refactor(test): decouple examples from live test harness (#3)

* refactor(test): break examples/tests cycle; slim examples to pure samples

TurnResult 迁 tests/execution.mjs 解环；删示例测试哈内斯 + 3 个 examples 测试；examples 改独立瘦身演示。三块示例哈内斯覆盖（批清理 owned-scope/sanitizer/ProjectMemory 反泄漏）按决定丢弃。

Task: 1789906942

* docs(examples): restore full topic set to match Go SDK parity

18 个瘦身纯演示（forward 9 + managed 9）+ examples 侧共享 helper（examples/lib），镜像 Go 示例集；不 import tests、import-guarded main。取代之前 gut 的 2 个精简脚本。

Task: 1789906942

* test(live): align file and memory setup with API semantics

Author: moonyue-w