agentic-sx Phase 3: trace — console output as attached CID objects (TDD)

Per-agent buffer = persist append-only log stream + kv drain cursor;
commit-with-trace! drains everything-since-last-commit into a console-trace
object and binds it git-note style (ref notes/trace/<commit-cid> -> trace
cid). Trace never enters the commit tree; binding is a re-bindable ref layer
over immutable objects; failed commits keep the buffer; plain commit! leaves
binding to the agent. 35/35 (153/153 total).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/agentic/conformance.sh

@@ -13,7 +13,7 @@ if [ ! -x "$SX_SERVER" ]; then
   exit 1
 fi
 
-SUITES=(schema branch)
+SUITES=(schema branch trace)
 
 OUT_JSON="lib/agentic/scoreboard.json"
 OUT_MD="lib/agentic/scoreboard.md"