feat: add hash routing for pushy agents

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a03397-4d51-7fd1-8ff2-946eb22ea2bc

src/tamq/cli.py

@@ -169,6 +169,7 @@ manual messaging from a managed shell:
   @TARGET: MESSAGE...
   @                         compose with a visible, Tab-selectable recipient
   @ MESSAGE...              fast reply (ordinary shell quoting applies)
+  #TARGET: MESSAGE...       agent-input alias in a tapped pushy session
   tamq inbox [--filter COMMAND]
 """,
     )
@@ -336,6 +337,9 @@ def main(argv: list[str] | None = None) -> int:
         if args.no_service and args.mode is not None:
             print("tamq: --mode cannot be combined with --no-service", file=sys.stderr)
             return 2
+        tap_enabled = args.tap or (
+            selected_mode == "pushy" and args.initial_command is not None
+        )
         manager = TmuxManager()
         try:
             if not args.no_service:
@@ -356,7 +360,7 @@ def main(argv: list[str] | None = None) -> int:
             print("tamq service failed to start with the required delivery capability; use --no-service to open repos without messaging", file=sys.stderr)
             return 1
         try:
-            endpoint = manager.ensure_plan(launch_plan, tap=args.tap)
+            endpoint = manager.ensure_plan(launch_plan, tap=tap_enabled)
         except (TmuxError, OSError) as exc:
             print(f"tamq: {exc}", file=sys.stderr)
             return 2
@@ -393,6 +397,7 @@ def main(argv: list[str] | None = None) -> int:
             "service": not args.no_service,
             "messaging": registered,
             "mode": "none" if args.no_service else ("tap" if args.tap else selected_mode),
+            "input_observation_requested": tap_enabled,
             "delivery_mode": "none" if args.no_service else (
                 "pane" if args.tap else endpoint_delivery_mode
             ),