fix: v0.1.16 — fix message delivery between same-member sessions

excludeSenderMemberId blocked delivery to ALL peers sharing the
same member_id (all sessions from one join). Replaced with
excludeSenderSessionPubkey which only excludes the sender's own
session — peers with different session pubkeys receive correctly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/cli/package.json

@@ -1,6 +1,6 @@
 {
   "name": "claudemesh-cli",
-  "version": "0.1.15",
+  "version": "0.1.16",
   "description": "Claude Code MCP client for claudemesh — peer mesh messaging between Claude sessions.",
   "keywords": [
     "claude-code",