chore: sweep Phase A framing from comments/docstrings

Replace "Phase A/B", "routing revamp" references with
"routing simplification" in docstrings and comments.
No code logic changes.

Files updated:
- meshai/config.py (SinkConfig docstring)
- meshai/notifications/channels.py (create_channel_from_sink docstring)
- meshai/scripts/migrate_config_routing.py (module docstring + argparse)
- meshai/dashboard/api/notification_routes.py (endpoint comments)
- tests/test_sinks.py (module docstring)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

meshai/config.py

@@ -503,8 +503,8 @@ class EnvironmentalConfig:
 class SinkConfig:
     """Named notification sink — transport defined once, referenced by name.
 
-    Phase A of routing revamp: transports defined once in sinks block,
-    referenced by name in toggles/rules (Phase B).
+    Routing simplification: transports defined once in sinks block,
+    referenced by name in toggles/rules. See docs/routing-simplification.md.
     """
 
     type: str = "mesh_broadcast"  # mesh_broadcast|mesh_dm|email|webhook

meshai/dashboard/api/notification_routes.py

@@ -311,7 +311,7 @@ async def send_rule_live(request: Request, rule_index: int):
 
 
 # =============================================================================
-# SINKS ENDPOINTS (Phase A of routing revamp)
+# SINKS ENDPOINTS (routing simplification)
 # =============================================================================
 
 @router.get("/sinks")
@@ -319,7 +319,7 @@ async def get_sinks(request: Request):
     """Get configured notification sinks.
 
     Returns list of named sinks with their type and config.
-    Phase A: read-only list; Phase B adds edit endpoints.
+    Read-only list for now; edit endpoints added later.
     """
     config = getattr(request.app.state, "config", None)
     if not config or not hasattr(config, "notifications"):

meshai/notifications/channels.py

@@ -841,7 +841,7 @@ def create_channel_from_dict(config: dict, connector=None) -> NotificationChanne
 def create_channel_from_sink(sink: "SinkConfig", connector=None) -> NotificationChannel:
     """Create a channel instance from a SinkConfig dataclass.
 
-    Phase A of routing revamp: sinks are named transports defined once,
+    Routing simplification: sinks are named transports defined once,
     this factory creates the channel instance for delivery.
 
     Args:

meshai/scripts/migrate_config_routing.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""Migration script for MeshAI routing revamp Phase A: synthesize sinks.
+"""Migration script for MeshAI routing simplification: synthesize sinks.
 
 This script reads existing notification toggles and rules, extracts their
 inline transport configurations, and synthesizes named sinks.
@@ -12,7 +12,7 @@ The migration:
 3. For each enabled rule with inline transport config, synthesizes a named sink
 4. Deduplicates identical transports into one sink
 5. Writes the sinks block to the config
-6. Does NOT remove inline fields (Phase B does that)
+6. Does NOT remove inline fields (done in a later step)
 
 Idempotent: refuses to run if a sinks block already exists.
 """
@@ -287,7 +287,7 @@ def write_sinks_to_config(config_path: Path, sinks: dict):
 
 def main():
     parser = argparse.ArgumentParser(
-        description="Migrate MeshAI config to use named sinks (Phase A)"
+        description="Migrate MeshAI config to use named sinks"
     )
     parser.add_argument(
         "--config",

tests/test_sinks.py

@@ -1,4 +1,4 @@
-"""Tests for Phase A routing revamp: SinkConfig and sink utilities.
+"""Tests for routing simplification: SinkConfig and sink utilities.
 
 Tests cover:
 1. SinkConfig dataclass conversion from dict