security: remove .claude/ from repo, add to .gitignore

[LEEI1337]

Summary

• Entfernt .claude/skill-registry.json aus dem öffentlichen Repository
• .gitignore erweitert um .claude/ Pattern

Hintergrund

.claude/ ist als lokale Claude-Code-Konfiguration gemeint und gehört nicht in ein öffentliches Repository.

Reversibilität

Soft-Remove: aktueller HEAD nach Merge sauber, Git-Historie behält die Datei weiterhin sichtbar.

Test plan

• git ls-files .claude/ → leer auf branch
• .gitignore enthält .claude/-Pattern
• Diff: 1 Deletion + 1 .gitignore-Add (= 2 files changed, 2 insertions(+), 224 deletions(-))

🤖 Generated with Claude Code

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve registry consistency checks in CI

Ignoring the entire .claude/ directory here guarantees .claude/skill-registry.json is absent on fresh checkouts, and validate_registry_consistency() then exits early with only a warning (scripts/validate.py:276-283) instead of running the mismatch checks (scripts/validate.py:299-316). Because CI still runs python scripts/validate.py (.github/workflows/ci.yml:112), this change silently disables the registry drift detection the validator was meant to enforce, so missing/extra skill entries stop being caught.

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