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

src/shared/apiTypes.ts

@@ -175,10 +175,6 @@ export interface SavedPromptAttachment {
   size: number;
 }
 
-export interface SaveAttachmentsResponse {
-  attachments: SavedPromptAttachment[];
-}
-
 export interface SessionModel {
   provider?: string;
   id?: string;

src/shared/piWebStatusParsing.ts

@@ -1,4 +1,4 @@
-import type { PiWebCapability, PiWebComponentStatus, PiWebInstallationInfo, PiWebRuntimeComponent, PiWebRuntimeResponse, PiWebVersionResponse } from "./apiTypes.js";
+import type { PiWebCapability, PiWebComponentStatus, PiWebInstallationInfo, PiWebRuntimeComponent, PiWebVersionResponse } from "./apiTypes.js";
 import { isPiWebCapability } from "./capabilities.js";
 
 export function parsePiWebVersionResponse(value: unknown): PiWebVersionResponse | undefined {
@@ -13,19 +13,6 @@ export function parsePiWebVersionResponse(value: unknown): PiWebVersionResponse
   return { packageName, generatedAt, components: { web, sessiond } };
 }
 
-export function parsePiWebRuntimeResponse(value: unknown): PiWebRuntimeResponse | undefined {
-  if (!isRecord(value)) return undefined;
-  const packageName = value["packageName"];
-  const generatedAt = value["generatedAt"];
-  const components = value["components"];
-  if (typeof packageName !== "string" || packageName === "" || typeof generatedAt !== "string" || generatedAt === "" || !isRecord(components)) return undefined;
-  const web = parsePiWebRuntimeComponent(components["web"]);
-  const sessiond = parsePiWebRuntimeComponent(components["sessiond"]);
-  const capabilities = parsePiWebCapabilities(value["capabilities"]);
-  if (web === undefined || sessiond === undefined || capabilities === undefined) return undefined;
-  return { packageName, generatedAt, components: { web, sessiond }, capabilities };
-}
-
 export function parsePiWebRuntimeComponent(value: unknown): PiWebRuntimeComponent | undefined {
   if (!isRecord(value)) return undefined;
   const component = value["component"];

src/shared/workspaceDeletion.ts

@@ -1,7 +1,7 @@
 export const workspaceDeleteOperation = "workspace.delete";
 export const workspaceDeleteOperationMetadataKey = "pi.operation";
 export const targetWorkspaceIdMetadataKey = "target.workspaceId";
-export const targetWorkspacePathMetadataKey = "target.workspacePath";
+const targetWorkspacePathMetadataKey = "target.workspacePath";
 
 export interface WorkspaceDeletionTarget {
   id: string;