Add agentcfg extension

extensions/agentcfg/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+compiled_raycast_rust
+
+# misc
+.DS_Store

extensions/agentcfg/.npmrc

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+# Block all dependency lifecycle scripts (esbuild works without its
+# postinstall: it ships prebuilt binaries as optional platform dependencies).
+ignore-scripts=true
+
+# Refuse to install package versions published less than this many days ago —
+# the standard defense against just-published supply-chain compromises.
+min-release-age=1

extensions/agentcfg/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/agentcfg/CHANGELOG.md

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+# agentcfg Changelog
+
+## [Initial Version] - {PR_MERGE_DATE}
+
+- Manage Items: browse skills, hooks, and instruction files with per-target install state, filter by target, and toggle, install, uninstall, or sync per item
+- Sync Configs: run agentcfg sync from root search with a result toast

extensions/agentcfg/README.md

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+# agentcfg for Raycast
+
+Manage [agentcfg](https://github.com/jorgenosberg/agentcfg) from Raycast: browse every skill, hook, and instruction file in your source tree, see per-target install state, and toggle, install, or sync without opening a terminal.
+
+## Requirements
+
+The extension shells out to the agentcfg CLI, which must be installed separately:
+
+```sh
+brew install jorgenosberg/tap/agentcfg
+```
+
+The binary is auto-detected from common install locations (`/opt/homebrew/bin`, `/usr/local/bin`, `~/go/bin`). If yours lives elsewhere, set the path in the extension preferences.
+
+Run `agentcfg init` once in a terminal before first use to bootstrap your config and source tree.
+
+## Commands
+
+- **Manage Items** — one view over your whole setup. Filter by target with the dropdown, see each item's install state per target (linked, copied, drifted, absent, disabled), open the detail pane for the full breakdown, and toggle, install, uninstall, or sync directly. In All Targets mode, "Toggle on Target" flips an item for a single target.
+- **Sync Configs** — runs `agentcfg sync` across all targets and reports the result as a toast.

extensions/agentcfg/eslint.config.js

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+const { defineConfig } = require("eslint/config");
+const raycastConfig = require("@raycast/eslint-config");
+
+module.exports = defineConfig([
+  ...raycastConfig,
+]);