feat(droid): wire OAuth proxy via customModels + fix subscription gate

[twaldin]

Summary

• Root cause fixed: plain model slugs (gpt-5.5 etc.) in droid session settings trigger the factory.ai subscription gate. The custom: prefix signals BYO-provider mode and skips the check entirely.
• toCustomModelId() in src/adapters/droid.ts: converts a bare slug → custom:{slug}-0 (droid auto-assigns this ID to unique entries in customModels). Already-prefixed IDs pass through unchanged.
• ~/.factory/settings.json (local, not in repo): populated with customModels entries for GPT-5.5, GPT-5.4, GPT-5.4-Mini, GPT-5.3-Codex all pointing at the OAuth proxy (http://127.0.0.1:10531/v1).
• src/model-resolution.ts: droid added to BARE_MODEL_HARNESSES; alias mappings added for cc-opus→gpt-5.5, cc-sonnet→gpt-5.4, cc-haiku→gpt-5.4-mini, pi-coder→gpt-5.3-codex, pi-deep→gpt-5.5.
• ~/.flt/presets.json (local, not in repo): droid-coder, droid-deep, droid-mini, droid-reviewer presets added.
• All 28 model-resolution unit tests pass.

How it works

1. droid reads ~/.factory/settings.json and assigns each customModels entry an id custom:{model_slug}-0
2. flt writes a per-session settings file with model: "custom:gpt-5.4-0" (via toCustomModelId)
3. droid sees the custom: prefix → BYO mode → uses the entry's baseUrl (http://127.0.0.1:10531/v1) and apiKey: "unused" → OAuth proxy → ChatGPT Codex backend

Test plan

• Start codex-oauth proxy (codex-oauth start or equivalent)
• flt spawn droid-coder in a worktree — confirm droid opens with GPT-5.4 and responds without subscription error
• flt spawn droid-deep — confirm GPT-5.5 works
• flt spawn droid-mini — confirm GPT-5.4-mini works
• Alias: flt spawn --cli droid --model cc-sonnet → resolves to gpt-5.4 → custom:gpt-5.4-0

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 48092655-f788-44d2-acd6-fe9906f810cd

📥 Commits

Reviewing files that changed from the base of the PR and between 5218c18 and 933199a.

📒 Files selected for processing (3)

• src/adapters/droid.ts
• src/model-resolution.ts
• tests/unit/model-resolution.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch flt/droid-oauth-fixer

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