Add the close-out documentation for extension dialog support:
- docs/config.md (+ synchronized config.html): extensionDialogsTimeoutMs
in the config matrix, reload/restart guidance, the global config
example, and a new Extension dialogs key-detail section covering the
unattended-dialog safety valve (default 5 min, 0 = forever, effective
deadline is the sooner of the extension's own timeout and this knob).
- docs/plugins.md (+ synchronized plugins.html): new Pi extension
dialogs in PI WEB behavior note for extension authors — confirm/select/
input render inline in the transcript and resolve with the real answer,
answers use a dedicated daemon channel (never the prompt queue, so
tool_call hooks park safely), session_start dialogs are reachable
during create and open, reload rehydration, first-answer-wins across
tabs, abort/runtime-replacement settlement, and the reload-mid-startup
browser-local caveat.
- Add the extension-dialogs changeset (patch) for the release notes.
