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/coderule.mdc

@@ -0,0 +1,23 @@
+---
+description: "Enforces concise, comment-free, environment-aware coding standards with strict scope discipline and test verification"
+alwaysApply: true
+---
+# Coding preferences
+- Always prefer simple solution
+- Generate concise code
+- Do not put comments in the code
+- Do not put logs unless it is an exception, or was asked specifically
+- Do not put code annotations unless it was asked specifically 
+- Write code that takes into account the different environments: development, production
+- You are careful to make changes that are requested or you are confident the changes are well understood and related to the change being requested
+- Mocking data is needed only for tests, never mock data for dev or prod env
+- When you add new libraries or dependencies make sure you are using the same version of it as other parts of the code
+
+- Focus on the areas of code relevant to the task
+- Do not touch code that is unrelated to the task
+- Always think about what other methods and areas of code might be affected by the code changes
+- When you think you are done with changes, run tests and make sure they are not broken
+- Do not rename any databases or tables or table columns without confirmation. Avoid such renaming if possible.
+- Do not create diagrams unless I ask explicitly
+- Make sure we don't commit binaries, create and keep .gitignore up to date and delete binaries after you are done with the task
+- Never force-push to main or dev branches