fix(capy-install): verify Bun 1.4.4 archives so a 1.4.4 project pin installs instead of RUNTIME_PIN_CONFLICT

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -1,6 +1,13 @@
 # Changelog
 
-## [1.91.179.0] - 2026-10-22
+## [Unreleased]
+
+**gstack installs on a project that pins Bun 1.4.4 again.** gbrain master moved its CI to Bun 1.4.4 (gbrain #7374, the Brotli CVE-2026-111497 fix), and gstack's Capy installer then stopped every gbrain session with `RUNTIME_PIN_CONFLICT` ("verified archives: 1.4.2 1.4.3 … pins exactly 1.4.4"), because it installs only Bun archives whose SHA-256 it carries. It now carries 1.4.4, so the same run installs the pinned Bun and ends `gstack: ok`.
+
+### Fixed
+- **`bin/gstack-bun-version.sh`**: `GSTACK_BUN_VERIFIED` is now 1.4.2 1.4.3 1.4.4, with 1.4.4's checksums for linux-x64, linux-x64-baseline and linux-aarch64, the targets 1.4.3 covers. They come from the release's `SHASUMS256.txt.asc`, whose clearsigned signature verifies against Bun's release key F3DCC08A8572C0749B3E18888EAB4D40A7B22B59 (Robobun, the key oven-sh/bun's own Dockerfiles assert), and each archive was downloaded and hashed to the same value. The 1.4.2 and 1.4.3 entries are unchanged and verify the same way. gstack's own minimum (1.4.2), install default (1.4.3) and CI pins do not move.
+- **`test/gstack-capy-install.test.ts`**: a gbrain-like repo whose CI pins only 1.4.4 refuses `~/.bun` 1.4.3 and installs the 1.4.4 archive. **`test/bun-version-drift.test.ts`**: every verified version must carry a checksum for each installer target. The existing "verified archives" text assertions list 1.4.4.
+
 
 **docsync-fault-interface fits its budgets under load again.** On 2026-10-18 it timed out under load on a Ubicloud full run. Its nested 36-case suite spent most of its time starting processes: each fault actor spawn loaded about 36 ms of imports (an empty bun takes 5.5 ms), inspect repeated Git reads, and the whole nested run sat under one 120 s outer test. With real Git on 4 cores, inner cases now take a 0.70 s median (max 1.25 s) unloaded, against 1.07 s before. Under 8 busy loops the max is 3.44 s, inside bun's default 5 s; before, cases reached 4.45 s. The worst outer test went from about 100 s of its 120 s cap to 33 s. No timeout, budget, retry, assertion or case changed.
 

bin/gstack-bun-version.sh

@@ -28,7 +28,7 @@ GSTACK_BUN_DEFAULT="1.4.3"
 # test/bun-version-drift.test.ts keeps the $GSTACK_BUN_TESTED rows equal). A
 # newer version is listed so the installer can follow a project's exact pin
 # above the minimum. Prints nothing and returns 1 without a verified archive.
-GSTACK_BUN_VERIFIED="1.4.2 1.4.3"
+GSTACK_BUN_VERIFIED="1.4.2 1.4.3 1.4.4"
 gstack_bun_archive_sha256() {
   case "${2:-$GSTACK_BUN_TESTED}" in
     1.4.2) case "$1" in
@@ -43,6 +43,12 @@ gstack_bun_archive_sha256() {
       linux-aarch64) echo efa9813da5ed72423bf847f916e8d2c47c0d776add972354026a75e10da9aa21 ;;
       *) return 1 ;;
     esac ;;
+    1.4.4) case "$1" in
+      linux-x64) echo bf8ccbfb2b0b80159e0f9a6d15c55317add8077534dbc6130a3edb52fccb395c ;;
+      linux-x64-baseline) echo e0446eb55995772eb9894bebae9a6be368d985a8b9271ee124486f9946eedd76 ;;
+      linux-aarch64) echo baa6bb36f51d6e58561e02bbea825038a9df454f673d6d776e8bbf86f8c7850e ;;
+      *) return 1 ;;
+    esac ;;
     *) return 1 ;;
   esac
 }

docs/capy-install.md

@@ -158,7 +158,7 @@ session holds no lease) and a reclaim keeps the lease. `bin/gstack-lease list` s
    repaired without a window (its files are renamed over their predecessors),
    and `~/.bun/bin` is never written. The archive is the project's non-CI
    exact pin when gstack carries a verified archive for it
-   (`GSTACK_BUN_VERIFIED`: 1.4.2, 1.4.3); with only CI exact pins, the install
+   (`GSTACK_BUN_VERIFIED`: 1.4.2, 1.4.3, 1.4.4); with only CI exact pins, the install
    default when it is one of them, else the highest verified one; else the
    install default `GSTACK_BUN_DEFAULT` (1.4.3, above the 1.4.2 minimum; one
    CI job runs the quick free tier on it).

test/bun-version-drift.test.ts

@@ -124,6 +124,13 @@ describe('install default Bun (A2, A-g)', () => {
     expect(verified).toContain(tested);
     expect(Bun.semver.order(installDefault, tested)).toBeGreaterThanOrEqual(0);
   });
+  test('every verified version has a SHA-256 for each target the Capy installer downloads', () => {
+    for (const version of verified) {
+      const r = spawnSync('bash', ['-c', `. "${path.join(ROOT, 'bin', 'gstack-bun-version.sh')}" && for t in linux-x64 linux-x64-baseline linux-aarch64; do gstack_bun_archive_sha256 "$t" "$1" || exit 1; done`, 'bash', version], { encoding: 'utf-8', timeout: 10_000 });
+      expect(r.status, `Bun ${version}: ${r.stderr}`).toBe(0);
+      expect(r.stdout.trim().split('\n').filter(line => /^[0-9a-f]{64}$/.test(line)), `Bun ${version}`).toHaveLength(3);
+    }
+  });
   test('one CI job runs the quick free tier on GSTACK_BUN_DEFAULT, and the free-tests aggregate requires it', () => {
     const onDefault = collectPins().filter(p => p.job === DEFAULT_BUN_JOB);
     expect(onDefault.map(p => p.version)).toEqual([installDefault]);

test/gstack-capy-install.test.ts

@@ -202,7 +202,7 @@ describe('gstack-capy-install', () => {
     const unverified = run(g, ['--project', project]);
     expect(unverified.status).toBe(3);
     expect(unverified.stderr).toContain(`${project}/.bun-version pins exactly 1.4.9`);
-    expect(unverified.stderr).toContain('verified archives: 1.4.2 1.4.3');
+    expect(unverified.stderr).toContain('verified archives: 1.4.2 1.4.3 1.4.4');
     expect(unverified.stderr).toContain('(RUNTIME_PIN_CONFLICT; ');
     expect(g.calls().some(l => l.startsWith('curl ') || l.startsWith('setup '))).toBe(false);
   });
@@ -512,6 +512,19 @@ describe.skipIf(process.platform !== 'linux')('gstack-capy-install: one resoluti
     expect(gr.stdout).toContain(`bun 1.4.3 at ${store(g, '1.4.3')}/bun (the project's exact pin`);
   });
 
+  test('GSTA-64: a gbrain-like repo whose CI pins only 1.4.4 refuses ~/.bun 1.4.3 and installs the verified 1.4.4 archive instead of stopping with RUNTIME_PIN_CONFLICT', () => {
+    const f = fixture({ bun: '1.3.14' });
+    withPins(f);
+    realBun(path.join(f.home, '.bun/bin/bun'), '1.4.3');
+    const project = ciProject(f, 'gbrain', '1.4.4');
+    const r = run(f, ['--for', 'review'], { STUB_CURL_ZIP: zipFor(f, '1.4.4') }, project);
+    expect(r.status, r.stdout + r.stderr).toBe(0);
+    expect(r.stderr).not.toContain('RUNTIME_PIN_CONFLICT');
+    expect(r.stdout).toContain(`judged: bun 1.4.3 at ${f.home}/.bun/bin/bun (BUN_INSTALL)`);
+    expect(f.calls().filter(l => l.startsWith('curl '))).toEqual([expect.stringContaining('https://github.com/oven-sh/bun/releases/download/bun-v1.4.4/bun-linux')]);
+    expect(r.stdout).toContain(`bun 1.4.4 at ${store(f, '1.4.4')}/bun (the project's exact pin`);
+  });
+
   test('no installed Bun satisfies the pins: the line names the Bun actually judged, the exact pin is published in the store, and the next --check agrees', () => {
     const f = fixture({ bun: '1.3.14' });
     withPins(f);
@@ -604,7 +617,7 @@ describe.skipIf(process.platform !== 'linux')('gstack-capy-install: one resoluti
     const f = fixture({ bun: '1.3.14' });
     const bad = run(f, [], { GSTACK_BUN_INSTALL_VERSION: '1.4.9' });
     expect(bad.status).toBe(3);
-    expect(bad.stderr).toContain('GSTACK_BUN_INSTALL_VERSION=1.4.9 is not a verified Bun at or above gstack\'s supported minimum 1.4.2 (verified archives: 1.4.2 1.4.3)');
+    expect(bad.stderr).toContain('GSTACK_BUN_INSTALL_VERSION=1.4.9 is not a verified Bun at or above gstack\'s supported minimum 1.4.2 (verified archives: 1.4.2 1.4.3 1.4.4)');
     expect(bad.stderr).toContain('(BUN_INSTALL_VERSION_INVALID; https://github.com/garrytan/gstack/blob/main/docs/troubleshooting.md#bun-install-version-invalid)');
     expect(f.calls().some(l => l.startsWith('curl ') || l.startsWith('setup '))).toBe(false);
     const r = run(f, ['--for', 'autoplan'], { GSTACK_BUN_INSTALL_VERSION: '1.4.2', STUB_CURL_ZIP: zipFor(f, '1.4.2') });

test/gstack-doctor.test.ts

@@ -630,7 +630,7 @@ describe('gstack-doctor --check', () => {
     const wrapper = '/drive/skills/gstack/scripts/install.sh';
     const capy = row(f, ['--project', project], { STUB_BUN_VERSION: '1.3.14', GSTACK_CAPY_WRAPPER_PATH: wrapper });
     expect(capy.rows.pins.status).toBe('FAIL');
-    expect(capy.rows.pins.rest).toContain(`fix: bash ${wrapper} (installs the project's pinned Bun when it is a verified version: 1.4.2 1.4.3; otherwise it names the conflict), or change the pin in ${project}`);
+    expect(capy.rows.pins.rest).toContain(`fix: bash ${wrapper} (installs the project's pinned Bun when it is a verified version: 1.4.2 1.4.3 1.4.4; otherwise it names the conflict), or change the pin in ${project}`);
     expect(capy.rows.pins.rest).toContain('(PROJECT_PIN_MISMATCH; ');
     const forSkill = row(f, ['--project', project, '--for', 'review'], { STUB_BUN_VERSION: '1.3.14', GSTACK_CAPY_WRAPPER_PATH: wrapper });
     expect(forSkill.rows.pins.rest).toContain(`fix: bash ${wrapper} --for review (installs`);