• pnpm test passes 24 files / 165 tests and fails sdk/factory/src/tool-factory.test.ts:280 with default.string(...).meta is not a function; .env.test is also missing locally.