Fold wiki DI/factory lesson content into core-programming patterns

[aschokking]

Follow-up to #14. The curriculum sequence now sends students from Command Groups into these two pages instead of duplicating the wiki's Factories / Power of Injection / DI with Dagger lessons — so these pages need to actually cover what those lessons taught. They didn't.

dependency-injection.md

The missing half: simulation and mocks. The page explained Component, Module and @Inject, but never mentioned SimulationComponent or MockDevicesModule — which is the whole reason DI matters to a student whose unit tests run on a laptop with no robot. New "Real hardware vs. mocks" section covers:

• RobotComponent (real devices) vs SimulationComponent (mock devices), both extending BaseRobotComponent
• Robot.createDaggerComponent() choosing between them via BaseRobot.isReal()
• the MockDevicesModule @Binds that swaps XCANMotorControllerFactory for the mock implementation
• the payoff: DriveSubsystem asks for a factory and never learns which kind it got, so there is no if (testMode) anywhere in subsystem code

How tests reach into Dagger. Adds the getInjectorComponent().tankDriveWithJoysticksCommand() pattern students see in TankDriveTest, and explains why BaseRobotComponent needs one abstract method per directly-requestable type — while most classes need nothing, since an @Inject constructor is enough.

Smaller fixes: names constructor injection, and fixes public class ShooterSubsystem() { — a class declaration can't take parentheses, so that sample wouldn't compile. (Same bug the wiki version had; fixed there earlier.)

providers-factories.md

A gentler way in. The page opened with "Dagger can inject dependencies, but what if you need objects with runtime values?" — reasonable for someone who already knows Dagger, steep for someone arriving straight from Command Groups. New "What's a Factory?" opener uses the wiki's Car/CarFactory analogy, then connects it to code the student has already written:

this.frontLeft = motorControllerFactory
        .create(new CANMotorControllerInfo("FrontLeft", 1), this.getPrefix(), "FrontLeft");

The existing Dagger-level material follows unchanged.

Also: adds XGyro.XGyroFactory and XSolenoid.XSolenoidFactory to the factory table.

Verification

• Every class and factory name checked against current SeriouslyCommonLib / XbotEdu sources. The eight factories already in the table all exist; the two added do too.
• pnpm docs:build passes.

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