perf(reference_picker): improve reference_picker by incremental parsing

Author: sudo-tee

.claude/settings.local.json

@@ -0,0 +1,14 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(nvim --headless -u tests/minimal_init.lua -c \"lua require\\(''''plenary.test_harness''''\\).test_directory\\(''''tests/unit/reference_picker_spec.lua'''', {minimal_init=''''tests/minimal_init.lua''''}\\)\")",
+      "Bash(nvim --headless -u tests/minimal_init.lua -c \"PlenaryBustedFile tests/unit/reference_picker_spec.lua\")",
+      "Bash(nvim --version)",
+      "Bash(cat tests/minimal/*.lua)",
+      "Bash(head -5 tests/unit/*.lua)",
+      "Bash(nvim --headless -u tests/minimal/init.lua -c \"lua require\\(''plenary.busted''\\).run\\(''tests/unit/reference_picker_spec.lua''\\)\")",
+      "Bash(echo \"EXIT: $?\")",
+      "Bash(bash run_tests.sh -t tests/unit/reference_picker_spec.lua 2>&1)"
+    ]
+  }
+}