* docs: stop recommending pip install hermes-agent; point to install script
The install script is the only supported install path (it provisions a
managed, isolated uv environment). Replace bare `pip install hermes-agent`
primary-install recommendations with the curl install script, and rewrite
optional-extra snippets (`pip install "hermes-agent[X]"`) to the managed-env
form `cd ~/.hermes/hermes-agent && uv pip install -e ".[X]"` that matches the
installer and the English quickstart.
Covers English docs + zh-Hans mirrors, the achievements plugin README, and
realigns the zh-Hans quickstart to the English Desktop-installer-first layout
(dropping its stale "Method A — pip (simplest)" section).
* docs: drop pip as a supported install/update method
Removes the 'pip installs' supported-method sections from updating.md and
cli-commands.md (EN + zh-Hans): the curl install script is the only supported
way to install/update the Hermes CLI. The _cmd_update_pip pip/pipx branches
remain in code as an undocumented safety net for users who already have such an
install, but the docs no longer advertise pip as a path.
Also normalizes a bare `pip install -e '.[acp]'` to the managed-env form.
Leaves python-library.md untouched: importing AIAgent as a library dependency
into your own project is a distinct use case where pip is correct.
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