chore: import .claude command skills, CLAUDE.md, .gitignore, next_steps.md

- Vendor local .claude/ command skills (autopilot, plan, implement, etc.)
- Add CLAUDE.md pointing slash commands to .claude/commands/*/SKILL.md
- Untrack docs-Lokal/ and ignore .planning/ for local-only planning docs
- Include next_steps.md pulled from upstream

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,31 @@
+# Project Skills
+
+## Skill Resolution
+
+When the user invokes a slash command `/skill-name`, resolve it using the following priority:
+
+1. **Nested format**: `.claude/commands/skill-name/SKILL.md`
+2. **Flat format**: `.claude/commands/skill-name.md`
+
+Read the resolved file and execute its workflow exactly as written.
+
+## Available Skills
+
+| Command | Path |
+|---------|------|
+| `/autopilot` | `.claude/commands/autopilot/SKILL.md` |
+| `/research` | `.claude/commands/research/SKILL.md` |
+| `/plan` | `.claude/commands/plan/SKILL.md` |
+| `/decompose` | `.claude/commands/decompose/SKILL.md` |
+| `/implement` | `.claude/commands/implement/SKILL.md` |
+| `/deploy` | `.claude/commands/deploy/SKILL.md` |
+| `/document` | `.claude/commands/document/SKILL.md` |
+| `/code-review` | `.claude/commands/code-review/SKILL.md` |
+| `/refactor` | `.claude/commands/refactor/SKILL.md` |
+| `/security` | `.claude/commands/security/SKILL.md` |
+| `/problem` | `.claude/commands/problem/SKILL.md` |
+| `/new-task` | `.claude/commands/new-task/SKILL.md` |
+| `/test-spec` | `.claude/commands/test-spec/SKILL.md` |
+| `/test-run` | `.claude/commands/test-run/SKILL.md` |
+| `/retrospective` | `.claude/commands/retrospective/SKILL.md` |
+| `/ui-design` | `.claude/commands/ui-design/SKILL.md` |