chore: engine cleanup, canonical gate, and perf groundwork #1298

Job	Run time
Cargo Deny Check	48s
Preflight (Ubuntu Stable)	2m 21s
Integration Build Check	1s
Lua SDK Tests	1s
Kotlin SDK Test	1s
Sandbox Recovery Smoke	1s
TS SDK Wasm Build	1s
Codegen Drift Check	1s
Android Build Pipeline	1s
iOS Build Pipeline	1s
Clean Room Regeneration	1s
Rust ${{ matrix.rust }} on ${{ matrix.os }}	1s
TS SDK Native on ${{ matrix.os }}	1s
Native Release Artifact on ${{ matrix.os }}	1s
Python SDK on ${{ matrix.os }}	1s
CI Success	4s
.NET SDK on ${{ matrix.os }}	1s
Swift SDK Tests	1s
Go SDK Tests	1s
C++ SDK Tests on ${{ matrix.os }}	1s
C SDK Tests on ${{ matrix.os }}	1s
	3m 31s

Provide feedback