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webdev
84a424006e
Since #415 the daemon echoes a `Size` frame at the stream position where the pty changes geometry and the client defers its grid reflow to that marker — but only on local routes, so a remote pane resized mid-flood still parsed queued old-width bytes into the new-width grid, which network transport makes worse. Rather than probing `Version` per pane (a whole routed connection, and for ssh/WSL a whole bridge process, on every spawn and attach), the server advertises the pane protocol's features on its control hello. The answer is cached on the link and read off the host when a pane's route is built, and the route carries it to the terminal at spawn, attach and relink. This is additive within `CONTROL_VERSION` 7: no new field, just extra names in the existing `ControlHelloOk.features`, so an older client cannot choke and an older server that names no echo makes the client reflow at request time as before. A route built while the link is down answers false. Known limitation, inherited from #415's design and not introduced here: there is no timeout if a promised echo never arrives — once deferred, a later identical resize neither re-sends nor reflows, so a wrongly-set bit would freeze the grid at the old geometry. Every traced path makes the control hello and the pane daemon the same build, normally the same process. Closes #416.