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Complete the Pattern matching section with deconstruction coverage and the introductory tutorial #55928
Description
Everyday C# PR 21 — Pattern matching: deconstruction + tutorial
PR 21 is the committed clean boundary that fully completes Pattern matching (§11). Once the overview/basic-pattern and advanced-pattern-form work is live, this closes the remaining core article gap and moves the introductory tutorial into Fundamentals, without pulling the optional Functional techniques tutorial into September's scope.
Revise deconstruct.md to cover records, tuples, custom Deconstruct, and mixed deconstructions at Fundamentals level. Pull tutorials/patterns-objects.md into fundamentals/tutorials/pattern-matching.md, updating snippets, toc.yml, and redirects (including the former functional/deconstruct.md path). Leave the advanced data-driven pattern tutorial where it is unless implementation finds a safe, already-planned move.
Done when §11 has no remaining planned core gaps, deconstruction coverage is coherent with tuples/records/custom Deconstruct/Discards, the tutorial is adapted with redirects, and no former functional/ deconstruction path breaks. See the Phase F plan for scope.
Activity
Complete pattern matching: deconstruction and object-behavior tutorial (