docs(design): network tools brainstorm + GPTel Tool Work hierarchy

Adds docs/design/gptel-network-tools.org capturing the brainstorm
output for the next gptel-tools batch -- net_diagnose, net_discover,
net_services, network_status, dns_lookup -- with argv shapes,
target-gating guardrails for nmap, and a ~47-test sketch.

Restructures the GPTel Tool Work parent in todo.org with seven themed
categories: Git, Org, messaging, file/buffer, filesystem, media /
reading, and dev workflow.  Each carries a body framing the design
choice and stub child themes.  Filesystem covers the pandoc /
imagemagick / ffmpeg / ripgrep / fd / file+exiftool / jq+yq surface
plus an eshell escape hatch.  Per-theme spec lands in the task body
once written.  Implementation tasks join as siblings once the spec
is approved.

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