tri-bot Phase 2: Streaming via sendMessageDraft + /stop

[gHashTag]

Overview

Add real-time streaming to tri-bot so Claude responses appear progressively in Telegram instead of waiting for the full response.

Requirements

Streaming (sendMessageDraft)

• Spawn claude -p with --output-format stream-json
• Set .stdout_behavior = .Pipe on std.process.Child
• Read NDJSON lines from stdout: type: "stream_event", event.delta.type: "text_delta"
• Accumulate text, call sendMessageDraft every 500ms
• Final sendMessage when Claude finishes

/stop command

• Track active std.process.Child in SharedState
• /stop sends SIGTERM to the child process
• Send confirmation: "⛔ Claude process stopped"

Two-thread architecture

• Main thread: Telegram polling (getUpdates → dispatch)
• Worker thread: Claude process + streaming
• Shared state via std.atomic.Value(bool) for is_busy

const SharedState = struct {
    active_child: ?*std.process.Child = null,
    is_busy: std.atomic.Value(bool) = std.atomic.Value(bool).init(false),
};

Files to modify

File	Change
NEW claude_stream.zig	Spawn + pipe + NDJSON parse + sendMessageDraft
MODIFY bot_loop.zig	std.Thread.spawn() for /ask, SharedState
MODIFY handlers.zig	/stop kills active_child

Acceptance criteria

• /ask shows progressive text in Telegram (streaming)
• /stop kills running Claude process
• Bot remains responsive during long Claude runs
• No race conditions in SharedState

Depends on: #54