Add owned-disc setup, map selection and Windows release packaging

docs/installation.md

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+# Windows installation
+
+`Build-Release.ps1` produces `target/skate3rust-windows-x64.zip`. Keep its
+`support` directory beside `skate3rust.exe`. The game links Bevy and the MSVC
+runtime statically; the setup helper bundles Python, NumPy, Pillow and Tcl/Tk.
+
+On first launch, setup asks for a local Xbox 360 Skate 3 ISO. It downloads
+hash-pinned portable Blender and extract-xiso distributions from their
+publishers. No game files are downloaded or included in the package.
+
+The conversion pipeline:
+
+1. Extracts the disc into a new installation workspace.
+2. Preserves native animation banks and state graphs from `miscload.big`.
+3. Reads the big-endian 64-bit AttribSys schema and collections from `db.big`.
+   Settings are decoded from the disc, with numeric hashes retained for names
+   absent from debug strings. The JSON export serves the fields consumed by
+   this engine; it is not a general VLT editor or portable array serialization.
+4. Builds the default modular skater from the CAC archive, including textures,
+   morph settings, the native rig and its four board-relative IK targets.
+   Gameplay animations are evaluated from ABIN by the Rust runtime.
+5. Converts each `worldDIST_*.big` into a `.skate` map. The supplied map exporter
+   runs in v14 storage mode, with native collision archives and grind splines
+   embedded. University uses the supplied exporter's starting location. Other
+   districts select a broad upward collision face near the district origin.
+6. Runs the game's asset and map loaders before publishing `installation.json`.
+   This validates loading, not gameplay. Conversion intermediates are removed
+   after their output succeeds. Failed workspaces retain logs for diagnosis.
+
+Data lives under `%LOCALAPPDATA%/Skate3RustEngine`. `installation.json` points
+to the completed installation. Conversion tools are cached separately, so
+retrying does not download them again. `setup-error.log` reports setup errors;
+each installation also has `setup.log` with converter output.
+
+The Escape menu discovers installed `.skate` files. Loading a map starts a new
+game process and closes the current session so physics and render resources
+are recreated. A fresh launch defaults to University. Development checkouts
+with `assets/private/game.json` retain their existing local assets and default
+test world; `--assets DIRECTORY` also selects a prepared asset set explicitly.