initial agent-mgr: app builder platform MVP

Go API server + Preact UI + Claude Code adapter.
- App-centric model (ideas, not repos)
- AgentProvider interface for multi-agent support
- K8s pod lifecycle for sandboxed agent sessions
- Gitea integration (create repos, push branches)
- WebSocket streaming for live session output
- Woodpecker CI/CD pipelines (kaniko build + kubectl deploy)

docker/entrypoint.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -euo pipefail
+cd /workspace
+
+# Run claude interactively, streaming JSON output
+claude --output-format stream-json "$@"
+EXIT_CODE=$?
+
+# After claude exits, push whatever it did
+if [ -n "$(git status --porcelain)" ]; then
+  git add -A
+  git commit -m "agent session ${SESSION_ID:-unknown}"
+  git push origin "agent/${SESSION_ID:-unknown}"
+fi
+
+exit $EXIT_CODE