fix: feat(20b): dev-agent reads formula from .profile repo (#85)

lib/formula-session.sh

@@ -78,7 +78,7 @@ resolve_agent_identity() {
 
 # ensure_profile_repo [AGENT_IDENTITY]
 # Clones or pulls the agent's .profile repo to a local cache dir.
-# Requires: FORGE_TOKEN, FORGE_URL, FORGE_REPO (to derive .profile repo slug).
+# Requires: FORGE_TOKEN, FORGE_URL.
 # Exports PROFILE_REPO_PATH (local cache path) and PROFILE_FORMULA_PATH.
 # Returns 0 on success, 1 on failure (falls back gracefully).
 ensure_profile_repo() {
@@ -90,6 +90,7 @@ ensure_profile_repo() {
       log "WARNING: cannot resolve agent identity, skipping .profile repo"
       return 1
     fi
+    agent_identity="$AGENT_IDENTITY"
   fi
 
   # Define cache directory: /home/agent/data/.profile/{agent-name}
@@ -173,7 +174,7 @@ load_formula_or_profile() {
       FORMULA_SOURCE="formulas/"
       return 0
     else
-      log "ERROR: formula not found in .profile and fallback not specified: $fallback_formula"
+      log "ERROR: formula not found in .profile and fallback file not found: $fallback_formula"
       return 1
     fi
   fi