fix(lib.sh): load_state_json strict treats a missing DB table as unreadable (Issue #71)

A DB without its sessions table (or without both tables) was read as an
empty registry in strict mode, so stop closed a registered session
row-less and exited 0. Strict mode now fails on any OperationalError;
the non-strict reader is unchanged.

Refs #71

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib.sh

@@ -1592,8 +1592,8 @@ herdr() {
 # NOTE: Retained as small inline PYEOF block (39 lines) per Plan Rev.2 (Job 98393a97).
 # Small blocks have minimal overhead and high local cohesion; extraction into lib_py is reserved for large blocks (>200 lines).
 # `load_state_json strict` (Issue #71) fails (stderr, exit 1) when the YAML or
-# DB cannot be read, instead of printing {} - for a caller that acts on a
-# session being absent.
+# DB cannot be read, a DB table missing included, instead of printing {} - for
+# a caller that acts on a session being absent.
 load_state_json() {
   env_python "$AGENT_SESSIONS_YAML" "MAM_STATE_READ=${1:-}" <<'PYEOF'
 import os, sys, sqlite3, json, yaml
@@ -1610,16 +1610,16 @@ try:
             row = conn.execute('SELECT data FROM state WHERE id=1').fetchone()
             if row:
                 d = json.loads(row[0])
-        except sqlite3.OperationalError as e:
-            if strict and 'no such table' not in str(e):
+        except sqlite3.OperationalError:
+            if strict:
                 raise
         try:
             cursor = conn.execute('SELECT data FROM sessions')
             for r in cursor.fetchall():
                 db_sessions.append(json.loads(r[0]))
             d['herdr_sessions'] = db_sessions
-        except sqlite3.OperationalError as e:
-            if strict and 'no such table' not in str(e):
+        except sqlite3.OperationalError:
+            if strict:
                 raise
         conn.close()
     elif os.path.exists(yaml_path):