Clean up remaining dead code and dependencies

- Replace unused 'codemirror' barrel dep with explicit @codemirror/{state,
  view,commands,language} sub-packages that were imported but unlisted
- Remove unused exports: writeNamespacedQuery, targetWorkspacePathForRun,
  isWorkspaceDeletionRun, piWebConfigDir, duplicate parsePiWebRuntimeResponse
- Remove unused types: WorkspacePanelFiles, WorkspacePanelHost,
  GetActiveSession, SaveAttachmentsResponse, QueryValues
- Drop now-unused re-exports/imports cascading from the above
- Add knip config + 'npm run knip' script for ongoing dead-code detection

package.json

@@ -32,6 +32,7 @@
     "build:plugin-api": "tsc -p tsconfig.plugin-api.json",
     "build:plugins": "tsc -p tsconfig.plugins.json && node scripts/build-plugins.mjs",
     "typecheck": "tsc --noEmit",
+    "knip": "knip",
     "lint": "eslint \"src/**/*.ts\" \"extensions/**/*.ts\" \"pi-web-plugins/**/*.ts\" vite.config.ts vitest.config.ts",
     "test": "vitest run --config vitest.config.ts",
     "verify": "npm run typecheck && npm run lint && npm test",
@@ -48,6 +49,7 @@
     "changelog:status": "changeset status"
   },
   "dependencies": {
+    "@codemirror/commands": "^6.10.3",
     "@codemirror/lang-css": "^6.3.1",
     "@codemirror/lang-go": "^6.0.1",
     "@codemirror/lang-html": "^6.4.11",
@@ -56,12 +58,14 @@
     "@codemirror/lang-markdown": "^6.5.0",
     "@codemirror/lang-python": "^6.2.1",
     "@codemirror/lang-rust": "^6.0.2",
+    "@codemirror/language": "^6.12.3",
     "@codemirror/legacy-modes": "^6.5.2",
+    "@codemirror/state": "^6.6.0",
+    "@codemirror/view": "^6.42.1",
     "@fastify/static": "^9.1.3",
     "@fastify/websocket": "^11.2.0",
     "@xterm/addon-fit": "^0.11.0",
     "@xterm/xterm": "^6.0.0",
-    "codemirror": "^6.0.2",
     "diff": "^8.0.4",
     "fastify": "^5.6.1",
     "lit": "^3.3.1",
@@ -71,18 +75,19 @@
   },
   "devDependencies": {
     "@changesets/cli": "^2.31.0",
+    "@earendil-works/pi-ai": "^0.79.1",
     "@earendil-works/pi-coding-agent": "^0.79.1",
     "@eslint/js": "^10.0.1",
     "@types/node": "^24.10.1",
     "@types/ws": "^8.18.1",
     "eslint": "^10.3.0",
     "globals": "^17.6.0",
+    "knip": "^6.16.1",
     "tsx": "^4.20.6",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.59.2",
     "vite": "^7.2.4",
-    "vitest": "^4.1.5",
-    "@earendil-works/pi-ai": "^0.79.1"
+    "vitest": "^4.1.5"
   },
   "publishConfig": {
     "access": "public"
@@ -100,8 +105,8 @@
   "homepage": "https://pi-web.dev/",
   "packageManager": "[email protected]",
   "peerDependencies": {
-    "@earendil-works/pi-coding-agent": ">=0.78.0 <1",
-    "@earendil-works/pi-ai": ">=0.78.0 <1"
+    "@earendil-works/pi-ai": ">=0.78.0 <1",
+    "@earendil-works/pi-coding-agent": ">=0.78.0 <1"
   },
   "keywords": [
     "pi-package",