feat(01-06): remove matrix reaction-era adapter UX

- Drop reaction-based skill and confirmation helpers from Matrix conversion
- Render !settings as a strict read-only dashboard snapshot
- Align Matrix adapter regressions with command-only helper text

adapter/matrix/converter.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 from typing import Any
 
-from adapter.matrix.reactions import CANCEL_REACTION, CONFIRM_REACTION, reaction_to_skill_index
 from core.protocol import (
     Attachment,
     IncomingCallback,
@@ -95,43 +94,6 @@ def from_command(body: str, sender: str, chat_id: str, room_id: str | None = Non
     )
 
 
-def from_reaction(event: Any, sender: str, chat_id: str) -> IncomingCallback | None:
-    content = getattr(event, "content", {}) or {}
-    relates_to = content.get("m.relates_to", {})
-    key = getattr(event, "key", None) or relates_to.get("key")
-    event_id = getattr(event, "event_id", None) or relates_to.get("event_id")
-    if not key:
-        return None
-
-    if key == CONFIRM_REACTION:
-        return IncomingCallback(
-            user_id=sender,
-            platform=PLATFORM,
-            chat_id=chat_id,
-            action="confirm",
-            payload={"event_id": event_id, "reaction": key},
-        )
-    if key == CANCEL_REACTION:
-        return IncomingCallback(
-            user_id=sender,
-            platform=PLATFORM,
-            chat_id=chat_id,
-            action="cancel",
-            payload={"event_id": event_id, "reaction": key},
-        )
-
-    skill_index = reaction_to_skill_index(key)
-    if skill_index is not None:
-        return IncomingCallback(
-            user_id=sender,
-            platform=PLATFORM,
-            chat_id=chat_id,
-            action="toggle_skill",
-            payload={"event_id": event_id, "reaction": key, "skill_index": skill_index},
-        )
-    return None
-
-
 def from_room_event(event: Any, room_id: str, chat_id: str) -> IncomingEvent | None:
     body = (getattr(event, "body", None) or "").strip()
     sender = getattr(event, "sender", "")