cleanup: remove clawd/openclaw references, fix permissions, add architecture docs

- Replace all ~/clawd and ~/.clawdbot paths with ~/echo-core equivalents
  in tools (git_commit, ralph_prd_generator, backup_config, lead-gen)
- Update personality files: TOOLS.md repo/paths, AGENTS.md security audit cmd
- Migrate HANDOFF.md architectural decisions to docs/architecture.md
- Tighten credentials/ dir to 700, add to .gitignore
- Add .claude/ and *.pid to .gitignore
- Various adapter, router, and session improvements from prior work

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

src/router.py

@@ -1,6 +1,8 @@
 """Echo Core message router — routes messages to Claude or commands."""
 
 import logging
+from typing import Callable
+
 from src.config import Config
 from src.claude_session import (
     send_message,
@@ -25,11 +27,20 @@ def _get_config() -> Config:
     return _config
 
 
-def route_message(channel_id: str, user_id: str, text: str, model: str | None = None) -> tuple[str, bool]:
+def route_message(
+    channel_id: str,
+    user_id: str,
+    text: str,
+    model: str | None = None,
+    on_text: Callable[[str], None] | None = None,
+) -> tuple[str, bool]:
     """Route an incoming message. Returns (response_text, is_command).
 
     If text starts with / it's a command (handled here for text-based commands).
     Otherwise it goes to Claude via send_message (auto start/resume).
+
+    *on_text* — optional callback invoked with each intermediate text block
+    from Claude, enabling real-time streaming to the adapter.
     """
     text = text.strip()
 
@@ -61,7 +72,7 @@ def route_message(channel_id: str, user_id: str, text: str, model: str | None =
             model = (channel_cfg or {}).get("default_model") or _get_config().get("bot.default_model", "sonnet")
 
     try:
-        response = send_message(channel_id, text, model=model)
+        response = send_message(channel_id, text, model=model, on_text=on_text)
         return response, False
     except Exception as e:
         log.error("Claude error for channel %s: %s", channel_id, e)