docs(01): capture phase context (assumptions mode)

.planning/phases/01-grundger-st-tippmechanik/01-DISCUSSION-LOG.md

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+# Phase 1: Grundgerüst + Tippmechanik - Discussion Log (Assumptions Mode)
+
+> **Audit trail only.** Do not use as input to planning, research, or execution agents.
+> Decisions captured in CONTEXT.md — this log preserves the analysis.
+
+**Date:** 2026-03-29
+**Phase:** 01-Grundgerüst + Tippmechanik
+**Mode:** assumptions
+**Areas analyzed:** Screen Management Architecture, IndexedDB Schema, Typing Exercise Scope, Companion Placeholders, Level Progression, Adaptive Tempo
+
+## Assumptions Presented
+
+### Screen Management Architecture
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| All 5 screens as DOM containers, toggled via CSS classes with fade transitions | Likely | SPEC.md line 929: "5 Screens, nur einer sichtbar, Transitions mit CSS fade" |
+
+### IndexedDB Schema
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Create full schema with all 5 stores upfront, only implement read/write for progress + settings | Confident | FNDN-04 in REQUIREMENTS.md: "IndexedDB-Wrapper mit allen Stores" |
+
+### Typing Exercise Scope
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Only "Üben" phase implemented; "Entdecken" and "Wörter bauen" deferred to Phase 3 | Confident | TYPE-05, TYPE-06, TYPE-07 mapped to Phase 3 in REQUIREMENTS.md |
+
+### Companion Placeholders
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Emoji placeholders for companion selection, no companion during typing | Likely | SPEC.md line 930: "Platzhalter-Emojis"; ASST-03/04 mapped to Phase 2 |
+
+## Corrections Made
+
+No corrections — all assumptions confirmed.
+
+## External Research Flagged
+
+- Vite 6.x vanilla-ts template defaults and tsconfig
+- Biome configuration for TypeScript strict + Vite
+- IndexedDB wrapper approach: custom vs `idb` library