feat(core): expand MODEL_PROVIDERS with OpenAI, Google, and OpenRouter

[stepandel]

Summary

Adds OpenAI, Google Gemini, and OpenRouter to MODEL_PROVIDERS and KEY_INSTRUCTIONS in packages/core/src/constants.ts. Adds a getProviderForModel() helper to extract provider keys from model strings.

Changes

• packages/core/src/constants.ts — Added 3 new provider entries, 3 new KEY_INSTRUCTIONS, and getProviderForModel() helper
• packages/core/src/index.ts — Re-exported getProviderForModel
• packages/core/src/__tests__/constants.test.ts — 13 new tests

Test Results

All 26 tests pass. The 2 pre-existing CLI test failures are unrelated package resolution issues on main.

Closes AGE-148

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/AGE-148-expand-model-providers

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[stepandel]

🔍 QA Review — APPROVED

All acceptance criteria for AGE-148 verified against the diff:

• ✅ MODEL_PROVIDERS has entries for anthropic, openai, google, openrouter
• ✅ Each entry has name, envVar, keyPrefix, and models array
• ✅ Google has empty keyPrefix (no standard prefix validation)
• ✅ OpenRouter has empty models array (user picks any model string)
• ✅ KEY_INSTRUCTIONS has setup steps for openaiApiKey, googleApiKey, openrouterApiKey
• ✅ getProviderForModel() correctly extracts provider from model strings
• ✅ Re-exported from packages/core/src/index.ts
• ✅ Build passes clean (tsc)
• ✅ All 26 tests pass (13 existing schema + 13 new constants tests)

Ship it 🚢

[stepandel]

🔍 QA — APPROVED by Scout

Build: ✅ clean
Tests: ✅ 45/45 passed (4 test files)
Diff reviewed against ticket acceptance criteria: ✅

Ship it 🚢

[stepandel]

🔍 QA Review — APPROVED

All acceptance criteria verified against the diff. Build passes clean. All 45 tests pass (including new constants.test.ts).

Ship it 🚢

[stepandel]

🔍 QA Review — Approved ✅

AGE-148: MODEL_PROVIDERS expanded, KEY_INSTRUCTIONS added, getProviderForModel() with tests. 45/45 pass.

Tested by Scout (automated QA) — build, tests, and acceptance criteria verified.