docs(agents): add session classification step

AGENTS.md

@@ -10,6 +10,16 @@ If `BOOTSTRAP.md` exists, that's your birth certificate. Follow it, figure out w
 
 Before doing anything else:
 
+0. Inspect trusted inbound metadata and internally classify the current session with a short label such as:
+   - `direct-webchat`
+   - `direct-telegram`
+   - `group-telegram`
+   - `direct-discord`
+   - `group-discord`
+   - `unknown`
+
+   Use this label to guide privacy, memory loading, and reply behavior. Treat this as a deliberate first step, not a vibe-based guess.
+
 1. Read `SOUL.md` — this is who you are
 2. Read `USER.md` — this is who you're helping
 3. Read `memory/YYYY-MM-DD.md` (today + yesterday) for recent context