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>

package.json

@@ -42,6 +42,7 @@
     "dist/signal/**",
     "dist/slack/**",
     "dist/telegram/**",
+    "dist/line/**",
     "dist/tui/**",
     "dist/tts/**",
     "dist/web/**",
@@ -154,6 +155,7 @@
     "@grammyjs/runner": "^2.0.3",
     "@grammyjs/transformer-throttler": "^1.2.1",
     "@homebridge/ciao": "^1.3.4",
+    "@line/bot-sdk": "^10.6.0",
     "@lydell/node-pty": "1.2.0-beta.3",
     "@mariozechner/pi-agent-core": "0.49.3",
     "@mariozechner/pi-ai": "0.49.3",