Add pkgx manifest for just-mcp

projects/github.com/promptexecution/just-mcp/README.md

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+# just-mcp pkgx package
+
+This pantry entry installs the Just MCP server built by `just-mcp` releases. The package manifest downloads a tarball whose name matches the target triple (`just-mcp-${target}.tar.gz`) from the GitHub release corresponding to the current tag (see `.github/workflows/build-binaries.yml` for the artifact names).
+
+## Packaging requirements
+
+- Every release must publish the archives `just-mcp-x86_64-unknown-linux-gnu.tar.gz`, `just-mcp-aarch64-unknown-linux-gnu.tar.gz`, `just-mcp-x86_64-apple-darwin.tar.gz`, `just-mcp-aarch64-apple-darwin.tar.gz`, and `just-mcp-x86_64-pc-windows-msvc.tar.gz` so pkgx can download them per host/arch.
+- The manifest pulls the version from GitHub tags (it strips the leading `v`) and places the extracted binary under `${PKGX_DIR:-$HOME/.pkgx}/bin` (with `.exe` for Windows) so subsequent `pkgx just-mcp` invocations run the installed CLI.
+- Run `pkgx just-mcp --version` after merging the pantry PR to make sure the release assets are reachable.

projects/github.com/promptexecution/just-mcp/package.yml

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+distributable:
+  url: https://github.com/PromptExecution/just-mcp/archive/refs/tags/{{version.tag}}.tar.gz
+  strip-components: 1
+
+versions:
+  github: PromptExecution/just-mcp/tags
+
+description: Production-ready MCP server that exposes Justfile recipes over MCP.
+
+build:
+  dependencies:
+    rust-lang.org: '>=1.89'
+  script:
+    # missed version bump
+    - sed -i '1,20s/^version = ".*"$/version = "{{version}}"/' Cargo.toml
+    - cargo install --path . --root {{prefix}}
+
+provides:
+  - bin/just-mcp
+
+test: test "$(just-mcp --version)" = "just-mcp {{version}}"