chore: add Claude tooling and optimize token efficiency

- .claude/scripts/bump.sh: one-command version bump + commit + push
- .claude/scripts/new-feature.sh: branch creation helper
- .claude/session-context.md: session start context
- CLAUDE.md: reduced to dispatch table, no rule duplication
- docs/project-structure.md: restructured as dense module reference

Version: 0.2.1

CHANGELOG.md

@@ -5,6 +5,19 @@ Format: `[MAJOR.MINOR.PATCH] - YYYY-MM-DD`
 
 ---
 
+## [0.2.1] - 2026-04-05
+
+### Changed
+- `CLAUDE.md` auf reine Dispatch-Tabelle reduziert (keine Regelwiederholungen)
+- `docs/project-structure.md` als dichte Modulreferenz-Vorlage strukturiert
+
+### Added
+- `.claude/scripts/bump.sh` – Version + CHANGELOG + commit + push in einem Befehl
+- `.claude/scripts/new-feature.sh` – Feature/Fix/Debug-Branch aus develop erstellen
+- `.claude/session-context.md` – Sessionstart-Kontext (Version, Branch, offene Arbeit)
+
+---
+
 ## [0.2.0] - 2026-04-05
 
 ### Added