sidequest-lab.dev[One sentence about the blog: what you write here and why you also record the mistakes.]https://sidequest-lab.dev/en-USTinstar: the rules in AGENTS.md, turned into checks that run without an LLMhttps://sidequest-lab.dev/blog/tinstar/https://sidequest-lab.dev/blog/tinstar/AGENTS.md tells an AI agent the rules, but nothing checks they were followed, and every rule costs tokens in every conversation. Tinstar compiles each rule once into a small check that runs in the terminal, the editor, CI and the agent loop. How the laws are drafted, why each one is tested before anyone sees it, and the noise check that caught a law firing 15,000 times.Fri, 06 Nov 2026 00:00:00 GMTWINbackendrustai-agentslspmcpstatic-analysisA car in C++ with an engine, clutch and gearbox: the start of a parking simulatorhttps://sidequest-lab.dev/blog/car-simulator-cpp/https://sidequest-lab.dev/blog/car-simulator-cpp/How I built a car's physics in C++23 with raylib, commit by commit: the chain from pedal to wheel, a clutch that slips, Pacejka tires, load transfer and the two bugs the screenshots revealed.Thu, 05 Nov 2026 00:00:00 GMTWINgamescppphysicsraylibsimulationgamesA phone that obeys the Mac but never traps you: Foco and Foco Guardhttps://sidequest-lab.dev/blog/foco-mac-e-foco-guard/https://sidequest-lab.dev/blog/foco-mac-e-foco-guard/A Mac app for focus sessions and an Android app that blocks distractions without root. How they talk through a signed local protocol, why unlocking never depends on the Mac, and what I did when the blocking engine could not be trusted.Wed, 04 Nov 2026 00:00:00 GMTWINmobileswiftkotlinandroidprotocolsecuritySaint Seiya: The Hades port, one week on: faster fights, a crash that was not what I thoughthttps://sidequest-lab.dev/blog/saint-seiya-semana-de-ajustes/https://sidequest-lab.dev/blog/saint-seiya-semana-de-ajustes/What changed in the native port after widescreen: VU1 programs compiled ahead of time, 15,000 draws merged into 500, the rare crash that was an interrupt stack in the wrong place, SPU2 reverb, the opening video and a training mode.Tue, 03 Nov 2026 00:00:00 GMTWINgamesps2recompilationperformancedebuggingaudioSimulator and relay: what I learned testing hardware that isn't on the benchhttps://sidequest-lab.dev/blog/simulador-e-relay-de-telemetria/https://sidequest-lab.dev/blog/simulador-e-relay-de-telemetria/What it was like to build simulators and relays to validate embedded systems without relying on physical equipment, and what that experience taught me about protocols, testing and compatibility.Thu, 22 Oct 2026 00:00:00 GMTWINembeddedcareerembeddedsimulationtestingprotocolscompatibilitySaint Seiya: The Hades in 16:9 without stretching anythinghttps://sidequest-lab.dev/blog/saint-seiya-widescreen/https://sidequest-lab.dev/blog/saint-seiya-widescreen/How I added real widescreen to the native port of a PS2 game: finding the camera in the MIPS code, widening the field of view, keeping the HUD and menus in 4:3 and filling full-screen artwork.Wed, 21 Oct 2026 00:00:00 GMTWINgamesps2recompilationreverse-engineeringwidescreenvulkanBlack Site: one day of building my own Vulkan enginehttps://sidequest-lab.dev/blog/black-site-vulkan-um-dia/https://sidequest-lab.dev/blog/black-site-vulkan-um-dia/What Black Site is, the game I am building in C++ with Vulkan, and everything that came together in a single day: materials, shadows, ECS, physics, JSON scenes, UI and a character that walks.Mon, 19 Oct 2026 00:00:00 GMTWINgamesvulkanc++game-enginejoltecsAbout me: from a freezing netbook to low-level systemshttps://sidequest-lab.dev/blog/sobre-mim/https://sidequest-lab.dev/blog/sobre-mim/How I went from graphic design to leading cloud migrations, coding in C++, and exploring game engines.Sat, 17 Oct 2026 00:00:00 GMTLIFEallcareersystemsc++aws