feat: add McpScreen phase 2 display tools

Apps/McpScreen/README.md

@@ -2,7 +2,7 @@
 
 Native Tactility port of the MicroPython MCP Screen firmware.
 
-The current Phase 1 slice provides:
+Phase 1 provides:
 
 - JSON-RPC 2.0 over `POST /api/mcp` on port 80
 - `tools/list`
@@ -10,6 +10,16 @@ The current Phase 1 slice provides:
 - `clear_screen`
 - `draw_text`
 
+Phase 2 adds:
+
+- `draw_raw_rgb565`
+- `POST /api/screen/raw`
+- `draw_color_bmp`
+- bridge-assisted PBM `draw_image`
+- PBM `get_screenshot`
+
+Backlight and screen-power controls are intentionally excluded.
+
 See `IMPLEMENTATION_PLAN.md` for the full roadmap.
 
 UDP discovery is temporarily unavailable to an external app because the
@@ -17,9 +27,14 @@ Tactility 0.7.0-dev firmware does not export `lwip_recvfrom` and
 `lwip_sendto`. The existing MicroPython bridge remains compatible through its
 HTTP subnet-scan fallback.
 
-The HTTP worker uses a non-blocking listener and is explicitly stopped and
-deleted during `onDestroy`. This is required because Tactility unloads the
-external ELF after the app closes.
+The HTTP worker uses a non-blocking listener and short client timeouts.
+`onHide` signals it and returns immediately; the worker owns the socket
+shutdown and then suspends itself outside the GUI lifecycle. It is reaped by
+the next `onShow`, or by `onDestroy` before Tactility unloads the external ELF.
+
+The MCP server is foreground-only: it starts in `onShow`, and port 80 closes
+within one short worker poll after `onHide`. It is intentionally unavailable
+whenever McpScreen is not the active screen.
 
 ## Build
 
@@ -51,7 +66,7 @@ The existing MicroPython host bridge can also be used unchanged:
 python3 /Users/adolforeyna/Projects/MicroPython/test1/Screen/mcp_bridge.py
 ```
 
-Or run the included Phase 1 smoke test:
+Or run the included Phase 2 smoke test:
 
 ```bash
 python3 Apps/McpScreen/tools/smoke_test.py --ip DEVICE_IP --draw