Devlog: Phase 30 to now

Phase 30, Instrument frontend. Redesigned the UI to read like a physics instrument. Bundled the fonts, dropped four fields nothing actually measured, and learned that text-transform: uppercase turns 3d into 3D and α² into A², so uppercase is now confined to section headings only.

Phase 31, Guided tours. Added walkthroughs that drive the app for you. Nearly shipped a tour that quoted the wrong hydrogen energy because it skipped reduced mass, and fixed two spotlight rings that measured their target before layout settled.

Absorption band cleanup. Abutting sub-pixel SVG rects were drawing lines that weren’t in the data. Settled the mean vs deepest-per-column question and fixed decade ticks that failed at both ends of the axis.

Housekeeping. Moved specs and plans out to docs/specs and docs/plans. Personal ignores went into .git/info/exclude so no tracked file carries tooling names.

Rate limiting. Sized the burst from the app’s real fan-out per action rather than from click counts. The n=6 row plus an auto-refetch was quietly doubling the load.

Web hosting. Containerized and deployed to Fly.io as a single process. Cold start from a snapshot is about 1.6s, occasionally up to 22s if the snapshot gets discarded. Argon solves in 2.8s on the deployed box against 1.4s locally. Suspended machines cost nothing, so occasional use stays near a dollar or two a month.

Also added rate-limiter logging that identifies refused clients, and confirmed the proxy overwrites forged IP headers, so spoofing doesn’t get you past the limit.