`~/.hermes/hooks/` auto-loads every valid `HOOK.yaml` + `handler.py` at
gateway startup with no `plugins.enabled` gate. That is the documented
contract since 3988c3c245 ("Implicit (dir trust)" in the comparison
table), but the plugins page's "disabled by default" promise read as if
it covered gateway hooks too (#37963). Maintainer ruling: keep implicit
dir trust, fix the docs.
- hooks.md: new "Trust model" section stating exactly what loads, when,
how, and that placing the files is the opt-in; comparison-table cell
links to it and the plugin-hooks consent cell now says
`plugins.enabled`.
- plugins.md: note scoping `plugins.enabled` away from gateway hooks.
- developer-guide/plugins: one sentence at the gateway-hook recipe.
- security.md: "Trusted-by-placement extension points" section
cross-linked from hooks.md.
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