Make English the project-wide language: all comments, string literals,
CLI help text, design docs, journal, agent prompts, and README. Only
CLAUDE.md (the user's own instruction file) stays German, and the live
conversation between user and Claude continues in German.
Adds a new "Project language: English" section to docs/DESIGN.md as
the durable convention. No logic changes — translation only. Four
internal error strings in the typechecker were retranslated; no
test asserts on their wording.
Verified: cargo test --workspace passes (44/44).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Vier spezialisierte Agent-Definitionen (implementer, architect, tester,
debugger) im sichtbaren agents/-Verzeichnis. DESIGN.md erweitert um den
Abschnitt "Projekt-Ökosystem" — AILang ist Sprache + CLI + Examples +
Agents + Doku + Tests gleichermaßen. JOURNAL hält den Workflow-Wechsel
auf Orchestrator-Modus fest und ordnet Iteration 4 neu.
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