feat(uno-q): resident-responder fast-path for the LED matrix (instant, no flash)

The agent now drives the matrix in <1s via the resident responder instead of
compiling+flashing a sketch (~95s). Pieces:

- matrix-relay/: a tiny container (python-apps-base) running relay.py — a
  TCP:9999 → RouterBridge relay. The ZeroClaw daemon runs on the host for
  hardware access, but the RouterBridge python binding (arduino.app_utils)
  only ships in the App Lab image, so JUST the relay runs containerized,
  mounting the router socket + publishing :9999 to loopback.
- config.template.toml: add matrix_pattern + matrix_text to the default risk
  profile's allowed_tools/auto_approve (the capability filter hides tools not
  listed — this was why matrix_text wasn't exposed to the agent).
- skills/led-matrix: lead with "use matrix_text / matrix_pattern first"; only
  flash for custom frames (flashing overwrites the responder). NOTE skills load
  from each agent's workspace copy, not shared/skills — push to all workspaces.
- provision-host-daemon.sh: flash the responder once + start the relay.

Proven on-hardware: "show a heart" and "scroll GO CLAWS" both instant via the
agent, no flash.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

deploy/uno-q/skills/led-matrix/SKILL.md

@@ -8,6 +8,24 @@ description: Drive the Arduino Uno Q's built-in 13x8 blue LED matrix — draw fr
 The Uno Q has a built-in **13 columns × 8 rows** (104-pixel) **blue** LED matrix,
 driven by the STM32U585 MCU. (It is NOT an LCD, and NOT red.)
 
+## Instant runtime control — USE THIS FIRST (no flashing)
+
+The board runs a **resident responder sketch** that already drives the matrix, so
+you can change what it shows **instantly** with these tools — no sketch, no
+compile, no flash:
+
+- **`matrix_text`** — scroll a short message. Use for ANY "scroll / show / display
+  / print `<text>`" request (e.g. `text="GO CLAWS"`).
+- **`matrix_pattern`** — switch to a preset animation: `off, rain, heart, wave,
+  sparkle, checker, solid, blink`.
+
+**Always reach for these tools first** for text or a preset animation. They take
+effect in under a second. Do **NOT** write and flash a sketch for these — flashing
+takes ~90s **and overwrites the resident responder, breaking `matrix_text` /
+`matrix_pattern` until it's re-flashed.** Only write + flash a sketch (below) for a
+**custom** frame pattern the tools can't produce, and know it replaces the
+responder.
+
 ## Prefer the frame API (always available)
 
 `Arduino_LED_Matrix` is bundled with the `arduino:zephyr` core — **no lib install**.