Math tracker (/trackers/math): Evan Chen's Napkin, chapter by chapter

Schema math (parts, chapters, sections, activity), seeded with all 100 chapters
(Ch 0-94, appendix A-E), 647 sections, PDF pages, exercise counts and approximate
prereqs. Triggers stamp started_at/completed_at and log status/exercise/note/section
changes; math.apply_progress(jsonb) applies the JSON format bots send. Private by
default via MATH_PRIVATE in #lib/math (owner-only prefix + lock in every tracker list).
Overall + per-part progress, current chapter, prereq hints, quick status buttons,
exercises stepper, notes, optional section ticks, activity log, dependency chart.
Deploy preflight checks the math schema (4 tables, 100 chapters).

src/lib/projects.ts

@@ -1,3 +1,4 @@
+import { MATH_PRIVATE } from './math';
 // Real projects (tools and experiments). Personal data trackers live in `trackers`.
 export const projects = [
 	{
@@ -386,6 +387,13 @@ const allTrackers: readonly (Tracker & { private: boolean })[] = [
 		external: false,
 		private: true
 	},
+	{
+		name: 'math',
+		subtitle: "working through Evan Chen's Napkin: chapters, exercises and notes",
+		href: '/trackers/math',
+		external: false,
+		private: MATH_PRIVATE
+	},
 	{
 		name: 'health',
 		subtitle: 'body, workouts, sleep, meds and vaccinations',