diff --git a/.buildkite/scripts/product-validation.sh b/.buildkite/scripts/product-validation.sh
index 807c9a5..a3a28e5 100755
--- a/.buildkite/scripts/product-validation.sh
+++ b/.buildkite/scripts/product-validation.sh
@@ -28,7 +28,7 @@ bash .buildkite/scripts/checkpoint-evidence.sh
 repository_id="${TABELLIO_REPO_ID:-}"
 if [[ -z "$repository_id" ]]; then
   repository_url="$(git remote get-url origin)"
-  repository_id="$(node -e 'const u=process.argv[1]; const m=u.match(/^(?:https:\/\/github\.com\/|git@github\.com:)([^/]+\/[^/]+?)(?:\.git)?$/); if(!m)process.exit(1); console.log(m[1]);' "$repository_url")"
+  repository_id="$(node --input-type=module -e 'import { parseGitHubRepositoryRemote } from "./scripts/lib/github-repository.mjs"; const repository = parseGitHubRepositoryRemote(process.argv[1]); if (!repository) process.exit(1); console.log(repository.fullName);' "$repository_url")"
 fi
 [[ "$repository_id" =~ ^[A-Za-z0-9_.-]+/[A-Za-z0-9_.-]+$ ]] || { echo "A valid customer repository ID is required." >&2; exit 1; }
 
diff --git a/scripts/ci-checkpoint-evidence.mjs b/scripts/ci-checkpoint-evidence.mjs
index 92f66d7..1826d11 100644
--- a/scripts/ci-checkpoint-evidence.mjs
+++ b/scripts/ci-checkpoint-evidence.mjs
@@ -28,11 +28,15 @@ try {
     const text = (process.env.TABELLIO_CHECKPOINT_PROOF_1 ?? '') + (process.env.TABELLIO_CHECKPOINT_PROOF_2 ?? '');
     if (!text || text.length > 98000) throw new Error('Missing or oversized evidence.');
     const envelope = JSON.parse(text);
+    // Keep the transport range aligned with the validation gate after main advances.
+    const base = process.env.GITHUB_EVENT_NAME === 'push'
+      ? git('rev-parse', 'HEAD^')
+      : git('merge-base', 'origin/main', 'HEAD');
     if (Object.keys(envelope).sort().join(',') !== 'base,bundle,candidate,nativeTip,repositoryId,schemaVersion,sha256'
       || envelope.schemaVersion !== 'tabellio-private-checkpoint-proof/v1'
       || envelope.repositoryId !== `github.com/${process.env.GITHUB_REPOSITORY}`
       || envelope.candidate !== git('rev-parse', 'HEAD')
-      || envelope.base !== git('merge-base', 'origin/main', 'HEAD')
+      || envelope.base !== base
       || !/^[0-9a-f]{40}$/.test(envelope.nativeTip)) throw new Error('Evidence scope mismatch.');
     const bytes = Buffer.from(envelope.bundle, 'base64');
     if (bytes.toString('base64') !== envelope.bundle || createHash('sha256').update(bytes).digest('hex') !== envelope.sha256) throw new Error('Evidence integrity mismatch.');
diff --git a/tests/buildkite-high-gates.test.mjs b/tests/buildkite-high-gates.test.mjs
index ef400b6..5d5b7d0 100644
--- a/tests/buildkite-high-gates.test.mjs
+++ b/tests/buildkite-high-gates.test.mjs
@@ -140,7 +140,7 @@ test("GitHub merged-head validation remains during Buildkite migration", async (
   const loader = await repositoryFile("scripts/ci-checkpoint-evidence.mjs");
   assert.match(loader, /execFileSync\('bash', \['\.buildkite\/scripts\/checkpoint-evidence\.sh'\]/);
   assert.match(loader, /envelope\.candidate !== git\('rev-parse', 'HEAD'\)/);
-  assert.match(loader, /envelope\.base !== git\('merge-base', 'origin\/main', 'HEAD'\)/);
+  assert.match(loader, /envelope\.base !== base/);
   assert.match(loader, /createHash\('sha256'\)\.update\(bytes\)\.digest\('hex'\) !== envelope\.sha256/);
   assert.doesNotMatch(workflow, /refs\/tabellio\/validations\//);
   assert.doesNotMatch(workflow, /validation-ref\.bundle/);
diff --git a/tests/checkpoint-evidence.test.mjs b/tests/checkpoint-evidence.test.mjs
index 924b43e..f7b2110 100644
--- a/tests/checkpoint-evidence.test.mjs
+++ b/tests/checkpoint-evidence.test.mjs
@@ -117,11 +117,25 @@ test('private runner envelope binds candidate and digest, rejects leaks, and rem
     const loader = resolve('scripts/ci-checkpoint-evidence.mjs');
     const invoke = (command, value = envelope) => {
       const text = JSON.stringify(value); const middle = Math.floor(text.length / 2);
-      return run(target, process.execPath, [loader, command], { GITHUB_ACTIONS: 'true', GITHUB_WORKSPACE: target, RUNNER_TEMP: runner, GITHUB_REPOSITORY: 'Fixture/Transport', TABELLIO_CHECKPOINT_PROOF_1: text.slice(0, middle), TABELLIO_CHECKPOINT_PROOF_2: text.slice(middle) });
+      return run(target, process.execPath, [loader, command], { GITHUB_ACTIONS: 'true', GITHUB_EVENT_NAME: 'pull_request', GITHUB_WORKSPACE: target, RUNNER_TEMP: runner, GITHUB_REPOSITORY: 'Fixture/Transport', TABELLIO_CHECKPOINT_PROOF_1: text.slice(0, middle), TABELLIO_CHECKPOINT_PROOF_2: text.slice(middle) });
     };
     for (const bad of [{ ...envelope, candidate: base }, { ...envelope, sha256: '0'.repeat(64) }, { ...envelope, repositoryId: 'wrong/private-secret-marker' }]) {
       const r = invoke('load', bad); assert.equal(r.status, 1); assert.ok(!r.stderr.includes('private-secret-marker'));
     }
+    // A main push advances origin/main to HEAD; the gate still validates HEAD^..HEAD.
+    git(target, 'update-ref', 'refs/remotes/origin/main', candidate);
+    const invokePush = value => {
+      const text = JSON.stringify(value); const middle = Math.floor(text.length / 2);
+      return run(target, process.execPath, [loader, 'load'], { GITHUB_ACTIONS: 'true', GITHUB_EVENT_NAME: 'push', GITHUB_WORKSPACE: target, RUNNER_TEMP: runner, GITHUB_REPOSITORY: 'Fixture/Transport', TABELLIO_CHECKPOINT_PROOF_1: text.slice(0, middle), TABELLIO_CHECKPOINT_PROOF_2: text.slice(middle) });
+    };
+    assert.equal(invokePush({ ...envelope, base: candidate }).status, 1, 'HEAD is not the prior push base');
+    assert.equal(invokePush({ ...envelope, repositoryId: 'github.com/Wrong/Repository' }).status, 1);
+    assert.equal(invokePush({ ...envelope, candidate: base }).status, 1);
+    assert.equal(invokePush(envelope).status, 0, 'prior-base proof loads after origin/main advances');
+    assert.equal(git(target, 'rev-parse', 'refs/heads/entire/checkpoints/v1'), nativeTip);
+    assert.equal(invoke('cleanup').status, 0);
+    git(target, 'update-ref', 'refs/remotes/origin/main', base);
+    assert.equal(invoke('load', { ...envelope, base: candidate }).status, 1, 'PR proof rejects the wrong base');
     const loaded = invoke('load'); assert.equal(loaded.status, 0, loaded.stderr);
     assert.equal(git(target, 'rev-parse', 'refs/heads/entire/checkpoints/v1'), nativeTip);
     for (const path of ['prompt.txt', 'full.jsonl']) assert.notEqual(run(target, 'git', ['cat-file', '-e', git(source, 'rev-parse', `${nativeTip}:${path}`)]).status, 0);
@@ -135,5 +149,30 @@ test('private runner envelope binds candidate and digest, rejects leaks, and rem
       git(target, 'update-ref', ref, base); assert.equal(invoke('load').status, 1);
       assert.equal(git(target, 'rev-parse', ref), base); git(target, 'update-ref', '-d', ref);
     }
+    git(target, '-c', 'user.name=Fixture', '-c', 'user.email=fixture@example.invalid', 'commit', '--allow-empty', '-m', 'Second PR candidate');
+    const secondCandidate = git(target, 'rev-parse', 'HEAD');
+    assert.equal(git(target, 'rev-parse', 'HEAD^'), candidate);
+    assert.equal(git(target, 'merge-base', 'origin/main', 'HEAD'), base);
+    assert.equal(invoke('load', { ...envelope, candidate: secondCandidate, base: candidate }).status, 1, 'multi-commit PR must reject HEAD^ in place of merge-base');
+    assert.equal(invoke('load', { ...envelope, candidate: secondCandidate }).status, 0, 'multi-commit PR retains its merge-base');
+    assert.equal(invoke('cleanup').status, 0);
+    assert.equal(git(target, 'rev-parse', 'HEAD'), secondCandidate);
   } finally { await rm(root, { recursive: true, force: true }); }
 });
+
+
+test('Buildkite repository extraction uses shared GitHub parser for HTTPS and SSH origins', async () => {
+  const source = await readFile(resolve('.buildkite/scripts/product-validation.sh'), 'utf8');
+  const extraction = source.match(/node --input-type=module -e '([^']+)' "\$repository_url"/);
+  assert.ok(extraction, 'Exercise the registered shell command, not a copy of its parser');
+  for (const remote of ['https://github.com/Fixture/Transport.git', 'git@github.com:Fixture/Transport.git', 'ssh://git@github.com/Fixture/Transport.git']) {
+    const result = run(process.cwd(), process.execPath, ['--input-type=module', '-e', extraction[1], remote]);
+    assert.equal(result.status, 0, result.stderr);
+    assert.equal(result.stdout.trim(), 'Fixture/Transport');
+  }
+  for (const remote of ['ssh://git@example.com/Fixture/Transport.git', 'https://github.com/Fixture/Transport/extra', 'ssh://git@github.com/../Transport.git', 'not-a-repository']) {
+    const result = run(process.cwd(), process.execPath, ['--input-type=module', '-e', extraction[1], remote]);
+    assert.equal(result.status, 1);
+    assert.equal(result.stdout.trim(), '');
+  }
+});