Per review, docs/plugins.md was a parallel guide outside the published
navigation. Its genuinely unique material moves into
website/docs/developer-guide/plugins/index.md: the middleware
registration surface (all four VALID_MIDDLEWARE kinds with contracts and
chaining rules), the per-API-call request hooks, and the
allow_tool_override operator grant (which also fixes pre-existing text
implying override=True alone suffices for non-bundled plugins). Every
migrated claim was re-verified against current main; stale material
(deep-copy claim, approval-surface coverage, a hook that is not in
VALID_HOOKS on main) was corrected or dropped rather than copied.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PnMCvi2vXqfs996AjVeF2F
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