docs(02): capture phase context (assumptions mode)

.planning/phases/02-gemini-integration-asset-pipeline/02-DISCUSSION-LOG.md

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+# Phase 2: Gemini-Integration + Asset-Pipeline - 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:** 02-Gemini-Integration + Asset-Pipeline
+**Mode:** assumptions
+**Areas analyzed:** Build Script Runtime, IndexedDB Schema Extension, Welcome Screen Avatar Replacement, Gemini API Client Architecture, Fallback System, Companion Text Integration
+
+## Assumptions Presented
+
+### Build Script Runtime
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Node.js via npx tsx, isomorphic API module | Confident | SPEC.md line 392, package.json has no tsx yet |
+
+### IndexedDB Schema Extension
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Keep DB version 1, API counts in settings store | Likely | db.ts version 1 with 5 stores, simple counting suffices |
+
+### Welcome Screen Avatar Replacement
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Static imports in characters.ts, avatarUrl field | Likely | src/assets/companions/ dirs exist, CompanionDefinition has emoji |
+
+### Gemini Image API Format
+| Assumption | Confidence | Evidence |
+|------------|-----------|----------|
+| Base64 inlineData, response_modalities: IMAGE | Likely | SPEC.md lines 636-646, types.ts Blob storage |
+
+## Corrections Made
+
+No corrections — all assumptions confirmed.
+
+## External Research Flagged
+
+- Gemini 3.1 Flash Image Preview API exact format with character consistency
+- tsx devDependency version for build script