docs(02-04): complete companion text module plan

- SUMMARY.md with task commits and decisions - STATE.md advanced to plan 4 of 5, 80% progress - ROADMAP.md updated with plan progress - Requirements COMP-01 through COMP-04 marked complete
2026-03-29 12:06:54 +02:00
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+---
+phase: 02-gemini-integration-asset-pipeline
+plan: 04
+subsystem: companion
+tags: [gemini, ai-text, fallback, companion, german]
+
+# Dependency graph
+requires:
+  - phase: 02-01
+    provides: "generateText, checkRateLimit, incrementApiCall, loadConfig"
+  - phase: 02-02
+    provides: "fallback greetings, letter intros, forest comments"
+provides:
+  - "getGreeting: AI or fallback greeting with time-of-day context"
+  - "getLetterIntro: AI or fallback letter introduction with finger description"
+  - "getForestComment: AI or fallback forest element comment"
+affects: [03-exercise-flow, 04-forest-rendering]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [api-first-fallback, rate-limit-guard, companion-prompt-templates]
+
+key-files:
+  created: [src/companion/companion.ts, src/companion/companion.test.ts]
+  modified: []
+
+key-decisions:
+  - "Prompt templates use ue/oe/ae transliteration consistent with codebase convention"
+  - "Each function independently checks config and rate limits (no shared wrapper) for clarity"
+
+patterns-established:
+  - "API-first fallback: loadConfig -> checkRateLimit -> generateText -> fallback on any null"
+  - "System prompts enforce max 25 words, simple German, no performance praise per COMP-04"
+
+requirements-completed: [COMP-01, COMP-02, COMP-03, COMP-04]
+
+# Metrics
+duration: 1min
+completed: 2026-03-29
+---
+
+# Phase 02 Plan 04: Companion Text Module Summary
+
+**Companion text module with 3 exported functions (getGreeting, getLetterIntro, getForestComment) using Gemini API-first strategy with curated German fallbacks**
+
+## Performance
+
+- **Duration:** 1 min
+- **Started:** 2026-03-29T10:04:46Z
+- **Completed:** 2026-03-29T10:06:01Z
+- **Tasks:** 1 (TDD: RED + GREEN)
+- **Files modified:** 2
+
+## Accomplishments
+- Companion text module with API-first fallback strategy for all 3 dialogue types
+- System prompts enforce max 25 words, simple German, no performance praise
+- 13 tests covering API success, API failure, no config, and rate-limited paths
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1 (RED): Companion test suite** - `6fba02c` (test)
+2. **Task 1 (GREEN): Companion text module implementation** - `4b4aa8e` (feat)
+
+_TDD task: test file committed first (RED), then implementation (GREEN)._
+
+## Files Created/Modified
+- `src/companion/companion.ts` - Companion text module with getGreeting, getLetterIntro, getForestComment
+- `src/companion/companion.test.ts` - 13 tests covering all fallback paths and API integration
+
+## Decisions Made
+- Prompt templates use ue/oe/ae transliteration consistent with existing codebase convention
+- Each function independently checks config and rate limits rather than using a shared wrapper, keeping the code straightforward and readable
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Companion text module ready for integration into exercise flow
+- All 3 functions exported and tested, ready for import by UI screens
+- Depends on config.json with valid Gemini API key for AI-generated text; works without it via fallbacks
+
+---
+*Phase: 02-gemini-integration-asset-pipeline*
+*Completed: 2026-03-29*