chore: engine cleanup, canonical gate, and perf groundwork #1296

Job	Run time
Preflight (Ubuntu Stable)	4m 10s
Cargo Deny Check	49s
Lua SDK Tests	1s
CI Success	3s
Integration Build Check	1s
Kotlin SDK Test	1s
Sandbox Recovery Smoke	1s
TS SDK Wasm Build	1s
Native Release Artifact on ${{ matrix.os }}	1s
TS SDK Native on ${{ matrix.os }}	1s
Codegen Drift Check	1s
Rust ${{ matrix.rust }} on ${{ matrix.os }}	1s
Swift SDK Tests	1s
Android Build Pipeline	1s
iOS Build Pipeline	1s
Clean Room Regeneration	1s
.NET SDK on ${{ matrix.os }}	1s
C++ SDK Tests on ${{ matrix.os }}	1s
C SDK Tests on ${{ matrix.os }}	1s
Go SDK Tests	1s
Python SDK on ${{ matrix.os }}	1s
	5m 20s

Provide feedback