fix: Signal duplicate replies with streaming + per-platform tool_progress (#6348)

Fixes #4647 — Signal replies duplicated when gateway streaming is enabled.

Root cause: stream_consumer.py did not handle the case where send() returns
success=True but no message_id (Signal behavior). Every stream delta produced
a separate send() call (7+ messages instead of 2), plus the gateway sent
another full duplicate since already_sent was never set.

Changes:
- stream_consumer.py: Add elif branch for success-without-message_id — enters
  fallback mode (sets already_sent, disables editing, sends only continuation)
- signal.py send(): Extract timestamp from signal-cli RPC result as message_id
  so stream consumer follows normal edit→fallback path
- signal.py: Add public stop_typing() delegating to _stop_typing_indicator()
  so base adapter's _keep_typing finally block can clean up typing tasks
- gateway/run.py: Per-platform tool_progress_overrides (#6164) — lets users
  set e.g. signal: off while keeping telegram: all
- hermes_cli/config.py: Add tool_progress_overrides to DEFAULT_CONFIG

Refs: #4647, #6164

hermes_cli/config.py

@@ -392,6 +392,7 @@ DEFAULT_CONFIG = {
         "show_cost": False,       # Show $ cost in the status bar (off by default)
         "skin": "default",
         "tool_progress_command": False,  # Enable /verbose command in messaging gateway
+        "tool_progress_overrides": {},  # Per-platform overrides: {"signal": "off", "telegram": "all"}
         "tool_preview_length": 0,  # Max chars for tool call previews (0 = no limit, show full paths/commands)
     },