The Guardian-ARM sentinel judder, run to ground five times

What was wrong before this entry, in five layers that each hid the next. First: the page-wide animation engine painted every scene only on its 33-millisecond step boundaries — about 30 frames per second. The old flat lattice moved slowly enough to hide that; the sentinel redesign moved fast enough to expose it, and the stepping read as frame-to-frame jumping. The engine gained a smooth lane: a consumer that declares itself smooth is repainted on every display tick between steps, interpolating with the fractional phase the engine's clock already published for exactly this purpose. State still advances only on integer steps, so determinism and the loop-exactness guarantee are untouched.

Second: with the spine gliding, the wave-field skin still updated only per engine step and micro-popped at each boundary. The kernel now retains the previous step's weights and the draw interpolates between the two.

Third: the mesh issued one beginPath/stroke call per grid segment — roughly 7,600 canvas calls per paint, now at display rate. Tartarus Cloud's scenes were already governed by the frontier performance pattern — precompute geometry once, batch the draw calls, allocate nothing per frame — and the mesh now follows it: all segments of one colour in one path with one stroke, six strokes per frame instead of ~7,600. A prior ruling had refused path-merging to preserve double-blended joint translucency; the fluidity order overturns it, and the alphas were raised one step to repay the single blend.

Fourth, and the deepest: two discrete events lived in the simulation itself. The attack channel re-computed its threshold on every step, so every 33 milliseconds a fresh set of nodes hard-flipped between defense cyan and attack orange with a dot-size pop — dozens of discrete visual events per step, strobing the whole body. An intrusion now ramps in through a smoothing filter and the drawn state flips only through a hysteresis band: rare, deliberate, readable events, the way a real detection presents. And the raw wave field is floored noise pushed through a modulo — when the sum crosses the modulus the field teleports full-scale, and one smoothing pole left a visible twitch. A second pole removes it while keeping the field's motion character. The governor-driven mid-motion canvas resize was pinned away in the same pass.

The same campaign gave the sentinel its cinematography: form and camera run a 48-second super-loop — wide, a push-in to a close-up that tracks along the calibrating lattice skin, and a pull back that lands exactly where the loop began, continuous across the wrap by construction.