Address bneradt's review: wire SESSION_VARS into kg and LSP

kg_visitor.py was missing sessionVarSection dispatch in visitSection,
causing hrw4u-kg to silently drop SESSION_VARS blocks. lsp/strings.py
only detected VARS { ... } for declaration mode, leaving session-scoped
variables without hover/type metadata in hrw4u-lsp.

Author: zwoop

tools/hrw4u/src/kg_visitor.py

@@ -242,6 +242,8 @@ def visitSection(self, ctx) -> None:
         with self.debug_context("visitSection"):
             if ctx.varSection():
                 return self.visitVarSection(ctx.varSection())
+            if ctx.sessionVarSection():
+                return self.visitSessionVarSection(ctx.sessionVarSection())
 
             if ctx.name is None:
                 return
@@ -294,6 +296,25 @@ def visitVarSection(self, ctx) -> None:
 
             self.current_section_id = old_section_id
 
+    def visitSessionVarSection(self, ctx) -> None:
+        with self.debug_context("visitSessionVarSection"):
+            vars_section_id = self._add_node(
+                "VarSection", {
+                    "scope": "session",
+                    "line_start": ctx.start.line if ctx.start else None,
+                    "line_end": ctx.stop.line if ctx.stop else None
+                }, f"{self.filename}:SESSION_VARS")
+
+            if self.current_file_id:
+                self._add_edge(self.current_file_id, vars_section_id, "CONTAINS")
+
+            old_section_id = self.current_section_id
+            self.current_section_id = vars_section_id
+
+            self.visit(ctx.variables())
+
+            self.current_section_id = old_section_id
+
     def visitVariableDecl(self, ctx) -> None:
         with self.debug_context("visitVariableDecl"):
             if ctx.name is None or ctx.typeName is None:

tools/hrw4u/src/lsp/strings.py

@@ -212,8 +212,9 @@ def parse_variable_declarations(text: str) -> Dict[str, VariableDeclaration]:
             if not stripped or stripped.startswith('//') or stripped.startswith('#'):
                 continue
 
-            # Check for VARS section start
-            if stripped == 'VARS {' or stripped.startswith('VARS {'):
+            # Check for VARS or SESSION_VARS section start
+            if stripped == 'VARS {' or stripped.startswith('VARS {') or \
+               stripped == 'SESSION_VARS {' or stripped.startswith('SESSION_VARS {'):
                 in_vars_section = True
                 brace_count = 1
                 continue

tools/hrw4u/tests/test_coverage.py

@@ -366,14 +366,14 @@ def test_rewrite_inline_fallback_quoted(self):
 
     def test_get_var_declarations_empty(self):
         r = self._resolver()
-        assert r.get_var_declarations() == []
+        assert r.get_var_declarations() == ([], [])
 
     def test_get_var_declarations_after_state_tag(self):
         r = self._resolver()
         r._handle_state_tag("STATE-FLAG", "0")
-        decls = r.get_var_declarations()
-        assert len(decls) == 1
-        assert "bool" in decls[0]
+        txn_decls, ssn_decls = r.get_var_declarations()
+        assert len(txn_decls) == 1
+        assert "bool" in txn_decls[0]
 
     def test_percent_to_ident_invalid(self):
         r = self._resolver()