Skeleton

src/app/mod.rs

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+

src/core/mod.rs

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+pub mod types;

src/core/types.rs

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+// Types are scaffolding — used in later phases.
+#![allow(dead_code)]
+
+/// A streaming event emitted by the model provider.
+#[derive(Debug)]
+pub enum StreamEvent {
+    /// A text chunk from the assistant's response.
+    TextDelta(String),
+    /// Number of input tokens used in this request.
+    InputTokens(u32),
+    /// Number of output tokens generated so far.
+    OutputTokens(u32),
+    /// The stream has completed successfully.
+    Done,
+    /// An error occurred during streaming.
+    Error(String),
+}
+
+/// An action sent from the TUI to the core orchestrator.
+#[derive(Debug)]
+pub enum UserAction {
+    /// The user has submitted a message.
+    SendMessage(String),
+    /// The user has requested to quit.
+    Quit,
+}
+
+/// An event sent from the core orchestrator to the TUI.
+#[derive(Debug)]
+pub enum UIEvent {
+    /// A text chunk to append to the current assistant message.
+    StreamDelta(String),
+    /// The current assistant turn has completed.
+    TurnComplete,
+    /// An error to display to the user.
+    Error(String),
+}
+
+/// The role of a participant in a conversation.
+#[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum Role {
+    /// A message from the human user.
+    User,
+    /// A message from the AI assistant.
+    Assistant,
+}
+
+/// A single message in the conversation history.
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct ConversationMessage {
+    /// The role of the message author.
+    pub role: Role,
+    /// The text content of the message.
+    pub content: String,
+}

src/main.rs

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+mod app;
+mod core;
+mod provider;
+mod tui;
+
+fn main() {}

src/provider/mod.rs

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+

src/tui/mod.rs

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+