Add anthropics/buffa plugin v0.5.2

plugins/anthropics/buffa/source.yaml

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+source:
+  crates:
+    crate_name: protoc-gen-buffa

plugins/anthropics/buffa/v0.5.2/.dockerignore

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+*
+!Dockerfile

plugins/anthropics/buffa/v0.5.2/Dockerfile

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+# syntax=docker/dockerfile:1.23
+FROM rust:1.95.0-alpine3.23@sha256:606fd313a0f49743ee2a7bd49a0914bab7deedb12791f3a846a34a4711db7ed2 AS builder
+RUN apk add --no-cache musl-dev
+WORKDIR /app
+ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
+RUN --mount=type=cache,target=/usr/local/cargo/registry,sharing=locked --mount=type=cache,target=/root/target \
+    cargo install protoc-gen-buffa --version 0.5.2 --locked --root /app
+
+FROM gcr.io/distroless/static-debian13:latest@sha256:47b2d72ff90843eb8a768b5c2f89b40741843b639d065b9b937b07cd59b479c6 AS base
+
+FROM scratch
+COPY --link --from=base / /
+COPY --link --from=builder /app/bin/protoc-gen-buffa /protoc-gen-buffa
+USER nobody
+ENTRYPOINT ["/protoc-gen-buffa"]

plugins/anthropics/buffa/v0.5.2/buf.plugin.yaml

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+version: v1
+name: buf.build/anthropics/buffa
+plugin_version: v0.5.2
+source_url: https://github.com/anthropics/buffa
+description: Generates Rust message types with buffa, a zero-copy Protobuf implementation with editions support and no_std compatibility.
+output_languages:
+  - rust
+spdx_license_id: Apache-2.0
+license_url: https://github.com/anthropics/buffa/blob/v0.5.2/LICENSE
+registry:
+  cargo:
+    rust_version: "1.85"
+    deps:
+      # Runtime: wire format, Message trait, view types, JSON helpers.
+      # https://github.com/anthropics/buffa/blob/v0.5.2/buffa/Cargo.toml
+      - name: "buffa"
+        req: "0.5.2"
+        default_features: true
+        features:
+          - json
+      # Well-known types (Timestamp, Duration, Any, Struct, etc.).
+      # Generated code references these via the auto-injected
+      # extern_path mapping `.google.protobuf` -> `::buffa_types::google::protobuf`.
+      - name: "buffa-types"
+        req: "0.5.2"
+        default_features: true
+        features:
+          - json
+      # Generated code derives `::serde::Serialize` / `::serde::Deserialize`
+      # directly when json=true, so serde must be a direct dep.
+      - name: "serde"
+        req: "1"
+        default_features: true
+        features:
+          - derive
+  opts:
+    # Enable serde derives + proto3 JSON mapping helpers. Required for
+    # downstream plugins that need the Connect protocol's JSON codec.
+    - json=true
+    # Zero-copy view types. Default, but explicit for clarity.
+    - views=true
+    # Emit one `<dotted.package>.rs` per proto package instead of one
+    # file per proto file. Matches the prost/tonic filename convention
+    # the BSR Rust SDK lib.rs synthesis expects.
+    - file_per_package=true

tests/testdata/buf.build/anthropics/buffa/v0.5.2/eliza/plugin.sum

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+h1:ktcklOdY2UGmhTov4n3zaTVV0iCPTFbaog1tzH7DP/c=

tests/testdata/buf.build/anthropics/buffa/v0.5.2/petapis/plugin.sum

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+h1:kF+N9OmF6c28gEY8W515PuHMwC/Cf0aA5oCSzA1URIw=