docs: add AGENTS.python/go/typescript.md and pre-push check rules

Mandatory pre-push gates for all three language stacks with exact
commands, common pitfalls, and architecture rules. CLAUDE.md updated
with quick-reference section linking to the new files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.claude/CLAUDE.md

@@ -287,6 +287,37 @@ git push origin main && git push gitea main
 
 ---
 
+## Pre-Push Checks (PFLICHT — VOR JEDEM PUSH)
+
+> Full detail: `.claude/rules/pre-push-checks.md` | Stack rules: `AGENTS.python.md`, `AGENTS.go.md`, `AGENTS.typescript.md`
+
+**NIEMALS pushen ohne diese Checks. CI-Failures blockieren das gesamte Deploy.**
+
+### Python (backend-core, rag-service, embedding-service, control-pipeline)
+
+```bash
+cd <service-dir>
+ruff check . && mypy . --ignore-missing-imports --no-error-summary && pytest tests/ -x -q --no-header
+```
+
+### Go (consent-service, billing-service)
+
+```bash
+cd <service-dir>
+gofmt -l . | grep -q . && exit 1; go vet ./... && golangci-lint run --timeout=5m && go test -race ./... && go build ./...
+```
+
+### TypeScript/Next.js (pitch-deck, admin-v2)
+
+```bash
+cd pitch-deck   # or admin-v2
+npx tsc --noEmit && npm run lint && npm run build
+```
+
+> `npm run build` ist PFLICHT — `tsc` allein reicht nicht. Syntax-Fehler wie `const` inside object literal werden nur vom Build gefangen.
+
+---
+
 ## Kernprinzipien
 
 ### 1. Open Source Policy