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Restructure for human review: mainline first, cases illustrate the design instead of specifying it. - New Architecture and Benefits and Drawbacks sections; the calls derivation stays expanded as the flagship example while schema enumerations, window-rule listings, and executor edge-case handling move out of the document. - The cross-signal promise is stated honestly: neighbours and their source tables are discovered first, their telemetry is the next query — one engine, two statements; the worked example shows the full declaration -> entity -> edge -> telemetry flow. - Default materialisation added as the most direct alternative to read-time derivation, with its costs. Signed-off-by: Dennis Zhuang <killme2008@gmail.com>