docs(34-05): complete German translations plan summary

- All 6 German locale namespaces verified complete and passing
- Key parity test passes (22/22)
- Build passes with both locales

.planning/phases/34-i18n-foundation/34-05-SUMMARY.md

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+---
+phase: 34-i18n-foundation
+plan: "05"
+subsystem: i18n
+tags: [i18n, german, translations, locale, testing]
+dependency_graph:
+  requires: [34-01, 34-02, 34-03, 34-04]
+  provides: [de-locale-complete, key-parity-test]
+  affects: [src/client/locales/de, src/client/lib/i18n.ts, tests/i18n]
+tech_stack:
+  added: []
+  patterns: [key-parity-testing, flat-key-traversal]
+key_files:
+  created: []
+  modified:
+    - src/client/locales/de/collection.json
+decisions:
+  - German translations use formal Sie form throughout
+  - "Thread" kept as "Thread" in German (common loanword)
+  - "Setup" kept as "Setup" in German (common in hobby context)
+  - Key parity test auto-discovers namespaces — no hardcoding needed
+metrics:
+  duration_minutes: 15
+  completed_date: "2026-04-18"
+  tasks_completed: 3
+  files_modified: 1
+requirements: [D-13, D-14, D-15]
+---
+
+# Phase 34 Plan 05: German Translations Summary
+
+German locale complete — all 6 namespaces translated with natural German using formal Sie form, registered in i18n config, and verified via automated key parity test.
+
+## Tasks Completed
+
+| # | Task | Commit | Files |
+|---|------|--------|-------|
+| 1 | Create German translation files for all namespaces | pre-existing (34-04 wave) | src/client/locales/de/*.json |
+| 2 | Register German locale in i18n configuration | pre-existing (34-04 wave) | src/client/lib/i18n.ts |
+| 3 | Write key parity test + fix collection gap | 31297a3 | src/client/locales/de/collection.json, tests/i18n/locales.test.ts |
+
+## Verification Results
+
+- All 6 de/*.json files: valid JSON
+- `bun test tests/i18n/locales.test.ts`: 22 pass, 0 fail
+- `bun run build`: success (914ms)
+- i18n.ts: 6 German imports + de resource block + supportedLngs: ["en", "de"]
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Fixed missing German keys in collection namespace**
+- **Found during:** Task 3 (key parity test)
+- **Issue:** `de/collection.json` was missing 4 keys present in `en/collection.json`: `form.msrp`, `form.purchasePrice`, `form.itemNamePlaceholder`, `form.optionalNotes`
+- **Fix:** Added the 4 missing German translation keys to `src/client/locales/de/collection.json`
+- **Files modified:** src/client/locales/de/collection.json
+- **Commit:** 31297a3
+
+### Pre-existing Work
+
+Tasks 1 and 2 were already complete from prior wave executions (plans 34-01 through 34-04). The German locale files and i18n.ts configuration existed on the branch before this plan executed. This plan's contribution was the gap fix and verifying the test passes.
+
+## Known Stubs
+
+None — all German locale values are substantive translations.
+
+## Threat Flags
+
+None — locale JSON files are static bundled assets with no runtime injection vector.
+
+## Self-Check: PASSED
+
+- src/client/locales/de/collection.json: FOUND
+- tests/i18n/locales.test.ts: FOUND
+- Commit 31297a3: FOUND
+- Build output: PASSED
+- Test output: 22 pass, 0 fail