[FEP-0065] FlagTree TLE GPU buffer aliasing and layout control tracking

## Summary

Tracking issue for [FEP-0065](https://github.com/flagos-ai/community/blob/main/fep/sig-compiler/0065-flagtree-tle-gpu-buffer-aliasing-and-layout-control.md) — FlagTree TLE GPU Buffer Aliasing and Layout Control (sig-compiler, `Implementable`, Target Version: FlagOS 2.2). FEP merged in #65.

## Open items (blocking `Implementable` → `Implemented`)

- [ ] **Implementation landed in [FlagTree](https://github.com/flagos-ai/FlagTree)** — `tle.gpu.alloc(..., alias=...)` typed shared-memory views with static validation, and `tle.gpu.set_layout` explicit distributed-layout assignment.
- [ ] **Related PRs filled in** — the FEP's Related PRs section currently points at the repo, not concrete PRs; list them as they land.
- [ ] **Test Plan executed** and FEP Status flipped to `Implemented` via follow-up PR.

## Schedule

Per [#47](https://github.com/flagos-ai/community/issues/47) / `release/2.2/schedule.md`: implementation code lands by **Code Freeze 2026-08-31**; testing window runs to 09-24.

## References

- FEP PR: #65
- Implementation repository: https://github.com/flagos-ai/FlagTree
- Release tracking: #47