v0.0.6: Shared resource management, SDK fixes, exec-based file I/O

chore(sdk): bump SDK versions to 0.0.5

fix(ci): add public access for npm scoped package, rename PyPI packag…

…e to den-sdk

v0.0.3: Security hardening, SDK improvements, community files

Security:
- Transport-level SSRF protection (DNS rebinding prevention)
- Cloud metadata IP blocking (AWS, GCP, Azure, Alibaba, IPv6)
- Error information leaking fixed across all handlers
- Rate limiter hardening (IP-only keying, entry cap, safe close)
- Health/version endpoints outside auth for K8s probes

MCP: 2 new tools (delete_file, mkdir), enriched descriptions
SDKs: Go storage types, Python context manager, TS binary writeFile
Community: CONTRIBUTING.md, SECURITY.md, CODE_OF_CONDUCT.md

ci: fix goreleaser config — remove missing Dockerfile and homebrew tap