feat: add experimental OpenAI wizard runner

[richardsolomou]

This adds an experimental OpenAI Agents SDK path for the wizard while keeping Claude as the default runner.

What changed

• adds OpenAI provider selection for the wizard, using the same PostHog login / personal API key flow and LLM gateway auth by default, with direct OpenAI-compatible overrides when explicitly configured
• adds an OpenAI tool bridge for local file/package/env operations plus SDK compatibility shims for strict tool schemas, nullable usage details, and a higher turn cap for longer wizard runs
• updates the TUI to show the active provider and provider-specific outage messaging, including OpenAI status checks when the OpenAI runner is active
• relaxes the post-OAuth API parsing path so login can complete against the current project and user payload shapes

Test plan

• pnpm build
• pnpm jest src/lib/__tests__/agent-interface.test.ts src/lib/__tests__/openai-sdk-compat.test.ts src/lib/__tests__/openai-function-tools.test.ts --runInBand
• pnpm jest src/lib/__tests__/api.test.ts --runInBand
• pnpm jest src/ui/tui/__tests__/store.test.ts --runInBand
• pnpm jest src/lib/health-checks/__tests__/health-checks.test.ts --runInBand

[github-actions]

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