diff --git a/.github/workflows/gate.yml b/.github/workflows/gate.yml
index 0d40cead94..9b9989e5bb 100644
--- a/.github/workflows/gate.yml
+++ b/.github/workflows/gate.yml
@@ -569,6 +569,64 @@ jobs:
           printf '  %s\n' "${files[@]}"
           shellcheck --format=gcc --severity=style "${files[@]}"
 
+  lint-bash-retirement-inventory:
+    # Bash-retirement guard for the TypeScript/Bun migration trajectory:
+    # Zeta-owned post-install repo scripts should not grow new `.sh`
+    # entrypoints after Bucket B reached zero. The retained shell surface is
+    # setup/bootstrap, launchd-bootstrap, and the Kiro loop wrapper only.
+    name: lint (bash retirement inventory)
+    timeout-minutes: 5
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Cache install.sh outputs (mise runtimes + dotnet tools + verifier jars)
+        # Comprehensive cache — see lint-shell job above for the
+        # rationale (maintainer dev-CI parity input +
+        # transient 502 prevention). Same cache key shape so all
+        # lint jobs share the cache when toolchain unchanged.
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+        with:
+          path: |
+            ~/.local/bin/mise
+            ~/.local/share/mise
+            ~/.cache/mise
+            ~/.dotnet/tools
+            ~/.elan
+            ~/.config/zeta
+          key: install-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('.mise.toml', 'tools/setup/**', 'global.json') }}
+
+      - name: Install toolchain via three-way-parity script (GOVERNANCE §24)
+        # Provides bun via mise's pin in .mise.toml. The inventory guard is
+        # intentionally separate from shellcheck: shellcheck validates the
+        # retained setup scripts, while this job fails any new non-allowlisted
+        # tracked `.sh` surface before it reaches main.
+        # See lint-shell job above for retry rationale.
+        run: |
+          set -euo pipefail
+          for attempt in 1 2 3 4 5; do
+            if ./tools/setup/install.sh; then exit 0; fi
+            [ "$attempt" = "5" ] && { echo "install.sh failed after 5 attempts"; exit 1; }
+            # Backoff: 10s, 30s, 60s, 120s — covers transient CDN
+            # blips from short-burst-and-recover up to multi-minute
+            # outages. The retry budget is five attempts because prior
+            # bun CDN 502s exhausted mise-internal retries plus a
+            # three-attempt wrapper.
+            case "$attempt" in
+              1) backoff=10 ;;
+              2) backoff=30 ;;
+              3) backoff=60 ;;
+              4) backoff=120 ;;
+            esac
+            echo "install.sh attempt $attempt failed; retrying in ${backoff}s..." >&2
+            sleep "$backoff"
+          done
+
+      - name: Run bash-retirement inventory guard
+        run: bun run hygiene:check-bash-retirement-inventory
+
   lint-workflows:
     # actionlint catches .github/workflows/*.yml bugs: unknown
     # context refs, invalid runner labels, shellcheck-style warnings
diff --git a/docs/trajectories/typescript-bun-migration/RESUME.md b/docs/trajectories/typescript-bun-migration/RESUME.md
index 4427676ba4..cfa167aa77 100644
--- a/docs/trajectories/typescript-bun-migration/RESUME.md
+++ b/docs/trajectories/typescript-bun-migration/RESUME.md
@@ -1,12 +1,13 @@
 # Trajectory — TypeScript / Bun migration
 
-**Status**: Soak + bash-retirement phase (Lane B slice 21 merged — [#908](https://github.com/Lucent-Financial-Group/Zeta/pull/908); **Bucket B is empty**; retained non-Lean bash surface is setup/bootstrap only)
-**Milestone**: 42 ported. All clusters complete: budget (14/18/19), peer-call (15/16/17), git (13/20), pr-preservation (21). Bucket B is empty as of 2026-04-30T08:07:32Z. The remaining non-Lean `.sh` inventory is guarded by `tools/hygiene/check-bash-retirement-inventory.ts`.
+**Status**: Soak + bash-retirement phase (Lane B slice 21 merged — [#908](https://github.com/Lucent-Financial-Group/Zeta/pull/908); bash-retirement inventory guard landed — [#2764](https://github.com/Lucent-Financial-Group/Zeta/pull/2764); **Bucket B is empty**; retained non-Lean bash surface is setup/bootstrap, launchd-bootstrap, and the Kiro loop wrapper only)
+**Milestone**: 42 ported. All clusters complete: budget (14/18/19), peer-call (15/16/17), git (13/20), pr-preservation (21). Bucket B is empty as of 2026-04-30T08:07:32Z. The remaining non-Lean `.sh` inventory is guarded by `tools/hygiene/check-bash-retirement-inventory.ts` and wired through package script `hygiene:check-bash-retirement-inventory` plus the `gate.yml` bash-retirement inventory lint job.
 **Current blocker**: None.
-**Next concrete action**: Land the bash-retirement inventory check, then wire it
-into the appropriate hygiene/CI surface after one clean soak pass. Do not revive
-the old Cluster G/H/I or budget-cluster port queues.
-**Last updated**: 2026-05-12
+**Next concrete action**: Shepherd the bash-retirement inventory wire-in PR
+through review and CI; after merge, decide whether the bash-retirement phase can
+move from soak to closed-maintained. Do not revive the old Cluster G/H/I or
+budget-cluster port queues.
+**Last updated**: 2026-05-26
 
 ## Why this trajectory exists
 
@@ -32,6 +33,7 @@ Per the maintainer-channel correction via the multi-AI review surface (2026-04-2
 | [#882](https://github.com/Lucent-Financial-Group/Zeta/pull/882) | 2026-04-30 (commit `02266a7`) | `tools/hygiene/validate-agencysignature-pr-body.{sh→ts}`, `tools/hygiene/audit-agencysignature-main-tip.{sh→ts}`, `tools/hygiene/capture-tick-snapshot.{sh→ts}` | Merged |
 | [#883](https://github.com/Lucent-Financial-Group/Zeta/pull/883) | 2026-04-30 (commit `271bc38`) | `tools/hygiene/counterweight-audit.{sh→ts}`, `tools/hygiene/append-tick-history-row.{sh→ts}` | Merged |
 | [#884](https://github.com/Lucent-Financial-Group/Zeta/pull/884) | 2026-04-30 (commit `9237756`) | `tools/skill-catalog/backfill_dv2_frontmatter.{sh→ts}`, `tools/audit-packages.{sh→ts}` | Merged |
+| [#2764](https://github.com/Lucent-Financial-Group/Zeta/pull/2764) | 2026-05-12 (commit `b563ba0`) | `tools/hygiene/check-bash-retirement-inventory.ts`, `tools/hygiene/check-bash-retirement-inventory.test.ts` | Merged |
 
 ## Inventory — Python (tools/, Zeta-authored)
 
@@ -39,22 +41,30 @@ Per the maintainer-channel correction via the multi-AI review surface (2026-04-2
 
 After PR #849, Zeta has zero Python files in `tools/` (Zeta-authored — the 22 `.py` files under `tools/lean4/.lake/packages/mathlib/scripts/` are mathlib upstream, not in scope). Python→TS in `tools/` is **100% complete**.
 
-## Inventory — Bash (tools/, Zeta-authored, 13 retained files)
+## Inventory — Bash (tools/, Zeta-authored, 15 retained files)
 
 Current count is repo-derived and guarded by:
 
 ```bash
 bun tools/hygiene/check-bash-retirement-inventory.ts --enforce
+bun run hygiene:check-bash-retirement-inventory
 ```
 
-The expected retained surface is setup/bootstrap only. Any new non-Lean `.sh`
-outside the allowlist is bash-retirement drift.
+The expected retained surface is setup/bootstrap, launchd-bootstrap, and the
+Kiro loop wrapper only. Any
+new non-Lean `.sh` outside the allowlist is bash-retirement drift.
 
-### Bucket A — Should stay Bash (13 files)
+### Bucket A — Should stay Bash (15 files)
 
-These run **before** Bun is installed (post-install scripts can use Bun; pre-install scripts cannot). Per Otto-235 4-shell portability target (macOS bash 3.2 / Ubuntu / git-bash / WSL), these are the bootstrap layer.
+These either run **before** Bun is installed (post-install scripts can use Bun;
+pre-install scripts cannot) or bootstrap macOS launchd into the pinned Bun
+environment before handing off to TypeScript. Per Otto-235 4-shell portability
+target (macOS bash 3.2 / Ubuntu / git-bash / WSL), these are the bootstrap
+layer.
 
 ```text
+tools/kiro/kiro-loop-wrapper.sh
+tools/kiro/launchd/install.sh
 tools/setup/install.sh
 tools/setup/doctor.sh
 tools/setup/linux.sh
@@ -70,7 +80,9 @@ tools/setup/common/sync-upstreams.sh
 tools/setup/common/verifiers.sh
 ```
 
-Rationale: TS/Bun is itself one of the things `install.sh` installs. These scripts cannot depend on Bun.
+Rationale: TS/Bun is itself one of the things `install.sh` installs, and
+launchd needs a small shell bootstrap to establish PATH/state before `exec`
+hands control to Bun.
 
 ### Bucket B — Should become TypeScript (0 files remaining — empty as of 2026-04-30T08:07:32Z)
 
@@ -100,7 +112,7 @@ tools/hygiene/snapshot-github-settings.ts       # was .sh
 
 ### Bucket D — Ported, bash retained (0 tracked files; historical list)
 
-The TS ports landed in #866 + #868 + #870 + #872 + #874 + #876 + #878 + #880 + #882 + #883 + #884 + #885 + #892 + #894 + #896 + #898 + #900 + #901 + #902. The bash originals listed below are now historical references, not tracked live files; the bash-retirement inventory check fails if any equivalent post-install `.sh` surface reappears outside setup/bootstrap.
+The TS ports landed in #866 + #868 + #870 + #872 + #874 + #876 + #878 + #880 + #882 + #883 + #884 + #885 + #892 + #894 + #896 + #898 + #900 + #901 + #902. The bash originals listed below are now historical references, not tracked live files; the bash-retirement inventory check fails if any equivalent post-install `.sh` surface reappears outside setup/bootstrap, launchd-bootstrap, and the Kiro loop wrapper.
 
 **Removed 2026-05-03 (CI-workflow .sh→.ts conversion completed):** the 5 files
 listed in #1376's risk-stratification (audit-memory-index-duplicates,
diff --git a/package.json b/package.json
index ba55a49cad..ea3bbb1916 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "test:typescript": "bun test",
     "hygiene:sort-tick-history": "bun ./tools/hygiene/sort-tick-history-canonical.ts",
     "hygiene:fix-markdown": "bun ./tools/hygiene/fix-markdown-md032-md026.ts",
+    "hygiene:check-bash-retirement-inventory": "bun ./tools/hygiene/check-bash-retirement-inventory.ts --enforce",
     "shadow": "bun tools/shadow/zeta-shadow.ts"
   },
   "bin": {
diff --git a/tools/hygiene/check-bash-retirement-inventory.test.ts b/tools/hygiene/check-bash-retirement-inventory.test.ts
index 05d3d66ab1..43829930d6 100644
--- a/tools/hygiene/check-bash-retirement-inventory.test.ts
+++ b/tools/hygiene/check-bash-retirement-inventory.test.ts
@@ -5,6 +5,7 @@ import {
   EXPECTED_RETAINED_BASH,
   hasDrift,
   renderReport,
+  RETAINED_BASH_SCOPE,
 } from "./check-bash-retirement-inventory";
 
 function splitExpectedRetained(): readonly [string, readonly string[]] {
@@ -14,7 +15,7 @@ function splitExpectedRetained(): readonly [string, readonly string[]] {
 }
 
 describe("buildInventoryReport", () => {
-  test("accepts the retained setup/bootstrap allowlist", () => {
+  test("accepts the retained bash allowlist", () => {
     const report = buildInventoryReport(EXPECTED_RETAINED_BASH);
 
     expect(hasDrift(report)).toBe(false);
@@ -31,7 +32,7 @@ describe("buildInventoryReport", () => {
     expect(report.drift.missingRetained).toEqual([]);
   });
 
-  test("flags missing retained setup scripts", () => {
+  test("flags missing retained bash scripts", () => {
     const [missing, rest] = splitExpectedRetained();
     const report = buildInventoryReport(rest);
 
@@ -45,7 +46,9 @@ describe("renderReport", () => {
   test("renders an OK summary for a matching inventory", () => {
     const report = buildInventoryReport(EXPECTED_RETAINED_BASH);
 
-    expect(renderReport(report)).toContain("OK: retained non-Lean bash surface matches setup/bootstrap allowlist.");
+    expect(renderReport(report)).toContain(
+      `OK: retained non-Lean bash surface matches ${RETAINED_BASH_SCOPE} allowlist.`,
+    );
   });
 
   test("renders drift sections", () => {
@@ -55,7 +58,7 @@ describe("renderReport", () => {
 
     expect(rendered).toContain("## Unexpected non-Lean bash files");
     expect(rendered).toContain("tools/hygiene/new-post-install-wrapper.sh");
-    expect(rendered).toContain("## Missing retained setup/bootstrap files");
+    expect(rendered).toContain(`## Missing retained ${RETAINED_BASH_SCOPE} files`);
     expect(rendered).toContain(missing);
   });
 });
diff --git a/tools/hygiene/check-bash-retirement-inventory.ts b/tools/hygiene/check-bash-retirement-inventory.ts
index 5a03fa6458..1bd1e39c47 100644
--- a/tools/hygiene/check-bash-retirement-inventory.ts
+++ b/tools/hygiene/check-bash-retirement-inventory.ts
@@ -3,7 +3,9 @@
 //
 // The TypeScript/Bun migration is in bash-retirement mode: repo tools should
 // not grow new post-install `.sh` entrypoints. The only non-Lean shell scripts
-// still allowed are setup/bootstrap scripts that run before Bun is available.
+// still allowed are setup/bootstrap scripts that run before Bun is available,
+// launchd bootstrap scripts that establish the pinned Bun environment, and
+// the Kiro loop wrapper that is itself launched by launchd.
 //
 // Usage:
 //   bun tools/hygiene/check-bash-retirement-inventory.ts
@@ -33,8 +35,11 @@ export interface InventoryReport {
 }
 
 const SPAWN_MAX_BUFFER = 64 * 1024 * 1024;
+export const RETAINED_BASH_SCOPE = "setup/bootstrap/launchd-bootstrap/Kiro-wrapper";
 
 export const EXPECTED_RETAINED_BASH: readonly string[] = [
+  "tools/kiro/kiro-loop-wrapper.sh",
+  "tools/kiro/launchd/install.sh",
   "tools/setup/common/curl-fetch.sh",
   "tools/setup/common/dotnet-tools.sh",
   "tools/setup/common/elan.sh",
@@ -129,7 +134,7 @@ export function renderReport(report: InventoryReport): string {
   lines.push(`missing_retained: ${String(report.drift.missingRetained.length)}`);
   lines.push("");
   if (!hasDrift(report)) {
-    lines.push("OK: retained non-Lean bash surface matches setup/bootstrap allowlist.");
+    lines.push(`OK: retained non-Lean bash surface matches ${RETAINED_BASH_SCOPE} allowlist.`);
     return `${lines.join("\n")}\n`;
   }
   if (report.drift.unexpected.length > 0) {
@@ -139,7 +144,7 @@ export function renderReport(report: InventoryReport): string {
     lines.push("");
   }
   if (report.drift.missingRetained.length > 0) {
-    lines.push("## Missing retained setup/bootstrap files");
+    lines.push(`## Missing retained ${RETAINED_BASH_SCOPE} files`);
     lines.push("");
     for (const file of report.drift.missingRetained) lines.push(`- ${file}`);
     lines.push("");
@@ -154,7 +159,7 @@ function usage(): string {
     "  bun tools/hygiene/check-bash-retirement-inventory.ts --enforce",
     "  bun tools/hygiene/check-bash-retirement-inventory.ts --json",
     "",
-    "Checks that non-Lean tracked .sh files are limited to setup/bootstrap scripts.",
+    `Checks that non-Lean tracked .sh files are limited to ${RETAINED_BASH_SCOPE} scripts.`,
   ].join("\n");
 }