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/rules/cursor-meta.mdc

@@ -0,0 +1,25 @@
+---
+description: "Enforces naming, frontmatter, and organization standards for all .cursor/ configuration files"
+globs: [".cursor/**"]
+---
+# .cursor/ Configuration Standards
+
+## Rule Files (.cursor/rules/)
+- Kebab-case filenames, `.mdc` extension
+- Must have YAML frontmatter with `description` + either `alwaysApply` or `globs`
+- Keep under 500 lines; split large rules into multiple focused files
+
+## Skill Files (.cursor/skills/*/SKILL.md)
+- Must have `name` and `description` in frontmatter
+- Body under 500 lines; use `references/` directory for overflow content
+- Templates live under their skill's `templates/` directory
+
+## Command Files (.cursor/commands/)
+- Plain markdown, no frontmatter
+- Kebab-case filenames
+
+## Agent Files (.cursor/agents/)
+- Must have `name` and `description` in frontmatter
+
+## Security
+- All `.cursor/` files must be scanned for hidden Unicode before committing (see cursor-security.mdc)