WIP: Add Droid SDK provider

[0xSero]

Intention

Draft/WIP implementation for adding Droid as a first-class T3 Code provider using Factory's TypeScript SDK: https://github.com/Factory-AI/droid-sdk-typescript

This PR contains the actual provider runtime path, kept behind Droid's disabled-by-default settings while we continue validating real Droid sessions and payloads.

Implemented

• Adds droid to shared provider/model/settings contracts.
• Registers a managed Droid provider driver and provider inventory probe.
• Wraps createSession / resumeSession from @factory/droid-sdk in a T3 provider adapter.
• Starts/resumes/stops Droid sessions, interrupts active turns, and supports in-session model/reasoning setting updates.
• Streams Droid assistant/reasoning text, tool use/progress/result, session state, token usage, title updates, MCP status/auth events, turn completion, and runtime errors into canonical T3 runtime events.
• Routes Droid permission callbacks through T3 Code approval requests instead of auto-approving.
• Routes Droid ask-user callbacks through the existing structured user-input flow.
• Sends supported image attachments (gif, jpeg, png, webp) as base64 SDK image sources resolved from T3's attachment store.
• Discovers Droid's SDK-reported models from createSession().initResult.availableModels, including user/custom models.
• Preserves custom Droid model IDs so multiple user models backed by the same underlying model are all selectable.
• Uses a temp cwd for the short-lived SDK discovery probe so model loading does not scan the current repo.
• Adds focused mocked-SDK adapter/provider tests for stream mapping, SDK options, permission approval routing, rollback/read failures, and SDK model mapping.
• Adds Droid UI presence in the model picker and Provider Settings with a WIP badge.
• Replaces the Droid icon with the provided favicon path.

Security / safety notes

• Droid remains disabled by default.
• The PR is draft/WIP until validated against more real Droid permission, file, MCP, and auth flows.
• No SDK secrets, pairing tokens, or provider auth payloads are intentionally logged by this implementation.
• Permission requests are mediated through T3 Code approval events and default to cancellation on missing/stale sessions.
• Attachment paths are resolved through the existing attachment store helper; unsupported MIME types fail before SDK submission.
• The Droid binary path is configurable but defaults to droid; prompt content is sent through the SDK rather than shell interpolation.
• Model discovery uses a short-lived SDK session and closes it immediately after reading init metadata.

Validation

• Real Droid CLI query: droid exec --model glm-5.1 --cwd /tmp ... returned droid-pong.
• Live SDK model discovery returned 67 models, including 38 user/custom models.
• Local T3 model picker showed custom Droid models such as HomeLab - GLM-5.1, HomeLab - Trinity-Large-Thinking, Direct - GPT-5.5-Fast-xHigh, and Direct - GPT-5.5-Low.
• Review comments addressed: missing-session reads now fail; Droid rollback now honors numTurns.
• bun fmt
• bun lint (passes with existing unrelated warnings)
• bun typecheck
• bun run test

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