fix(background): Wave 2 - fix interrupt status checks, display text, error recovery grace, LSP JSONC

- fix(background): include "interrupt" status in all terminal status checks (3 files)
- fix(background): display "INTERRUPTED" instead of "CANCELLED" for interrupted tasks
- fix(cli): add error recovery grace period in poll-for-completion
- fix(lsp): use JSONC parser for config loading to support comments

All changes verified with tests and typecheck.

src/tools/lsp/server-config-loader.ts

@@ -4,6 +4,7 @@ import { join } from "path"
 import { BUILTIN_SERVERS } from "./constants"
 import type { ResolvedServer } from "./types"
 import { getOpenCodeConfigDir } from "../../shared"
+import { parseJsonc } from "../../shared/jsonc-parser"
 
 interface LspEntry {
   disabled?: boolean
@@ -24,10 +25,10 @@ interface ServerWithSource extends ResolvedServer {
   source: ConfigSource
 }
 
-function loadJsonFile<T>(path: string): T | null {
+export function loadJsonFile<T>(path: string): T | null {
   if (!existsSync(path)) return null
   try {
-    return JSON.parse(readFileSync(path, "utf-8")) as T
+    return parseJsonc(readFileSync(path, "utf-8")) as T
   } catch {
     return null
   }