fix(core): load config across git boundaries (#36577)

Co-authored-by: 𝓛𝓲𝓽𝓽𝓵𝓮 𝓕𝓻𝓪𝓷𝓴 <little-frank@opencord.local>
Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>

packages/core/src/config.ts

@@ -200,7 +200,6 @@ const layer = Layer.effect(
             .up({
               targets: [".opencode", ".claude", ".agents", ...names.toReversed()],
               start: location.directory,
-              stop: location.project.directory,
             })
           .pipe(Effect.orDie)
 

packages/core/test/config/config.test.ts

@@ -876,7 +876,7 @@ describe("Config", () => {
     ),
   )
 
-  it.live("loads global, ancestor, and .opencode configuration up to the project boundary", () =>
+  it.live("loads global and ancestor configuration across the project boundary", () =>
     Effect.acquireRelease(
       Effect.promise(() => tmpdir()),
       (tmp) => Effect.promise(() => tmp[Symbol.asyncDispose]()),
@@ -936,6 +936,7 @@ describe("Config", () => {
             ])
             expect(documents.map((document) => document.info.$schema)).toEqual([
               "global",
+              "outside",
               "root",
               "parent",
               "directory",
@@ -951,6 +952,8 @@ describe("Config", () => {
               AbsolutePath.make(path.join(root, ".agents")),
               "global",
               AbsolutePath.make(global),
+              "outside",
+              AbsolutePath.make(path.join(tmp.path, "opencode.json")),
               "root",
               AbsolutePath.make(path.join(root, "opencode.json")),
               "parent",