feat(cli): v0.6.3 — e2e file crypto module + encrypted share_file

- add crypto/file-crypto.ts: encryptFile, decryptFile, sealKeyForPeer, openSealedKey
- update share_file: when to= set, encrypts file + seals key per recipient
- update get_file: decrypts if encrypted + sealedKey present
- add grant_file_access tool: re-seals Kf for a new peer without re-upload
- add getSessionPubkey/getSessionSecretKey getters on BrokerClient
- add grantFileAccess WS method on BrokerClient
- bump version to 0.6.3

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.6.0",
+  "version": "0.6.3",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",