docs/web-ui/ had four pages, all written as deep implementation
reference (dashboard.md alone is 1466 lines of wire shapes and DOM
mechanics) - there was nothing here written for an operator actually
using the dashboard day to day.
Add docs/web-ui/README.md: genuinely task-oriented content (what the
dashboard is, where the tabs are, the things you'd actually do -
checking an agent, answering a pending question, approving a config
change, granting a permission, reading logs) with pointers into the
existing pages for implementation depth. Point docs/web-ui.md at it as
the operator starting point.
Deliberately not touching dashboard.md/agent.md/shape.md/css-vars.md -
reflowing 1466 lines of dense, working reference content in place
turned out to be a much bigger and more error-prone task than "lead
with the user fact" suggested at a glance (see hyperhive#1898). The
subdir's landing page carries the user-facing content; the existing
pages stay exactly as they are, as the depth layer underneath it.
Verified the new page actually renders as the subdir's index via the
website repo's new subdir-landing-page support (hyperhive/website
PR #46): a real build of the prose-docs derivation confirms
web-ui/index.html now exists, the root index links straight to it, and
every internal link resolves correctly.
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