refactor: apply minimal tfcode branding

- Rename packages/opencode → packages/tfcode (directory only)
- Rename bin/opencode → bin/tfcode (CLI binary)
- Rename .opencode → .tfcode (config directory)
- Update package.json name and bin field
- Update config directory path references (.tfcode)
- Keep internal code references as 'opencode' for easy upstream sync
- Keep @opencode-ai/* workspace package names

This minimal branding approach allows clean merges from upstream
opencode repository while providing tfcode branding for users.

packages/tfcode/src/question/index.ts

@@ -0,0 +1,221 @@
+import { Deferred, Effect, Layer, Schema, ServiceMap } from "effect"
+import { Bus } from "@/bus"
+import { BusEvent } from "@/bus/bus-event"
+import { InstanceState } from "@/effect/instance-state"
+import { makeRunPromise } from "@/effect/run-service"
+import { SessionID, MessageID } from "@/session/schema"
+import { Log } from "@/util/log"
+import z from "zod"
+import { QuestionID } from "./schema"
+
+export namespace Question {
+  const log = Log.create({ service: "question" })
+
+  // Schemas
+
+  export const Option = z
+    .object({
+      label: z.string().describe("Display text (1-5 words, concise)"),
+      description: z.string().describe("Explanation of choice"),
+    })
+    .meta({ ref: "QuestionOption" })
+  export type Option = z.infer<typeof Option>
+
+  export const Info = z
+    .object({
+      question: z.string().describe("Complete question"),
+      header: z.string().describe("Very short label (max 30 chars)"),
+      options: z.array(Option).describe("Available choices"),
+      multiple: z.boolean().optional().describe("Allow selecting multiple choices"),
+      custom: z.boolean().optional().describe("Allow typing a custom answer (default: true)"),
+    })
+    .meta({ ref: "QuestionInfo" })
+  export type Info = z.infer<typeof Info>
+
+  export const Request = z
+    .object({
+      id: QuestionID.zod,
+      sessionID: SessionID.zod,
+      questions: z.array(Info).describe("Questions to ask"),
+      tool: z
+        .object({
+          messageID: MessageID.zod,
+          callID: z.string(),
+        })
+        .optional(),
+    })
+    .meta({ ref: "QuestionRequest" })
+  export type Request = z.infer<typeof Request>
+
+  export const Answer = z.array(z.string()).meta({ ref: "QuestionAnswer" })
+  export type Answer = z.infer<typeof Answer>
+
+  export const Reply = z.object({
+    answers: z
+      .array(Answer)
+      .describe("User answers in order of questions (each answer is an array of selected labels)"),
+  })
+  export type Reply = z.infer<typeof Reply>
+
+  export const Event = {
+    Asked: BusEvent.define("question.asked", Request),
+    Replied: BusEvent.define(
+      "question.replied",
+      z.object({
+        sessionID: SessionID.zod,
+        requestID: QuestionID.zod,
+        answers: z.array(Answer),
+      }),
+    ),
+    Rejected: BusEvent.define(
+      "question.rejected",
+      z.object({
+        sessionID: SessionID.zod,
+        requestID: QuestionID.zod,
+      }),
+    ),
+  }
+
+  export class RejectedError extends Schema.TaggedErrorClass<RejectedError>()("QuestionRejectedError", {}) {
+    override get message() {
+      return "The user dismissed this question"
+    }
+  }
+
+  interface PendingEntry {
+    info: Request
+    deferred: Deferred.Deferred<Answer[], RejectedError>
+  }
+
+  interface State {
+    pending: Map<QuestionID, PendingEntry>
+  }
+
+  // Service
+
+  export interface Interface {
+    readonly ask: (input: {
+      sessionID: SessionID
+      questions: Info[]
+      tool?: { messageID: MessageID; callID: string }
+    }) => Effect.Effect<Answer[], RejectedError>
+    readonly reply: (input: { requestID: QuestionID; answers: Answer[] }) => Effect.Effect<void>
+    readonly reject: (requestID: QuestionID) => Effect.Effect<void>
+    readonly list: () => Effect.Effect<Request[]>
+  }
+
+  export class Service extends ServiceMap.Service<Service, Interface>()("@opencode/Question") {}
+
+  export const layer = Layer.effect(
+    Service,
+    Effect.gen(function* () {
+      const state = yield* InstanceState.make<State>(
+        Effect.fn("Question.state")(function* () {
+          const state = {
+            pending: new Map<QuestionID, PendingEntry>(),
+          }
+
+          yield* Effect.addFinalizer(() =>
+            Effect.gen(function* () {
+              for (const item of state.pending.values()) {
+                yield* Deferred.fail(item.deferred, new RejectedError())
+              }
+              state.pending.clear()
+            }),
+          )
+
+          return state
+        }),
+      )
+
+      const ask = Effect.fn("Question.ask")(function* (input: {
+        sessionID: SessionID
+        questions: Info[]
+        tool?: { messageID: MessageID; callID: string }
+      }) {
+        const pending = (yield* InstanceState.get(state)).pending
+        const id = QuestionID.ascending()
+        log.info("asking", { id, questions: input.questions.length })
+
+        const deferred = yield* Deferred.make<Answer[], RejectedError>()
+        const info: Request = {
+          id,
+          sessionID: input.sessionID,
+          questions: input.questions,
+          tool: input.tool,
+        }
+        pending.set(id, { info, deferred })
+        Bus.publish(Event.Asked, info)
+
+        return yield* Effect.ensuring(
+          Deferred.await(deferred),
+          Effect.sync(() => {
+            pending.delete(id)
+          }),
+        )
+      })
+
+      const reply = Effect.fn("Question.reply")(function* (input: { requestID: QuestionID; answers: Answer[] }) {
+        const pending = (yield* InstanceState.get(state)).pending
+        const existing = pending.get(input.requestID)
+        if (!existing) {
+          log.warn("reply for unknown request", { requestID: input.requestID })
+          return
+        }
+        pending.delete(input.requestID)
+        log.info("replied", { requestID: input.requestID, answers: input.answers })
+        Bus.publish(Event.Replied, {
+          sessionID: existing.info.sessionID,
+          requestID: existing.info.id,
+          answers: input.answers,
+        })
+        yield* Deferred.succeed(existing.deferred, input.answers)
+      })
+
+      const reject = Effect.fn("Question.reject")(function* (requestID: QuestionID) {
+        const pending = (yield* InstanceState.get(state)).pending
+        const existing = pending.get(requestID)
+        if (!existing) {
+          log.warn("reject for unknown request", { requestID })
+          return
+        }
+        pending.delete(requestID)
+        log.info("rejected", { requestID })
+        Bus.publish(Event.Rejected, {
+          sessionID: existing.info.sessionID,
+          requestID: existing.info.id,
+        })
+        yield* Deferred.fail(existing.deferred, new RejectedError())
+      })
+
+      const list = Effect.fn("Question.list")(function* () {
+        const pending = (yield* InstanceState.get(state)).pending
+        return Array.from(pending.values(), (x) => x.info)
+      })
+
+      return Service.of({ ask, reply, reject, list })
+    }),
+  )
+
+  const runPromise = makeRunPromise(Service, layer)
+
+  export async function ask(input: {
+    sessionID: SessionID
+    questions: Info[]
+    tool?: { messageID: MessageID; callID: string }
+  }): Promise<Answer[]> {
+    return runPromise((s) => s.ask(input))
+  }
+
+  export async function reply(input: { requestID: QuestionID; answers: Answer[] }) {
+    return runPromise((s) => s.reply(input))
+  }
+
+  export async function reject(requestID: QuestionID) {
+    return runPromise((s) => s.reject(requestID))
+  }
+
+  export async function list() {
+    return runPromise((s) => s.list())
+  }
+}

packages/tfcode/src/question/schema.ts

@@ -0,0 +1,17 @@
+import { Schema } from "effect"
+import z from "zod"
+
+import { Identifier } from "@/id/id"
+import { Newtype } from "@/util/schema"
+
+export class QuestionID extends Newtype<QuestionID>()("QuestionID", Schema.String) {
+  static make(id: string): QuestionID {
+    return this.makeUnsafe(id)
+  }
+
+  static ascending(id?: string): QuestionID {
+    return this.makeUnsafe(Identifier.ascending("question", id))
+  }
+
+  static readonly zod = Identifier.schema("question") as unknown as z.ZodType<QuestionID>
+}