Add RobotX 2026 documentation and update navigation

docs/robotx26.md

@@ -0,0 +1,87 @@
+# RobotX 2026
+
+The [Maritime RobotX Challenge](https://robotx.org/) is an international
+competition in which teams develop autonomous maritime systems that cooperate
+across the surface, air, and underwater domains. Unlike single-vehicle
+competitions, RobotX rewards teams that can coordinate heterogeneous robots —
+a surface vessel, an aerial scout, and an underwater vehicle — to complete
+tasks that no single platform could accomplish alone. Building on our 1st Place
+Autonomy finish at RobotX 2024, we are preparing for RobotX 2026 with a strong
+emphasis on multi-vehicle simulation before on-water testing.
+
+## Why Simulation First
+
+On-water testing time is scarce, expensive, and weather-dependent, and a fault
+in one vehicle can stall an entire multi-robot rehearsal. By reproducing the
+full three-vehicle system in simulation, we can iterate on mission logic and
+inter-vehicle coordination every day, reproduce failures deterministically, and
+arrive at the water with software that already works as an integrated system.
+The same perception, controls, and mission code we run in the simulator is what
+we intend to deploy on the real platforms, so progress made in simulation
+carries directly over to hardware.
+
+## Multi-Vehicle Simulation
+
+Our RobotX 2026 effort is built around a shared Gazebo simulation that runs an
+Autonomous Surface Vehicle (ASV), an Unmanned Aerial Vehicle (UAV), and an
+Autonomous Underwater Vehicle (AUV) together in one world — a model of the
+Singapore river competition course. All three vehicles are spawned into the
+same scene and connected to ROS 2, so they share a common clock, coordinate
+frames, and message bus exactly as they would on the water.
+
+The simulator and a set of end-to-end demos are public:
+
+- [`BumblebeeAS/multivehicle_sim`](https://github.com/BumblebeeAS/multivehicle_sim)
+  — the shared world, vehicle models, and the Gazebo ↔ ROS 2 bridges.
+- [`BumblebeeAS/examples`](https://github.com/BumblebeeAS/examples) — example
+  missions and controllers that run on top of the simulator (the
+  `multivehicle` project), launchable as a full stack with a single tmuxp
+  session.
+
+| Vehicle | Platform | Stack |
+|---------|----------|-------|
+| ASV | BlueBoat | thrust mixer + line-of-sight waypoint controller |
+| UAV | PX4 x500 | PX4 SITL + uXRCE-DDS offboard flight |
+| AUV | BlueROV2 | ArduSub / MAVROS missions |
+
+### Autonomous Surface Vehicle — BlueBoat
+
+The BlueBoat is the centerpiece of the RobotX course. Its control stack pairs a
+thrust mixer — which converts desired surge and yaw commands into individual
+thruster outputs — with a line-of-sight (LOS) waypoint controller that steers
+the vessel smoothly along a sequence of waypoints. A demo mission drives the
+boat through a course using this controller, exercising the same path-following
+logic we will use for the navigation and station-keeping tasks.
+
+### Unmanned Aerial Vehicle — PX4 x500
+
+The x500 quadrotor runs full PX4 software-in-the-loop, communicating over the
+uXRCE-DDS bridge just as the flight controller does on real hardware. An
+offboard flight demo commands autonomous trajectories from ROS 2, giving us a
+realistic testbed for an aerial scout that can survey the course and feed
+information back to the surface vehicle.
+
+### Autonomous Underwater Vehicle — BlueROV2
+
+The BlueROV2 runs ArduSub with MAVROS, mirroring the underwater platform's real
+autopilot interface. A scripted square-dive mission demonstrates depth-holding
+and waypoint navigation underwater, the foundation for the underwater elements of
+the challenge.
+
+## Tooling and Integration
+
+Running all three vehicles in one world lets us develop and debug the hand-offs
+between them — for example, the UAV scouting ahead of the ASV — rather than
+testing each platform in isolation. The same setup also validates the supporting
+infrastructure as an integrated system:
+
+- **Odometry bridges** publish each vehicle's pose into ROS 2, so missions and
+  visualization tools see a consistent picture of the whole fleet.
+- **An operations dashboard** tracks all three vehicles' odometry on a live web
+  view, simulating the shore-side situation we rely on at the
+  competition.
+- **Foxglove** provides real-time introspection of topics and transforms
+  during development and debugging.
+
+More details, results, and on-water footage will be added here as our RobotX
+2026 campaign progresses.

docs/stack.md

@@ -210,15 +210,19 @@ flowchart LR
 
 ## Simulation
 
-| Repository                                                  | What it does                                                 |
-| ----------------------------------------------------------- | ------------------------------------------------------------ |
-| [`ardusub_sim`](https://github.com/BumblebeeAS/ardusub_sim) | ArduSub and Gazebo simulation, built on Project DAVE.        |
-| [`bb_worlds`](https://github.com/BumblebeeAS/bb_worlds)     | Gazebo worlds and assets for vehicles and competition tasks. |
+| Repository                                                            | What it does                                                          |
+| --------------------------------------------------------------------- | -------------------------------------------------------------------- |
+| [`ardusub_sim`](https://github.com/BumblebeeAS/ardusub_sim)           | ArduSub and Gazebo simulation, built on Project DAVE.                |
+| [`bb_led_plugin`](https://github.com/BumblebeeAS/bb_led_plugin)       | Gazebo plugin simulating LEDs with runtime-switchable modes (patterns, colors). |
+| [`bb_worlds`](https://github.com/BumblebeeAS/bb_worlds)               | Gazebo worlds and assets for vehicles and competition tasks.         |
+| [`examples`](https://github.com/BumblebeeAS/examples)                 | End-to-end demos and quick-start workspaces built on our simulators. |
+| [`multivehicle_sim`](https://github.com/BumblebeeAS/multivehicle_sim) | Multi-vehicle Gazebo simulation running an ASV, UAV, and AUV together. |
 
 ## Developer Platforms and Tooling
 
 | Repository                                                                                        | What it does                                                   |
 | ------------------------------------------------------------------------------------------------- | -------------------------------------------------------------- |
+| [`bb_robotx_dashboard`](https://github.com/BumblebeeAS/bb_robotx_dashboard)                       | Web operations dashboard for tracking RobotX vehicles live.    |
 | [`controlkitv3`](https://github.com/BumblebeeAS/controlkitv3)                                     | Foxglove-based interface for vehicle control and telemetry.    |
 | [`isaac-ros-docker`](https://github.com/BumblebeeAS/isaac-ros-docker)                             | Docker tooling for Isaac ROS on legacy JetPack 6 Orin systems. |
 | [`release`](https://github.com/BumblebeeAS/release)                                               | Source for this documentation site and public release notes.   |

mkdocs.yml

@@ -111,3 +111,4 @@ nav:
   - Overview: index.md
   - Software Stack: stack.md
   - RoboSub 2025: robosub25.md
+  - RobotX 2026: robotx26.md