feat: stream files as binary frames over WebSocket (#659)

Replace base64-in-JSON file transfers with binary WebSocket frames to
unblock the JS thread when assistant markdown messages contain images.
Receive cost (JSON.parse over multi-MB base64) and persist cost (base64
re-encode to disk) both removed.

- Split daemon-client `exploreFileSystem` into `listDirectory` + `readFile`;
  `readFile` returns `{ bytes, mime, size, modifiedAt }`. Encoding stays
  private to the seam.
- New `packages/server/src/shared/binary-frames/` module hosts terminal
  frames (moved from `terminal-stream-protocol.ts`) and new file-transfer
  opcodes (`FileBegin` / `FileChunk` / `FileEnd`) with request-id correlation.
- Add optional `acceptBinary` to `FileExplorerRequestSchema`. New daemons
  emit binary frames when set; legacy JSON path remains for old clients.
  Compat fallback lives only inside `readFile`.
- New `persistAttachmentFromBytes` writes bytes directly: native via
  `expo-file-system` `File.write(Uint8Array)`, web via Blob -> IndexedDB,
  desktop via new `write_attachment_bytes` IPC. `persistAttachmentFromBase64`
  removed.

packages/cli/src/commands/worktree/archive.ts

@@ -1,5 +1,6 @@
 import path from "path";
 import type { Command } from "commander";
+import type { DaemonClient } from "@getpaseo/server";
 import { connectToDaemon, getDaemonHost } from "../../utils/client.js";
 import type {
   CommandOptions,
@@ -51,7 +52,7 @@ export async function runArchiveCommand(
     throw error;
   }
 
-  let client;
+  let client: DaemonClient;
   try {
     client = await connectToDaemon({ host: options.host });
   } catch (err) {

packages/cli/src/commands/worktree/ls.ts

@@ -1,6 +1,7 @@
 import type { Command } from "commander";
 import { homedir } from "node:os";
 import { basename, join, sep } from "node:path";
+import type { DaemonClient } from "@getpaseo/server";
 import { connectToDaemon, getDaemonHost } from "../../utils/client.js";
 import type { CommandOptions, ListResult, OutputSchema, CommandError } from "../../output/index.js";
 
@@ -62,7 +63,7 @@ export async function runLsCommand(
 ): Promise<WorktreeLsResult> {
   const host = getDaemonHost({ host: options.host });
 
-  let client;
+  let client: DaemonClient;
   try {
     client = await connectToDaemon({ host: options.host });
   } catch (err) {