refactor(godot): integrate and simplify the Godot module implementation

[joeykchen]

Integrate the lifecycle, ownership, resource, binding and sprite refactors for Native and normal Web. The final cleanup passes GdObj/GdInt inputs by value with generator-managed BigInt conversion, shares texture/font preparation, removes mirrored Wasm-export caches, and deletes production hooks used only by tests. Recording and Worker modes are outside this change.

Parent: dev at 8b3790203aee. Dependency-stage merge order: 07/23, 10/23, 22/23.

This is the combined delivery PR for the topic reviews below. Merging it includes their changes.

Topic	PR
refactor/godot-lifecycle-controls	#1914
fix/godot-web-session-lifetime	#1915
refactor/godot-audio-ownership	#1916
refactor/godot-object-access	#1917
refactor/godot-visual-resources	#1918
refactor/godot-abi-boundaries	#1919
refactor/godot-bindings-simple	#1920
refactor/godot-resource-lifetimes	#1921
refactor/godot-sprite-algorithms	#1922
refactor/godot-manager-lifecycle	#1923
perf/godot-web-scalars	#1924

Prior integrated validation: make generate and matching Native/normal Web builds passed; 72 Native cases (639 assertions), codegen tests, 33 Node tests, js/wasm bindings and standalone ABI/UBSan checks passed. 05-Animation ran in Native and Web with animation, input and restart checks. The separate letterbox branch fixes the known host/content-size layout issue. The current update only shortens commit messages; all source trees match the validated history. Validation record. Current diff check also reports an existing extra EOF blank line in the Web ABI test stub.

Related PRs: the same-head alias is #1926; stage letterboxing follows in #1927 with engine support from goplus/godot#336.

[fennoai]

Reviewed the complete fixed range from 8b3790203aee3cb713dc1a01b91f583d926830b8 through 45fa2090c033d6852e1b3eec631712e3a0dbb3e3, covering the lifecycle, ownership, resource, binding, sprite, ZIP, build-tool, and code-generation changes. I found no PR-introduced correctness or regression issue that meets the review threshold.

Validation passed for go test ./fs/zip, the code-generation module tests, binding/runtime packages, go test ./... outside the unrelated existing internal/projectpolicy failure, bash godot_modules/spx/tests/run_abi_test.sh, and node --test godot_modules/spx/web/tests/native_array.test.cjs. git diff --check reports only the documented extra blank line at EOF in godot_modules/spx/web/tests/stubs/godot_types.h.