docs: v3.22.1 release notes

CHANGELOG.md

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+### Goa v3.22.1
+
+#### Highlights
+- JSON‑RPC 2.0 transport joins HTTP and gRPC as a first‑class option. Generate
+  servers, clients, CLI, streaming (WebSocket, SSE), batch requests, and
+  notifications from the same design. This makes Goa a great fit for RPC‑style
+  APIs across protocols without duplicating effort ([PR #3734](https://github.com/goadesign/goa/pull/3734)).
+- Toolchain updated to Go 1.24 (toolchain `go1.24.4`) with refreshed
+  dependencies for better performance, diagnostics, and editor support
+  ([PR #3765](https://github.com/goadesign/goa/pull/3765)).
+
+#### Compatibility
+- Requires Go 1.24+. Please update your Go toolchain before upgrading
+  ([PR #3765](https://github.com/goadesign/goa/pull/3765)).
+- Generated example CLI: `UsageCommands()` now returns `[]string` (previously a
+  single string). Help text and behavior are unchanged; only the return type
+  matters if you consume it programmatically
+  ([PR #3734](https://github.com/goadesign/goa/pull/3734)).
+
+#### New Features
+- JSON‑RPC 2.0 (now first‑class alongside HTTP and gRPC)
+  - Full code generation for servers and clients; batch requests and
+    notifications; streaming via WebSocket and SSE; CLI integration
+    (`-jsonrpc`/`-j` when both HTTP and JSON‑RPC are available).
+  - New `jsonrpc` package: request/response types, error codes, helpers
+    (`MakeSuccessResponse`, `MakeErrorResponse`, `MakeNotification`,
+    `IDToString`) and a `StreamConfig` with `With*` options to tune WebSocket
+    behavior (timeouts, buffers, retries, compression, ping).
+  - Comprehensive docs and integration tests to help you hit the ground
+    running ([PR #3734](https://github.com/goadesign/goa/pull/3734)).
+
+#### Improvements
+- Conversion functions are now generated per target package. If your user types
+  include `Meta("struct:pkg:path", "...")`, their conversions land in the
+  correct `convert.go` next to those types. This fixes cross‑package builds and
+  smooths Windows paths ([PR #3748](https://github.com/goadesign/goa/pull/3748),
+  fixes [Issue #3745](https://github.com/goadesign/goa/issues/3745)).
+- Validation
+  - Fix `OneOf` validation in view types when a union arm uses a format (e.g.
+    `FormatDateTime`). Prevents incorrect pointer assumptions and the resulting
+    compile errors ([PR #3749](https://github.com/goadesign/goa/pull/3749)).
+- HTTP decoding
+  - Harden query parsing: malformed nested brackets no longer panic and now
+    surface a clear error: “invalid query string: malformed brackets”
+    ([PR #3746](https://github.com/goadesign/goa/pull/3746)).
+- Codegen robustness and clarity
+  - Default array handling: only cast defaults when the element type is an
+    alias; supports `[]any`, `[]string`, numeric/bool slices, and
+    `expr.ArrayVal`; avoids reflection for simpler, faster code
+    ([PR #3760](https://github.com/goadesign/goa/pull/3760)).
+  - Correct package qualification for inline structs referencing user types.
+    This stabilizes builds in mixed package layouts and the JSON‑RPC IT
+    harness ([PR #3762](https://github.com/goadesign/goa/pull/3762)).
+  - `SnakeCase` also replaces “/” with “_” to produce safer identifiers
+    ([PR #3760](https://github.com/goadesign/goa/pull/3760)).
+- Testing utilities
+  - Golden diffs now use `testify` for cleaner output. Use `-update` (or `-u`)
+    to refresh goldens. Legacy diff flags are removed; `CompareOrUpdateGolden`
+    remains for easy migration. Auto‑formatting of `.go` and `.json` goldens
+    is built‑in ([PR #3766](https://github.com/goadesign/goa/pull/3766)).
+- Modernization sweep
+  - Broad internal cleanups (`maps.Copy`, `slices.Contains`, `http.NoBody`,
+    fewer builtin shadowing issues, consistent file perms) improve code health
+    across the board ([PR #3750](https://github.com/goadesign/goa/pull/3750)).
+
+#### Documentation and Misc
+- Expanded JSON‑RPC documentation with practical examples so you can adopt it
+  confidently ([PR #3734](https://github.com/goadesign/goa/pull/3734)).
+- Minor typo fixes and sponsor card update
+  ([PR #3756](https://github.com/goadesign/goa/pull/3756),
+  [PR #3752](https://github.com/goadesign/goa/pull/3752)).
+
+#### Dependency Updates
+- Go 1.24 toolchain; gRPC 1.74.2; x/tools 0.36.0; x/text up to 0.28.0; newer
+  protobuf, x/net, x/sys, and related modules
+  ([PR #3765](https://github.com/goadesign/goa/pull/3765),
+  [PR #3751](https://github.com/goadesign/goa/pull/3751),
+  [PR #3739](https://github.com/goadesign/goa/pull/3739),
+  [PR #3740](https://github.com/goadesign/goa/pull/3740)).
+
+#### Thanks
+Huge thanks to everyone who contributed to this release:
+- @raphael
+- @rorydbain
+- @RedMarcher
+- @tchssk
+- @chailandau
+- @dependabot[bot]
+
+Full changelog: https://github.com/goadesign/goa/compare/v3.21.5...v3.22.1
+