docs: stabilization directive + TRUTH document + AI session prompts + dockerignore

- STABILIZATION_DIRECTIVE.md: feature freeze rules, banned actions, priorities
- TRUTH.md: single source of truth for system state (crate counts, store counts)
- AI_SESSION_PROMPTS.md: three-layer prompt system for AI sessions
- Industry agent delivery design spec
- Stabilization test suite for regression prevention
- Delete stale ISSUE-TRACKER.md
- Add .dockerignore for container builds
- Add brainstorm session artifacts

.dockerignore

@@ -0,0 +1,42 @@
+# Build artifacts
+target/
+node_modules/
+
+# Environment and secrets
+.env
+.env.*
+*.pem
+*.key
+
+# IDE and OS
+.vscode/
+.idea/
+.DS_Store
+Thumbs.db
+
+# Git
+.git/
+.gitignore
+
+# Logs
+*.log
+
+# Docker
+docker-compose.yml
+Dockerfile
+
+# Documentation (not needed in image)
+docs/
+*.md
+!README.md
+
+# Test files
+tests/
+tests/e2e/
+admin-v2/tests/
+
+# Claude/development tools
+.claude/
+.planning/
+.superpowers/
+plans/