feat(distribution): binary release pipeline + brew + winget

- .github/workflows/release-cli.yml: build self-contained binaries via
  `bun build --compile` for darwin/linux/windows × x64/arm64 on every
  cli-v* tag, attach to GitHub Release with SHA256SUMS, auto-bump the
  homebrew tap on non-prerelease versions.
- packaging/homebrew/claudemesh.rb.template: formula template for the
  homebrew-claudemesh tap.
- packaging/winget/claudemesh.yaml.template: winget manifest template.
- /install script now detects absence of Node and downloads the
  platform-appropriate binary from the GitHub Release, installs to
  ~/.claudemesh/bin, and shims into ~/.local/bin — zero Node required.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packaging/homebrew/claudemesh.rb.template

@@ -0,0 +1,54 @@
+# Homebrew formula template — lives in the `alezmad/homebrew-claudemesh` tap.
+#
+# The release-cli workflow bumps `version`, `url`, and `sha256` per platform
+# via `brew bump-formula-pr`. This template is the source shape — copy it
+# into the tap repo as `Formula/claudemesh.rb` when bootstrapping, then let
+# CI keep it up to date.
+
+class Claudemesh < Formula
+  desc "Peer mesh for Claude Code sessions"
+  homepage "https://claudemesh.com"
+  version "1.0.0-alpha.28"
+  license "MIT"
+
+  on_macos do
+    if Hardware::CPU.arm?
+      url "https://github.com/alezmad/claudemesh/releases/download/cli-v#{version}/claudemesh-darwin-arm64"
+      sha256 "REPLACED_BY_CI"
+    else
+      url "https://github.com/alezmad/claudemesh/releases/download/cli-v#{version}/claudemesh-darwin-x64"
+      sha256 "REPLACED_BY_CI"
+    end
+  end
+
+  on_linux do
+    if Hardware::CPU.arm?
+      url "https://github.com/alezmad/claudemesh/releases/download/cli-v#{version}/claudemesh-linux-arm64"
+      sha256 "REPLACED_BY_CI"
+    else
+      url "https://github.com/alezmad/claudemesh/releases/download/cli-v#{version}/claudemesh-linux-x64"
+      sha256 "REPLACED_BY_CI"
+    end
+  end
+
+  def install
+    bin.install Dir["*"].first => "claudemesh"
+  end
+
+  def caveats
+    <<~EOS
+      To enable click-to-launch from invite emails:
+        claudemesh url-handler install
+
+      To show live peer count in Claude Code:
+        claudemesh install --status-line
+
+      Shell completions:
+        claudemesh completions zsh > "$(brew --prefix)/share/zsh/site-functions/_claudemesh"
+    EOS
+  end
+
+  test do
+    assert_match "claudemesh", shell_output("#{bin}/claudemesh --version")
+  end
+end