feat(catalog): add mlr, gh-aw, and gh-aw-firewall

catalog/gh-aw-firewall.json

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+{
+  "name": "gh-aw-firewall",
+  "category": "platform",
+  "install_method": "github_release_binary",
+  "description": "GitHub Agentic Workflows Firewall: Squid-proxy-based egress firewall that sandboxes AI agent commands in a Docker container with a domain allowlist",
+  "homepage": "https://github.com/github/gh-aw-firewall",
+  "github_repo": "github/gh-aw-firewall",
+  "binary_name": "awf",
+  "download_url_template": "https://github.com/github/gh-aw-firewall/releases/download/{version}/awf-linux-{arch}",
+  "arch_map": {
+    "x86_64": "x64",
+    "aarch64": "arm64"
+  },
+  "notes": "Direct binary download, not an archive. Upstream uses 'x64' (not 'amd64') in asset names. Requires Docker at runtime to launch the sandboxed Squid proxy.",
+  "tags": [
+    "github",
+    "ci",
+    "agentic",
+    "security"
+  ]
+}

catalog/gh-aw.json

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+{
+  "name": "gh-aw",
+  "category": "platform",
+  "install_method": "github_release_binary",
+  "description": "GitHub Agentic Workflows: gh extension that compiles natural-language Markdown workflow definitions into hardened GitHub Actions workflows",
+  "homepage": "https://github.com/github/gh-aw",
+  "github_repo": "github/gh-aw",
+  "binary_name": "gh-aw",
+  "download_url_template": "https://github.com/github/gh-aw/releases/download/{version}/linux-{arch}",
+  "arch_map": {
+    "x86_64": "amd64",
+    "aarch64": "arm64",
+    "armv7l": "arm"
+  },
+  "notes": "Direct binary download, not an archive. Upstream's preferred install path is 'gh extension install github/gh-aw' (requires the gh CLI). The catalog uses a standalone binary install since gh extensions are not yet modeled as an install_method.",
+  "tags": [
+    "github",
+    "ci",
+    "agentic"
+  ]
+}

catalog/mlr.json

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+{
+  "name": "mlr",
+  "category": "general",
+  "install_method": "github_release_binary",
+  "description": "Like awk/sed/cut/jq for name-indexed data such as CSV, TSV, JSON and JSON Lines",
+  "homepage": "https://miller.readthedocs.io/",
+  "github_repo": "johnkerl/miller",
+  "binary_name": "mlr",
+  "download_url_template": "https://github.com/johnkerl/miller/releases/download/{version}/miller-{version_nov}-linux-{arch}.tar.gz",
+  "arch_map": {
+    "x86_64": "amd64",
+    "aarch64": "arm64",
+    "armv7l": "armv7"
+  },
+  "tags": [
+    "data",
+    "csv",
+    "json",
+    "text-utils"
+  ]
+}