M5 begins. Renamed the test from "Finger Maze" to "Fine Motor Precision Test." Fixed a silent JavaScript failure (missing chart container ID). Improved placeholder text visibility across all tests. Removed a redundant HUD box from Fine Motor Precision. Replaced the "Fatigue Indicator" metric (which always showed +0%) with "Movement Control" — a metric measuring confident zone percentage.
The test was called "Finger Maze." AI suggested keeping the name — it was descriptive, recognizable, and users would understand it immediately. I renamed it to "Fine Motor Precision Test." Reason: names construct reality. "Finger Maze" describes the interface mechanic (navigating a maze with your finger). "Fine Motor Precision Test" describes what's being measured. For a platform whose purpose is measurement, the measurement name is the right name. The name change also changed how I thought about what the test should produce — it's not a maze score, it's a precision score.
Chart container bug: The results chart wasn't rendering in some browsers because the chart container div had an ID mismatch with the Chart.js initialization code. Silent failure — no error thrown, chart just didn't appear. Fixed by auditing all container IDs against all Chart.js initialization calls across all test files.
Recognized that the Fine Motor Precision Test is fundamentally different from the other tests. Reaction Time and Bilateral Coordination produce a stable metric: your reaction speed and bilateral symmetry don't change significantly between attempts within a session. Fine Motor Precision measures motor learning — performance improves with practice within a session, and degrades when the session ends. The results page needs to support showing improvement over time within a session, not just between sessions. This changes what "tracking over time" means for this specific test.
Names are design decisions. "Finger Maze" and "Fine Motor Precision Test" describe the same interface but create completely different product positioning. The first sounds like a game. The second sounds like what Baseline is actually for. Naming something correctly is part of designing it correctly.
Silent failures are harder to find than thrown errors. The chart container ID mismatch produced no console error, no user-visible message — just a missing chart. Defensive programming means checking that things appear, not just that code runs without error.
Recognizing that Fine Motor Precision is a motor learning test — not a snapshot test — reveals something about the quarter question: different types of human function require different types of tracking. Reaction time: track across sessions to see long-term trends. Motor precision: track within sessions to see learning curves. The platform needs to support both models.
Session 19: Security hardening. Professor review identified 3 vulnerabilities: broken RLS, XSS, auth hygiene. Fix all before M5 complete.