feat(remote-dev): add zoxide/clang-tools/node/uv/AI agents; bring git+ssh; SSH-format signing

home.nix:
- Add zoxide (fixes 'command not found' on shell start), clang-tools
  (no compiler driver), nodejs (Mason npm LSPs), uv (Mason python LSPs;
  does not install python3 in PATH, so Ubuntu's /usr/bin/python3 stays
  the system default), claude-code, github-copilot-cli.
- Refine the leaf-tools policy comment: explicit denylist of build-
  toolchain binaries that would shadow Ubuntu's via PATH, plus a
  carve-out for editor/AI runtimes (node, uv, clang-tools).
- Symlink ~/.config/git/{config,attributes,ignore} and ~/.ssh/config
  from the dotfiles tree.

dot_config/zsh/dot_zshrc: guard direnv/zoxide/fzf inits with
'command -v X >/dev/null &&' so a fresh machine without one of them
no longer prints a stderr error on every shell start.

dot_config/git/config: append unconditional '[include] path =
~/.config/git/config.local' for machine-local overrides (used on the
remote-dev VM to switch to SSH-format signing via the forwarded
agent). Git silently skips missing include files.

remote-dev/README.md: document the update flow (config-only vs HM
rebuild), the single-shell leaf-tools policy, and the one-time VM
setup for SSH-format commit signing (allowed_signers + config.local,
ForwardAgent yes on the host).

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