Fix/release drop broken static (#13)

* fix(release): drop broken CGO_ENABLED=0 static build target

smacker/go-tree-sitter requires CGO: the Node type is defined only in
bindings.go behind //go:build cgo, while iter.go references it without
a build tag. With CGO_ENABLED=0 every iter.go:N: undefined: Node fails
the build.

The mcp-filepuff-static target was added in 9205b2b after the last
successful release (v0.2.3) and has never produced an artifact — every
release since has been red. Dropping it restores the working release
shape: darwin_arm64 + linux_amd64 + windows_amd64 CGO binaries, same
as v0.2.3 shipped.

* feat(release): ship darwin_amd64 and linux_arm64 binaries

Shared go-release-cgo.yaml runs each matrix entry natively (no cross-
compile), so adding platforms only needs two edits: a platforms input
in release.yaml and removal of ignore rules in .goreleaser.yaml.

New coverage:
- darwin_amd64 on macos-13 runner (Intel Mac)
- linux_arm64 on ubuntu-24.04-arm runner (ARM servers, Raspberry Pi,
  Apple Silicon via Docker/QEMU)

Kept: darwin_arm64, linux_amd64, windows_amd64.
Still skipped: windows_arm64 (uncommon, ARM Windows runner flakier).

.github/workflows/release.yaml

@@ -20,4 +20,12 @@ jobs:
     with:
       go-version: "1.25"
       rolling-release-tag: "v1"
+      platforms: >-
+        [
+          {"os":"macos-13","goos":"darwin","goarch":"amd64","platform":"darwin_amd64"},
+          {"os":"macos-latest","goos":"darwin","goarch":"arm64","platform":"darwin_arm64"},
+          {"os":"ubuntu-latest","goos":"linux","goarch":"amd64","platform":"linux_amd64"},
+          {"os":"ubuntu-24.04-arm","goos":"linux","goarch":"arm64","platform":"linux_arm64"},
+          {"os":"windows-latest","goos":"windows","goarch":"amd64","platform":"windows_amd64"}
+        ]
     secrets: inherit