docs: drop remaining proto and buf references

Proto and buf are gone; update the build/generate docs to ogen and openapi.

AGENTS.md

@@ -75,9 +75,9 @@ make dev
 # Individual targets
 make build           # build the headscale binary
 make test            # go test ./...
-make fmt             # format Go, docs, proto
-make lint            # lint Go, proto
-make generate        # regenerate protobuf code (after changes to proto/)
+make fmt             # format Go and docs
+make lint            # lint Go
+make generate        # regenerate ogen code (after changes to openapi/)
 make clean           # remove build artefacts
 
 # Direct go test invocations
@@ -266,9 +266,9 @@ Key reminders:
 
   Not Conventional Commits. No `feat:`/`chore:`/`docs:` prefixes.
 
-- **Protobuf regeneration**: changes under `proto/` require
-  `make generate` (which runs `buf generate`) and should land in a
-  **separate commit** from the callers that use the regenerated types.
+- **Code generation**: changes under `openapi/` require `make generate`
+  (which runs `ogen`) and should land in a **separate commit** from the
+  callers that use the regenerated types.
 - **Formatting** is enforced by `golangci-lint` with `golines` (width 88)
   and `gofumpt`. Run `make fmt` or rely on the pre-commit hook.
 - **Logging** uses `zerolog`. Prefer single-line chains
@@ -288,6 +288,6 @@ Key reminders:
 - **`.claude/agents/` is deprecated.** Do not create new agent files
   there. Put behavioural guidance in this file and procedural guidance
   in the nearest README.
-- **Do not edit `gen/`** — it is regenerated from `proto/` by
+- **Do not edit `gen/`** — it is regenerated from `openapi/` by
   `make generate`.
-- **Proto changes + code changes should be two commits**, not one.
+- **Spec changes + code changes should be two commits**, not one.

README.md

@@ -92,8 +92,7 @@ Please read the [CONTRIBUTING.md](./CONTRIBUTING.md) file.
 
 ### Requirements
 
-To contribute to headscale you would need the latest version of [Go](https://golang.org)
-and [Buf](https://buf.build) (Protobuf generator).
+To contribute to headscale you would need the latest version of [Go](https://golang.org).
 
 We recommend using [Nix](https://nixos.org/) to setup a development environment. This can
 be done with `nix develop`, which will install the tools and give you a shell.
@@ -110,9 +109,6 @@ formatted with [`golines`](https://github.com/segmentio/golines) (width 88) and
 Please configure your editor to run the tools while developing and make sure to
 run `make lint` and `make fmt` before committing any code.
 
-The **Proto** code is linted with [`buf`](https://docs.buf.build/lint/overview) and
-formatted with [`clang-format`](https://clang.llvm.org/docs/ClangFormat.html).
-
 The **docs** are formatted with [`mdformat`](https://mdformat.readthedocs.io).
 
 The **rest** (Markdown, YAML, etc) is formatted with [`prettier`](https://prettier.io).
@@ -122,8 +118,6 @@ Check out the `.golangci.yaml` and `Makefile` to see the specific configuration.
 ### Install development tools
 
 - Go
-- Buf
-- Protobuf tools
 
 Install and activate:
 
@@ -133,8 +127,8 @@ nix develop
 
 ### Testing and building
 
-Some parts of the project require the generation of Go code from Protobuf
-(if changes are made in `proto/`) and it must be (re-)generated with:
+Some parts of the project require generated Go code from the OpenAPI spec
+(if changes are made in `openapi/`) and it must be (re-)generated with:
 
 ```shell
 make generate

docs/setup/install/source.md

@@ -7,9 +7,8 @@
 
     **It might be outdated and it might miss necessary steps**.
 
-Headscale can be built from source using the latest version of [Go](https://golang.org) and [Buf](https://buf.build)
-(Protobuf generator). See the [Contributing section in the GitHub
-README](https://github.com/juanfont/headscale#contributing) for more information.
+Headscale can be built from source using the latest version of [Go](https://golang.org). See the [Contributing
+section in the GitHub README](https://github.com/juanfont/headscale#contributing) for more information.
 
 ## OpenBSD