feat: add --quiet/-Q flag for programmatic single-query mode

Adds -Q/--quiet to `hermes chat` for use by external orchestrators
(Paperclip, scripts, CI). When combined with -q, suppresses:
- Banner and ASCII art
- Spinner animations
- Tool preview lines (┊ prefix)

Only outputs:
- The agent's final response text
- A parseable 'session_id: <id>' line for session resumption

Usage: hermes chat -q 'Do something' -Q
Used by: Paperclip adapter (@nousresearch/paperclip-adapter-hermes)

hermes_cli/main.py

@@ -486,6 +486,7 @@ def cmd_chat(args):
         "provider": getattr(args, "provider", None),
         "toolsets": args.toolsets,
         "verbose": args.verbose,
+        "quiet": getattr(args, "quiet", False),
         "query": args.query,
         "resume": getattr(args, "resume", None),
         "worktree": getattr(args, "worktree", False),
@@ -1918,6 +1919,11 @@ For more help on a command:
         action="store_true",
         help="Verbose output"
     )
+    chat_parser.add_argument(
+        "-Q", "--quiet",
+        action="store_true",
+        help="Quiet mode for programmatic use: suppress banner, spinner, and tool previews. Only output the final response and session info."
+    )
     chat_parser.add_argument(
         "--resume", "-r",
         metavar="SESSION_ID",