add Stabilizing f16 goal

src/2026/stabilizing-f16.md

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+# Stabilizing `f16`
+
+| Metadata         |                                                                                  |
+| :--------------- | -------------------------------------------------------------------------------- |
+| Point of contact | @folkertdev                                   |
+| Status           | Proposed                                                                         |
+| Tracking issue   |    |
+| Other tracking issues | https://github.com/rust-lang/rust/issues/116909 |
+| Zulip channel    | N/A  |
+| Stabilization | true |
+
+## Summary
+
+In recent years we've seen increasing hardware support for the `f16` and `f128` float types. Especially for `f16` support was originally motivated by machine learning/AI, but these types have since also found applications in other domains like graphics and physics simulations.
+
+With LLVM 22, the remaining blockers in the backends have been cleared for `f16`, and therefore stabilizing this type in 2026 is realistic. 
+
+## Motivation
+
+### The status quo
+
+The `f16` and `f128` are unstable. Their implementations are mostly complete, with some missing const support. For `f128` there are still some serious ABI issues that require fixes in LLVM. For `f16` LLVM 22 has the support we need.
+
+### What we propose to do about it
+
+We will stabilize `f16`, and push `f128` as far as we can. There is not much to design at this point.
+
+### Work items over the next year
+
+| Task        | Owner(s) | Notes |
+| ----------- | -------- | ----- |
+| complete support in const-eval/miri | @folkertdev  |       |
+| improve support in `rustc_codegen_gcc` | @folkertdev  |       |
+| remove `cfg(target_has_reliable_f16)` | @folkertdev, @tgross35 | | 
+| write the stabilization report | @folkertdev, @tgross35  |       |
+
+## Team asks
+
+With @tgross35 as the dedicated reviewer, the asks of the teams are limited.  
+
+| Team       | Support level | Notes                                   |
+| ---------- | ------------- | --------------------------------------- |
+| [compiler] | small              |                                         |
+| [libs]     | small              |                                         |
+| [lang]     | small              | this might be medium? We don't need anything special, but occasionally being fast-tracked would be nice |
+
+## Frequently asked questions
+
+### What do I do with this space?