Expose dynamic compile failures

etc/uce/settings.cfg

@@ -37,6 +37,16 @@ SITE_DIRECTORY=site
 # ENABLE JIT COMPILATION WHEN A PAGE REQUEST HITS A STALE OR MISSING UNIT
 JIT_COMPILE_ON_REQUEST=1
 
+# SHOW THE BOUNDED COMPILER DIAGNOSTIC WHEN DYNAMIC DISPATCH TARGETS A UNIT
+# THAT FAILED TO COMPILE. WHEN DISABLED, THE CALL REPORTS THE GENERIC MISSING
+# COMPONENT OR UNIT ERROR.
+SHOW_DYNAMIC_COMPILE_ERRORS=1
+
+# KEEP SERVING A COMPATIBLE LAST-KNOWN-GOOD ARTIFACT TO HTTP READ REQUESTS
+# WHILE THE PROACTIVE COMPILER BUILDS A CHANGED UNIT. MUTATIONS AND CLI NEVER
+# SERVE STALE CODE. REQUIRES THE PROACTIVE COMPILER AND DEFAULTS FAIL-CLOSED.
+SERVE_LAST_KNOWN_GOOD=0
+
 # WASM SIDE-MODULE COMPILER USED FOR .uce UNITS
 WASM_COMPILE_SCRIPT=scripts/compile_wasm_unit