feat(cli): dynamic model/provider selection in init command

[stepandel]

Summary

Replaces the hardcoded Anthropic API key collection in clawup init with a dynamic provider selection flow powered by MODEL_PROVIDERS.

Changes

• packages/cli/commands/init.ts — Provider picker, dynamic model list, provider-aware API key validation and storage

How it works

1. User picks a model provider (Anthropic, OpenAI, Google, OpenRouter)
2. Available models shown from MODEL_PROVIDERS[provider].models
3. For providers with empty model lists (OpenRouter), free-form model input
4. API key collected with provider-specific prefix validation and setup instructions
5. Config stores modelProvider, defaultModel, and the provider's env var as a secret

Backward compatibility

Selecting Anthropic produces equivalent behavior to the previous hardcoded flow.

Depends on: #111 (AGE-148)
Closes AGE-149

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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-149-dynamic-provider-selection

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[stepandel]

🔍 QA Review — APPROVED

All acceptance criteria for AGE-149 verified against the diff:

• ✅ Init wizard shows provider selection (Anthropic, OpenAI, Google, OpenRouter) via MODEL_PROVIDERS
• ✅ Model list dynamically populated from MODEL_PROVIDERS[provider].models
• ✅ Free-form model input for providers with empty models array (OpenRouter)
• ✅ API key validation uses correct prefix per provider (keyPrefix)
• ✅ API key instructions come from KEY_INSTRUCTIONS via providerKeyMap
• ✅ Selected provider and model stored in Pulumi config (modelProvider, defaultModel)
• ✅ API key stored with provider-specific env var name
• ✅ Selecting Anthropic produces identical output to previous behavior
• ✅ Build passes clean (tsc --noEmit on both core and cli)
• ✅ All 26 tests pass

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-149: Dynamic provider/model selection. Provider picker, key validation, Anthropic compat. Build+tests pass.

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