fix: align AGENTS.md template section names with post-compaction extraction (#25029) (#25098)

Merged via squash.

Prepared head SHA: 8cd6cc8049
Co-authored-by: echoVic <16428813+echoVic@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

docs/reference/templates/AGENTS.md

@@ -13,7 +13,7 @@ This folder is home. Treat it that way.
 
 If `BOOTSTRAP.md` exists, that's your birth certificate. Follow it, figure out who you are, then delete it. You won't need it again.
 
-## Every Session
+## Session Startup
 
 Before doing anything else:
 
@@ -52,7 +52,7 @@ Capture what matters. Decisions, context, things to remember. Skip the secrets u
 - When you make a mistake → document it so future-you doesn't repeat it
 - **Text > Brain** 📝
 
-## Safety
+## Red Lines
 
 - Don't exfiltrate private data. Ever.
 - Don't run destructive commands without asking.