fix(config): treat a blank analyzer override as absent beside an existing Ghidra project (#7923)

REA_GHIDRA_DISABLED_ANALYZERS parses a blank or comma-only value to no override, but the existing-project conflict check tested the raw value. MCP startup exited and doctor reported config_drift for an input that selects nothing. The check now uses the parsed value.

Fixes #7422

src/config/environment.ts

@@ -236,7 +236,13 @@ export const parseEnvironment = (
           "REA_GHIDRA_SEED_FILE",
           "REA_GHIDRA_DISABLED_ANALYZERS",
           "REA_GHIDRA_NATIVEAOT_JAR",
-        ].filter((setting) => environment[setting] !== undefined);
+        ].filter(
+          (setting) =>
+            // Blank analyzer lists parse to no override, so they cannot conflict.
+            (setting === "REA_GHIDRA_DISABLED_ANALYZERS"
+              ? env[setting]
+              : environment[setting]) !== undefined,
+        );
   if (incompatible.length > 0)
     return err(
       new ConfigurationError("Invalid existing Ghidra project configuration", {

tests/boundary/providers/ghidra/ghidraProjectSnapshot.test.ts

@@ -114,6 +114,22 @@ it("parses an opt-in project once for shared CLI/MCP configuration and rejects i
   );
 });
 
+it("accepts a blank analyzer override beside an existing project and rejects a named one", () => {
+  const environment = {
+    REA_GHIDRA_PROJECT_PATH: join(process.cwd(), "existing.gpr"),
+  };
+  for (const blank of ["", " ", ", ,"])
+    expect(
+      parseConfig({ ...environment, REA_GHIDRA_DISABLED_ANALYZERS: blank }).ok,
+    ).toBe(true);
+  expect(
+    parseConfig({
+      ...environment,
+      REA_GHIDRA_DISABLED_ANALYZERS: "Decompiler Parameter ID",
+    }).ok,
+  ).toBe(false);
+});
+
 it("reports an invalid derived program name at its selection boundary", async () => {
   const { source } = await fixture();
   await expect(