read_file/write_file passed the raw path to open(), so a tilde path like
~/notes.txt failed ("not found") — the shell's ~ expansion never happened
because there's no shell. Agents then fell back to bash to reach home-dir
files. Expand ~ (and ~user) with os.path.expanduser before opening.
Checks: python -m py_compile src/tool_execution.py.
* feat(web-fetch): add web_fetch tool to read a specific URL's content
* test(web-fetch): add SSRF coverage and fail closed on empty DNS resolution
Add explicit SSRF regression tests for the web_fetch path covering
loopback, private LAN ranges, link-local/metadata, IPv6 private/local,
redirect-into-private, and unsupported schemes. Harden _public_http_url
to fail closed when a hostname resolves to no addresses.