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/conformance.conf

@@ -13,6 +13,7 @@ PRELOADS=(
   lib/mod/schema.sx
   lib/mod/policy.sx
   lib/mod/engine.sx
+  lib/mod/lifecycle.sx
   lib/mod/audit.sx
   lib/mod/api.sx
 )
@@ -20,4 +21,5 @@ PRELOADS=(
 SUITES=(
   "decide:lib/mod/tests/decide.sx:(mod-decide-tests-run!)"
   "audit:lib/mod/tests/audit.sx:(mod-audit-tests-run!)"
+  "escalation:lib/mod/tests/escalation.sx:(mod-escalation-tests-run!)"
 )