CB-559: drop .claude/settings.local.json from the default parity overlay

bridged/src/main/java/dev/ltms/bridged/config/BridgedConfig.java

@@ -210,8 +210,14 @@ public record BridgedConfig(
             // worker the primary's IDE servers, which are bound to the primary's checkout — so its
             // navigation returned paths outside its own worktree. GitWorktrees now neutralizes that
             // file instead; a worker's tools are whatever its launcher mounts.
+            // .claude/settings.local.json is the sibling that was left behind: it pre-approves tools
+            // (mcp__context7__*, mcp__jetbrains, mcp__intellij-index, Workflow(code-review)) a worker
+            // must never hold, and enables MCP servers by name. Its grants are currently INERT because
+            // GitWorktrees.isolateToolSurface strips every worktree's server map to empty — the named
+            // servers do not exist there to be enabled. This is defence in depth, not a live fix: the
+            // worker stays isolated only because this separate mechanism already removes the servers.
             parityOverlay = (parityOverlay == null || parityOverlay.isEmpty())
-                    ? List.of(".claude/settings.local.json", ".env", ".envrc")
+                    ? List.of(".env", ".envrc")
                     : List.copyOf(parityOverlay);
             // gitTokenEnv stays null when unset (opt-in). gitHostEnv defaults so operators enabling
             // checkpoints need only set gitTokenEnv; it is injected only alongside a resolved token.

bridged/src/test/java/dev/ltms/bridged/config/BridgedConfigTest.java

@@ -1167,6 +1167,41 @@ class BridgedConfigTest {
                 "a profile without the key stays off-subscription (the default)");
     }
 
+    @Test
+    void parityOverlayDefaultsToEnvFilesOnly(@TempDir Path dir) throws Exception {
+        Path f = dir.resolve("no-overlay.yaml");
+        Files.writeString(f, """
+                bind:
+                  port: 8080
+                profiles:
+                  gx10:
+                    baseUrl: http://gx10.gw:8000
+                """);
+
+        BridgedConfig cfg = BridgedConfig.load(f);
+        assertEquals(List.of(".env", ".envrc"),
+                cfg.profiles().get("gx10").parityOverlay(),
+                "the default parity overlay is the env files; settings.local.json is no longer copied by default");
+    }
+
+    @Test
+    void parityOverlayExplicitListIsPreservedVerbatim(@TempDir Path dir) throws Exception {
+        Path f = dir.resolve("explicit-overlay.yaml");
+        Files.writeString(f, """
+                bind:
+                  port: 8080
+                profiles:
+                  gx10:
+                    baseUrl: http://gx10.gw:8000
+                    parityOverlay: [".claude/settings.local.json", ".env"]
+                """);
+
+        BridgedConfig cfg = BridgedConfig.load(f);
+        assertEquals(List.of(".claude/settings.local.json", ".env"),
+                cfg.profiles().get("gx10").parityOverlay(),
+                "an operator's explicit list survives verbatim — the default only changes when unset");
+    }
+
     // ── CB-542: subscription:true must not smuggle an unguarded endpoint via env: ───────────────
 
     @Test

bridged/src/test/java/dev/ltms/bridged/session/WorktreeSessionManagerTest.java

@@ -94,12 +94,12 @@ class WorktreeSessionManagerTest {
         FakeWorktrees.OverlayCall overlay = worktrees.lastOverlay();
         assertNotNull(overlay);
         assertEquals("/repo", overlay.repoRoot());
-        assertEquals(List.of(".claude/settings.local.json", ".env", ".envrc"),
+        assertEquals(List.of(".env", ".envrc"),
                 overlay.requested(), "default parity overlay is used when unset");
         assertFalse(overlay.requested().contains(".mcp.json"),
                 "CB-525: replicating the primary's MCP config gives a worker the primary's IDE "
                         + "servers, which navigate its edits out of its own worktree");
-        assertEquals(List.of(".claude/settings.local.json", ".envrc"), overlay.copied(),
+        assertEquals(List.of(".envrc"), overlay.copied(),
                 "existing paths are copied; missing paths are skipped");
         assertEquals(List.of(".envrc"), overlay.skipWorktree(),
                 "tracked copied paths are --skip-worktree'd");