chore(release): prepare v0.4.4

[huangruiteng]

Summary

Prepare LoopX v0.4.4 after M6 effect-program quality gates passed.

• Bump pyproject.toml and loopx.__init__.__version__ to 0.4.4.
• Update the bilingual Dev Book release anchor to v0.4.4.

Validation

• python scripts/release_artifacts.py expected-tag -> v0.4.4
• python scripts/release_artifacts.py validate-tag v0.4.4 -> passed
• loopx --version -> loopx 0.4.4
• dev-book-publication-smoke and docs-governance-smoke: passed
• loopx canary premerge --from-git-diff: selected=10 failures=0, self_merge_allowed=true

No runtime behavior changes.

[huangruiteng]

Review: APPROVED

head 0264ce861。这是对 PR #2986 的完整 owner review。该 PR 准备 LoopX v0.4.4：版本锚点升级到 0.4.4，并同步 bilingual Dev Book 的 release anchor。

验证

• release_artifacts.py expected-tag -> v0.4.4
• release_artifacts.py validate-tag v0.4.4 -> passed
• loopx --version -> loopx 0.4.4
• dev-book-publication / docs-governance smokes: passed
• loopx canary premerge --from-git-diff：selected=10 failures=0，self_merge_allowed=true
• GitHub checks：dependency-review / pytest / build 全部通过

结论

无 blocker。按仓库 merge policy 路由合并，合并后创建 v0.4.4 GitHub Release。