feat: Add Line plugin (#1630)

* feat: add LINE plugin (#1630) (thanks @plum-dawg)

* feat: complete LINE plugin (#1630) (thanks @plum-dawg)

* chore: drop line plugin node_modules (#1630) (thanks @plum-dawg)

* test: mock /context report in commands test (#1630) (thanks @plum-dawg)

* test: limit macOS CI workers to avoid OOM (#1630) (thanks @plum-dawg)

* test: reduce macOS CI vitest workers (#1630) (thanks @plum-dawg)

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

extensions/line/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "@clawdbot/line",
+  "version": "2026.1.22",
+  "type": "module",
+  "description": "Clawdbot LINE channel plugin",
+  "clawdbot": {
+    "extensions": [
+      "./index.ts"
+    ],
+    "channel": {
+      "id": "line",
+      "label": "LINE",
+      "selectionLabel": "LINE (Messaging API)",
+      "docsPath": "/channels/line",
+      "docsLabel": "line",
+      "blurb": "LINE Messaging API bot for Japan/Taiwan/Thailand markets.",
+      "order": 75,
+      "quickstartAllowFrom": true
+    },
+    "install": {
+      "npmSpec": "@clawdbot/line",
+      "localPath": "extensions/line",
+      "defaultChoice": "npm"
+    }
+  },
+  "devDependencies": {
+    "clawdbot": "workspace:*"
+  }
+}