chore: add v0.2.1 changelog, fix README purpose, remove duplicate USER_MANUAL

TODO.org

@@ -223,10 +223,41 @@ The Dispatcher's role has evolved beyond security guard. It is the seed of the d
     - Implement lazy-loading: edits mark nodes as =:vector :pending=
     - Background worker thread batches pending nodes and updates Merkle tree silently
 
-** TODO 6. Slash Commands (TUI ergonomics)
-*** TODO M-x style command palette
-*** TODO /- prefix for command mode
-*** TODO Commands defined in Org-mode
+** TODO 6. TUI Experience (Daily Driver Quality)
+Architectural note: The TUI is a standalone Croatoan app in ~org/gateway-tui.org~.
+None of these changes require daemon modifications — the protocol between TUI and
+daemon (port 9105, framed plists) is stable. A tmux session provides a virtual
+terminal for REPL-based TUI testing: ~tmux send-keys~ / ~tmux capture-pane~.
+
+*** TODO P0: Chat scrollback (Page Up/Down)
+    Track rendered history beyond the window height; Page Up/Down scrolls through it. ~2h.
+
+*** TODO P0: Input history (up/down arrows)
+    Maintain a ring buffer of sent messages; up arrow recalls previous, down advances. ~1h.
+
+*** TODO P1: Status bar (bottom line)
+    Shows daemon connection status, active LLM model, current time. Separator line
+    between input area and status. ~3h.
+
+*** TODO P1: Message rendering
+    Timestamps (HH:MM), styled prefixes (⬆ sent vs ⬇ received in different colors),
+    line wrapping for long messages. ~2h.
+
+*** TODO P2: Command palette (/help redesign)
+    /help shows a scrollable popup overlay with categories: chat, system, skills, debug.
+    Absorbs the old /-prefix command mode item. ~4h.
+
+*** TODO P2: Multi-line input (Shift+Enter for newline)
+    Detect Shift+Enter vs plain Enter; expand input window for long messages. ~3h.
+
+*** TODO P3: Background activity indicator
+    Spinner or dots when the agent is processing; reads from daemon heartbeats. ~2h.
+
+*** TODO P4: Tab completion for / commands
+    Tab after / completes command name. ~3h.
+
+*** TODO P4: Configurable theme
+    Color scheme variables in the TUI package; basic /theme command. ~4h.
 
 * PHASE: LONG-HORIZON PLANNING + GIT WORKFLOWS (v0.4.0)
 :PROPERTIES: