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feat(remote): mirror a session's context to the Mac that attached it (#634)

* feat(remote): mirror a session's context to the Mac that attached it

an attached row never showed its origin's title-bar context, because the presentation stream had no frame for it and setContext published nothing to the hub. The stream gains a context frame and an optional snapshot field, and setContext publishes on a real change. An older viewer skips the unknown kind and an older origin never sends it, so the protocol version stays at 1.

the viewer keeps the mirrored value in Session.mirroredContext, an observed property outside the observation-ignored remotePresentation, so the title bar redraws. The title bar and the tree's context read effectiveContext, the local value when one is set and the mirrored one otherwise. The mirror keeps updating under a local value, so clear on an attached row removes the local override and shows the origin's latest context. Leaving connected withdraws the mirror and keeps a local value. The mirror path never saves, and `tree.changed` follows the shown value.

attach does not seed the context from zmx.tree, which would turn the origin's label into a local override that wins forever. Flag, watermark and name stay unmirrored.

* fix(remote): validate a mirrored context and list context on every mirroring surface

review fixes for the context mirror. `applyRemoteContext` stored the frame's string unchecked, the one context inlet that skipped `Session.validateContext`, so a far side that does not follow the contract could put a multi-line or 250 KB value into `tree`. It now validates as the snapshot decoder does: an invalid value becomes nil and a valid one is trimmed.

two test gaps closed. The disconnect test asserted only after the local clear, so it passed even if the drop erased the local context; it now asserts the local value right after the stream goes. A hosted test renders the title bar in normal and compact modes with only a mir... (continued)

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