Foundation

M1’s job was the skeleton: a deployed no-scroll shell with agents wandering behind the hero, gated by CI. Three decisions did the heavy lifting.

View transitions over an SPA. The shell’s slides could have been client-side routing; instead every panel is a real Astro page joined by <ClientRouter /> (b9e6089). The trade-off bought the safety net the PRD demands (FR-74): with JavaScript off, the site is ordinary readable pages. The slide is presentation, never load-bearing.

Pure maths under the canvas. The agent island (9e8830a) split into behaviours — pure functions over plain data with an injected seeded RNG — and an engine owning the canvas and clock. That split is why the steering maths could be unit-tested in isolation (ea11e45): jitter bounds, speed clamps, edge wrap, and bit-identical trajectories from SEED=42. The readout above the agents obeys the same honesty rule as the content: count, behaviour, and fps are measured live, and an unmeasured fps renders as an em-dash.

Review as adversary, not formality. A multi-agent review pass over the finished milestone confirmed eighteen findings (420834e). The two that stung: Astro’s router silently killed the reduced-motion fade with an !important it injects itself, and the signal teal failed WCAG AA as text on light backgrounds — fixed with a dedicated --signal-text token. The sharpest catch came from mutation testing: the original clamp tests could not fail, because from cruise speed the clamps never bind. Deleting the clamps left the suite green. Two tests now start an agent past the speed limit and assert the clamp binds exactly.

The milestone closed with the stack itself moving under us: the PRD adopted Astro 6, recorded as ADR 0006 superseding the Astro 5 decision (3f93647 seeded that log) — the first real use of the supersede-never-edit rule. Workflow throughout: Phil directs and reviews, Claude architects, Claude Code builds — and the commits above are the receipts.