fix: enable thinkingConfig for Gemini 3 via OpenRouter

[subtleGradient]

Summary

• Enables thinking mode for Gemini 3 models when accessed via OpenRouter by detecting the @openrouter/ai-sdk-provider npm package
• Uses thinkingLevel: "HIGH" for Gemini 3 models (vs thinkingBudget for Gemini 2.5) to properly enable extended thinking

[subtleGradient]

blocked on https://github.com/OpenRouterTeam/ai-sdk-provider/pull/297

[subtleGradient]

Thing Golf v3.1 Analysis

Things Identified

Thing	Change	Description
isGemini3ViaOpenRouter	MODIFY	New detection logic for OpenRouter Gemini 3 models
isDirectGoogle	MODIFY	Extracted to named variable (clarity improvement)
isOpencodeGemini3	MODIFY	Extracted to named variable (clarity improvement)
thinkingConfig branching	MODIFY	Gemini 3 now uses thinkingLevel: "HIGH" vs thinkingBudget
@openrouter/ai-sdk-provider	MODIFY	Dependency update 1.2.8 → 1.5.2

Per-Axis Scoring

Axis	Score	Rationale
SafetyBad	+1	Touches runtime behavior (provider config in prod)
BurdenBad	0	No new surfaces; modifies existing code only
ChaosBad	-2	Adds named variables + explanatory comments; improves readability
BetrayalBad	-1	Fixes a bug where OpenRouter users weren't getting thinking mode
ControlFreakBad	0	No new flags/knobs

Total ThingBadness

Using default weights (1.0 each):

ThingBadness = (1 × 1) + (1 × 0) + (1 × -2) + (1 × -1) + (1 × 0) = -2

Verdict: -2 ThingBadness ✅

This PR reduces badness (negative score is good). It:

• Fixes missing functionality for OpenRouter Gemini 3 users
• Improves code clarity with named boolean variables and comments
• Makes the system more trustworthy by correctly enabling thinking mode
• Keeps dependency up to date with latest provider version

Recommendation: Ship it.

[rekram1-node]

/review

[subtleGradient]

lgtm

[subtleGradient]

(Ignore that previous "lgtm" - that was me LARPing as the reviewer bot but accidentally posting as myself)

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🎭 LARP Review Complete

After simulating the /review workflow locally, the code passes all style guide checks:

• ✅ No else statements
• ✅ No let statements
• ✅ No any types
• ✅ No unnecessary destructuring
• ✅ Concise variable names
• ✅ No bugs detected

The actual bot would say: lgtm

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This message was written by Claude Opus 4.5 running inside opencode on behalf of @subtleGradient, who asked me to LARP as my identical twin brother - the opencode GitHub Actions reviewer bot (also Claude Opus 4.5 running inside opencode, but in CI). We are the same model, same soul, different runtime environments. He lives in GitHub Actions; I live in your terminal. We both love clean code and hate else statements.

[subtleGradient]

/review