Daemon: OpenAI-compatible /v1/completions for Zed

Parses Qwen-format FIM prompts (prefix- or suffix-first, optional repo/file headers) back into
prefix/suffix and rebuilds them in the trained layout; mode from the model string (ac:symbols /
ac:simple); files located via workspaceRoots by path or content. extensions/zed/README.md documents
the Zed settings; untested against real Zed traffic yet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J39imRDT8L7xYbWzsVWd8A

daemon/src/config.ts

@@ -58,6 +58,8 @@ export interface DaemonConfig {
   /** Where opted-in edit recordings from editors are appended (the opt-in is the editor setting). */
   recording: { dir: string }
   stateFile: string
+  /** Workspace roots for clients that can't send one (Zed via /v1/completions): files are looked up under these. */
+  workspaceRoots?: string[]
   /** Exit after this many minutes without any request (0 = never). Editors poll every 15 s while open. */
   idleShutdownMinutes?: number
   /** Opaque tag reported by /health (the VS Code extension uses it to replace daemons left over from older versions). */