New describe_node tool returns the full property bag (bounds, classes,
text, state flags, hintText, viewIdResourceName) for a nodeId from
the P1 stable-ID scheme. Also resolves that P1 emitted nodeIds but
/tap and /scroll ignored them — BridgeCommandHandler now parses
nodeId, resolves via ScreenReader.findNodeById, dispatches against
the node's bounds center. Closes the end-to-end nodeId contract.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
