mod: Phase 3 — lifecycle state machine + escalation + appeal, 106/106

Pure SX state machine (lib/mod/lifecycle.sx) over the engine:
open→triaged→decided→appealed→final, transition table guards illegal moves.
Auto-tier resolves terminal actions; escalate parks at human-tier (resolve
blocked until review supplies evidence). Appeal re-runs the engine — new
exonerated-keep rule at top precedence lets exoneration override a prior hide.
Api façade (mod/triage/resolve/review/appeal/finalize) over a case registry,
logging committed decisions to the audit trail. +46 escalation tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/mod/scoreboard.json

@@ -1,11 +1,12 @@
 {
   "lang": "mod",
-  "total_passed": 60,
+  "total_passed": 106,
   "total_failed": 0,
-  "total": 60,
+  "total": 106,
   "suites": [
     {"name":"decide","passed":31,"failed":0,"total":31},
-    {"name":"audit","passed":29,"failed":0,"total":29}
+    {"name":"audit","passed":29,"failed":0,"total":29},
+    {"name":"escalation","passed":46,"failed":0,"total":46}
   ],
-  "generated": "2026-06-06T17:36:32+00:00"
+  "generated": "2026-06-06T17:49:32+00:00"
 }