docs(README, roadmap): update for shipped TUI features

- README: add TUI to "What works today", remove stale "Next up:
  terminal UI" since TUI is shipped.
- Roadmap: mention stable-prefix cache in markdown rendering bullet,
  add truncated output body to tool call display description.

Author: hakula139

README.md

@@ -15,13 +15,14 @@ oxide-code is a Rust reimplementation of Claude Code — an interactive CLI agen
 
 Early development. What works today:
 
+- Terminal UI with markdown rendering, syntax-highlighted code blocks, and streaming display
 - Agent loop with streaming and extended thinking
 - File and search tools (read, write, edit, glob, grep, bash)
 - System prompt with CLAUDE.md / AGENTS.md injection
 - Authentication (API key and Claude Code OAuth)
 - TOML config file with layered loading
 
-Next up: terminal UI. See [`docs/roadmap.md`](docs/roadmap.md) for details.
+See [`docs/roadmap.md`](docs/roadmap.md) for current focus and plans.
 
 ## Usage
 

docs/roadmap.md

@@ -43,8 +43,8 @@ The project direction is simple:
 - `AgentSink` trait decouples the agent loop from display — same code drives TUI (`ChannelSink`), bare REPL (`--no-tui`, `StdioSink`), and headless mode (`-p`).
 - Component architecture: `ChatView` (scrollable message list), `InputArea` (multi-line textarea), `StatusBar` (model + spinner + status + cwd).
 - Catppuccin Mocha theme with transparent background. Extensible `Theme` struct with role-specific style helpers (text, tool borders, thinking, semantic accents).
-- Markdown rendering for assistant messages via pulldown-cmark + syntect, with streaming-aware line-based commit boundary for partial render during streaming.
-- Tool call display with per-tool icons (`$ → ← ✎ ✱ ⌕`), styled left borders, and success / error result indicators.
+- Markdown rendering for assistant messages via pulldown-cmark + syntect, with streaming-aware line-based commit boundary and stable-prefix cache for O(new lines) per-token cost.
+- Tool call display with per-tool icons (`$ → ← ✎ ✱ ⌕`), styled left borders, success / error result indicators, and truncated output body (5 lines with overflow count).
 - Extended thinking display — dimmed italic block, respects `show_thinking` config, clears on stream start.
 - Multi-line input with `ratatui-textarea`: dynamic height (1–6 lines), Shift+Enter for newline, placeholder text.
 - Braille spinner animation (~80 ms per frame) during streaming and tool execution.