chore: zero-heads warning names the benign cause too; digest path declaration made load-bearing; ratchet re-capture

- The ls-remote zero-heads warning no longer accuses an empty remote of
  running a laundering shim.
- instructionTier.rulesFile now must equal the generator's DIGEST_RELPATH
  (and setup must print it) — the declaration fails with the real path
  instead of lying silently.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

bin/gstack-next-version

@@ -550,7 +550,7 @@ function fetchGitClaimed(
     // `upstream` remote's branches are not claims against OUR queue).
     warnings.push(
       lsOk
-        ? "git ls-remote origin exited 0 but advertised zero heads (exit-code-laundering shim suspected); " +
+        ? "git ls-remote origin exited 0 but advertised zero heads (an empty remote, or an exit-code-laundering git shim); " +
           "using stale local refs/remotes/origin — branches deleted on the remote may still be counted as claims (run `git fetch --prune origin` to refresh)"
         : "git ls-remote origin failed; using stale local refs/remotes/origin — " +
           "branches deleted on the remote may still be counted as claims (run `git fetch --prune origin` to refresh)",

test/agents-digest.test.ts

@@ -97,10 +97,16 @@ describe('agents-digest', () => {
     }
   });
 
-  test('instruction-tier hosts declare the digest in host config', () => {
+  test('instruction-tier hosts declare the digest in host config — and the declaration tracks the real path', () => {
+    // This is what makes instructionTier.rulesFile load-bearing instead of
+    // config nobody reads: the declared string must equal the generator's
+    // DIGEST_RELPATH, and setup's explainer must print that same path. If
+    // the digest ever moves, all three surfaces fail together.
+    const setup = fs.readFileSync(path.join(ROOT, 'setup'), 'utf-8');
+    expect(setup).toContain(DIGEST_RELPATH);
     for (const host of ['openclaw', 'hermes']) {
       const src = fs.readFileSync(path.join(ROOT, 'hosts', `${host}.ts`), 'utf-8');
-      expect(src).toContain("instructionTier: { rulesFile: 'agents-digest/gstack-AGENTS.md' }");
+      expect(src).toContain(`instructionTier: { rulesFile: '${DIGEST_RELPATH}' }`);
     }
   });
 });

test/fixtures/context-budget.json

@@ -2,7 +2,7 @@
   "_comment": "Context-budget ratchet ceilings (~tokens). Regenerate: bun test/helpers/capture-context-budget.ts. Headroom: alwaysOnTotal x1.05, eagerPerInvocation x1.1. Graded by test/context-budget-ratchet.test.ts via lib/context-bill.ts checkBudget.",
   "alwaysOnTotal": 6344,
   "eagerPerInvocation": {
-    "autoplan": 16208,
+    "autoplan": 16321,
     "benchmark": 4931,
     "benchmark-models": 3829,
     "browse": 7097,
@@ -56,7 +56,7 @@
     "setup-browser-cookies": 3194,
     "setup-deploy": 10646,
     "setup-gbrain": 15251,
-    "ship": 19664,
+    "ship": 19751,
     "skillify": 11889,
     "spec": 14385,
     "sync-gbrain": 13672,