Changelog

Unreleased

Nothing is locked. Every lesson opens at any time from the lesson list, every skill can be picked in Drills and Sprint, and the stats bars show “new” instead of “locked”. Prerequisites are now recommendations: the list marks the suggested next lesson (“next”), Home’s Continue opens it, and a lesson whose prerequisites are not yet at 0.80 shows a small “Builds on: …” line with a link to each of them. The note appears once per lesson and never blocks.
The session planner chooses from skills on the suggested path plus every skill already practised or marked known, in any order. A focus skill with a weak prerequisite still runs; when no review is due, the warm-up becomes a light review of that prerequisite (5 untimed items).

“I know this already” at the top of every lesson. It marks the skill as known, sets its knowledge estimate to 0.80 (the threshold, not 1.0, and never lower than an estimate already earned) and moves on to the suggested next lesson. Known skills are mixed into focus drills and cool-downs.
“Reset this skill” on a lesson marked known, and Settings > Data > Reset one skill for any skill. A skill with real practice asks for a second tap. History is kept.
Capture screen lesson-gap (lesson S11 opened ahead of its prerequisite) for ABAX_SHOT; the demo profile marks A1 as known.

Two additive fields: marked_known on each skill and builds_on_noted at the top level. 0.2 profiles load unchanged; the format version stays 1, so 0.2.x can still open a 0.3.0 profile.
Android versionCode 300.

macOS: the app opened as “Abax is damaged and can’t be opened”. make-app.sh now ad-hoc signs the finished Abax.app (codesign --force --deep --sign -), the release job signs the dmg too, and the job fails unless codesign --verify --deep --strict passes on the .app and on the copy inside the dmg. The app is still not notarized: the first launch needs right-click > Open (macOS 15 and later: Privacy & Security > Open Anyway) or xattr -cr /Applications/Abax.app. See docs/macos-gatekeeper.md.
Android versionCode 201.

The soroban is drawn by one wgpu paint callback: one pipeline, one instanced draw, shaded per pixel in WGSL. Beads are solids of revolution with a key light, specular highlight, rim darkening, contact occlusion and soft shadows; rods are shaded cylinders; the beam is bevelled lacquer with inset unit dots; the frame is grained, bevelled wood around a vignetted well.
Three finishes under Settings > Appearance, each tuned for light and dark: Walnut (bone beads, bamboo rods, the default), Ebony (bone beads, brass rods and beam) and Maple (slate beads, steel rods). Saves from 0.1.0 load as Walnut.
The anzan fade turns beads to glass: the body goes first, the highlights last.
The previous egui painter remains as a fallback when wgpu is unavailable.

Hints: a stronger vermilion halo and an outlined arrow with a shaft.
Bead moves settle on a critically damped spring; beads you move brighten briefly.
Flash anzan shows large numerals; the home screen carries a small live soroban.
Shared header, card, section and button styles across all screens.

A manual (mdBook) and a landing page with downloads for the latest release, published on GitHub Pages at https://zahakj.github.io/abax/.
New captures of every screen in light and dark, the three finishes, and a looping hero clip.
Screenshot mode can record a frame sequence (ABAX_SHOT=<screen>:<dir>/) and has glass and flash-run targets.
Contributing guide, code of conduct, security policy, issue and pull request templates.

The Android build pins build-tools 35.0.0 and platform 35 (ABAX_BUILD_TOOLS, ABAX_PLATFORM).
Release notes are this file’s section for the tag.
The APK carries the workspace version: 0.2.0 is versionCode 200 and installs over 0.1.0 (versionCode 1).
A Pages workflow builds the site with a pinned mdBook 0.5.4.

First release.

Soroban model and bead-move engine with every five- and ten-complement rule, carry and borrow, and Kojima’s finger-order rules; multiplication and division as step sequences.
Curriculum of 15 skills (S0-S11, A1-A3) with lessons (explanation, demonstration, guided practice), drills (set, read, chains, multiplication, division, mixed, 60 s sprint), anzan with fading beads and flash anzan.
Adaptive scheduler: Bayesian Knowledge Tracing per skill, accuracy and speed EWMAs, Elo-style item difficulty, mastery gate, session planner (warm-up, focus, cool-down), 14-day momentum instead of streaks.
egui/eframe app on wgpu: interactive soroban (tap, drag, keyboard), on-screen keypad, light and dark themes, stats charts, settings, synthesised bead click on desktop.
Versioned JSON profile written atomically.
Binaries for Linux, Windows and macOS; Android APKs (arm64 and universal) built without Gradle.