feat(pulumi): provider-aware config generation

[stepandel]

Summary

Makes generateConfigPatchScript() and the cloud-init script provider-aware, using MODEL_PROVIDERS to determine the correct env var for each provider instead of hardcoding ANTHROPIC_API_KEY.

Changes

• packages/pulumi/src/components/config-generator.ts — Provider-aware env var block in generated Python script
• packages/pulumi/src/components/cloud-init.ts — New modelProvider field in CloudInitConfig, provider-aware bashrc exports

Behavior

• Anthropic — Unchanged. OAuth detection (sk-ant-oat) still works.
• OpenAI — Sets OPENAI_API_KEY
• Google — Sets GOOGLE_API_KEY
• OpenRouter — Sets OPENROUTER_API_KEY

Note: The API key is still passed through the ANTHROPIC_API_KEY cloud-init variable for transport (backward compat), but exported to the correct env var name on the target machine.

Depends on: #111 (AGE-148)
Closes AGE-150

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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-150-provider-aware-config

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[stepandel]

🔍 QA Review — APPROVED

All acceptance criteria for AGE-150 verified against the diff:

• ✅ generateConfigPatchScript() sets correct env var based on provider via MODEL_PROVIDERS[provider].envVar
• ✅ Anthropic OAuth detection (sk-ant-oat) preserved only for Anthropic provider path
• ✅ Non-Anthropic providers get simple config["env"] = {envVar: key} pattern
• ✅ Cloud-init passes correct env var name — modelProvider field added to CloudInitConfig
• ✅ Bashrc exports use provider-aware env var for non-Anthropic providers
• ✅ Backward compat: anthropicApiKey field retained for transport, re-mapped on target
• ✅ Build passes clean (tsc --noEmit on both core and pulumi)
• ✅ 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-150: Provider-aware config generation. Correct env var branching, Anthropic OAuth preserved. Build+tests pass.

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