diff --git a/packages/verify/package.json b/packages/verify/package.json
index 3f560ba454..3ebe106911 100644
--- a/packages/verify/package.json
+++ b/packages/verify/package.json
@@ -22,7 +22,8 @@
     "build": "tsup --config ../../tsup.config.ts && node ../../scripts/check-dts-emitted.mjs",
     "dev": "tsc -w",
     "test": "vitest run",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit && pnpm check:test-typecheck",
+    "check:test-typecheck": "tsx ../../scripts/check-test-typecheck.mts --self-test && tsx ../../scripts/check-test-typecheck.mts --package packages/verify --project tsconfig.test.json"
   },
   "dependencies": {
     "@objectstack/core": "workspace:*",
diff --git a/packages/verify/src/harness.host-resolution.test.ts b/packages/verify/src/harness.host-resolution.test.ts
index 749d621735..c89a1c1b1d 100644
--- a/packages/verify/src/harness.host-resolution.test.ts
+++ b/packages/verify/src/harness.host-resolution.test.ts
@@ -31,7 +31,7 @@ import { describe, it, expect, beforeAll, afterAll, afterEach } from 'vitest';
 import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
-import { bootStack } from './harness';
+import { bootStack } from './harness.js';
 
 /**
  * Stand-in for `@objectstack/organizations`. Mirrors the real plugin's
diff --git a/packages/verify/src/harness.posture-only.test.ts b/packages/verify/src/harness.posture-only.test.ts
index 0d4fbba30c..b143ece5ab 100644
--- a/packages/verify/src/harness.posture-only.test.ts
+++ b/packages/verify/src/harness.posture-only.test.ts
@@ -20,7 +20,7 @@
 // claim untestable: green whether or not the option actually stands alone.
 
 import { describe, it, expect, afterEach } from 'vitest';
-import { bootStack } from './harness';
+import { bootStack } from './harness.js';
 
 const app = {
   manifest: {
diff --git a/packages/verify/src/harness.posture.test.ts b/packages/verify/src/harness.posture.test.ts
index 414dc5c326..be69c2f333 100644
--- a/packages/verify/src/harness.posture.test.ts
+++ b/packages/verify/src/harness.posture.test.ts
@@ -13,7 +13,7 @@
 // integration test.
 
 import { describe, it, expect, vi, afterEach } from 'vitest';
-import { bootStack } from './harness';
+import { bootStack } from './harness.js';
 
 class FakeOrganizationsPlugin {
   readonly name = 'fake-organizations';
diff --git a/packages/verify/tsconfig.test.json b/packages/verify/tsconfig.test.json
new file mode 100644
index 0000000000..25bb5b4030
--- /dev/null
+++ b/packages/verify/tsconfig.test.json
@@ -0,0 +1,73 @@
+// The TEST-layer type-check program (#15145), adopting the #5286 mechanism that
+// #5449 generalised and that 30 sibling configs now use. `tsconfig.json` beside
+// this file is unchanged: it is the BUILD config, its `exclude` of
+// `**/*.test.ts` stays, and this sibling puts the excluded layer in front of
+// tsc. `package.json`'s `typecheck` NAMES this file (via
+// `check:test-typecheck --project`), because a config no script invokes is
+// exactly the phantom this whole mechanism is about.
+//
+// BEFORE THIS FILE, NO tsc PROGRAM COMPILED A SINGLE TEST FILE HERE, and that
+// is measured rather than read off the config. On the tree at 1d67130585 with
+// the workspace closure built first, `tsc --noEmit --listFiles -p tsconfig.json`
+// puts 0 of this package's 10 `src/*.test.ts` files in the program while
+// holding all 9 of its non-test `src/**` files -- so the zero is the `exclude`
+// line and not a probe that sees nothing. The same probe against THIS config,
+// on that same tree, names 10 of 10 (981 program files -> 990).
+//
+// ⚠️ ROUTE (b) WAS AVAILABLE HERE AND WAS NOT TAKEN, which is worth recording
+// because `check-type-check-coverage.mjs` tells the next reader to assume it is
+// not: dropping `**/*.test.ts` from `tsconfig.json`'s `exclude` leaves
+// `pnpm check:type-source-resolution` GREEN for this package (measured under a
+// trap-restored mutation at 1d67130585 -- exit 0, 124 programs across 78
+// packages), unlike the 14 of 18 entries that gate reports as red. It was
+// declined on module semantics, not on availability: vitest executes these
+// files through vite, which resolves extension-less relative specifiers, while
+// `tsconfig.json` inherits `NodeNext` from the repo root and demands `.js` on
+// every one of them. Route (b) would hold the test layer to a resolver that
+// never runs it -- the same config-tier noise the shared gate's header
+// attributes 108 of spec's 842 raw errors to. Matching vitest is fidelity, not
+// laxity, and it is why 28 of the 30 sibling configs override these two keys.
+//
+// ⛔ STRICTNESS IS UNTOUCHED. `strict`, `noUnusedLocals`, `noUnusedParameters`,
+// `noImplicitReturns`, `esModuleInterop` and the rest are inherited from
+// `tsconfig.json` (and through it from the repo root). `rootDir: ".."` and the
+// `@objectstack/core` source `paths` rule are inherited too, deliberately: this
+// program resolves core's types from source for the same #15229 reason the
+// build config does. Nothing here may loosen a type rule; if a test does not
+// compile, that is the finding.
+//
+// MEASURED on the tree at 1d67130585, workspace closure built first (an error
+// count taken against an unbuilt closure is not a reading -- unresolved-import
+// cascades inflate it): this program reports 0 errors over 10 test files, so
+// there is no `test-typecheck-debt.json` beside it and every error any of those
+// 10 files ever gains is red on arrival. 14 of the 30 sibling configs are in
+// that same state. This layer also holds ZERO `@ts-expect-error` directives
+// (grepped with a positive control -- the same grep hits `packages/spec/src`),
+// so no pin was silently dead here; what the gap cost was the other half.
+//
+// ⛔ AND THEREFORE NO `gen:test-typecheck-debt` SCRIPT EITHER. That pairing is
+// 1:1 across all 30 sibling configs -- 16 with a ledger declare the generator,
+// 14 without one declare nothing -- and it is enforced rather than stylistic:
+// `check:merge-driver` requires every manifest generator to carry a merge
+// disposition in `scripts/regen-artifacts.mjs`, and #14062's note on that file
+// refuses to invent one for a ledger that does not exist. Measured here: adding
+// the script alone reds that gate ("generator(s) with NO recorded merge
+// disposition: gen:test-typecheck-debt [@objectstack/verify]"). If this layer
+// ever measures non-zero, the ledger, the generator and its regen-artifacts row
+// arrive together, in that one PR. The `@objectstack/verify` TEST_DEBT entry in
+// `scripts/check-type-check-coverage.mjs` graduates in this same PR: it recorded
+// TS2835 x3 for three extension-less `./harness` imports, and with those three
+// given their `.js` the gate re-measured the entry at 0 ("TEST_DEBT records 3,
+// and tsc now reports 0 -- graduation candidate").
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022"],
+    "types": ["node"]
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}
diff --git a/scripts/check-type-check-coverage.mjs b/scripts/check-type-check-coverage.mjs
index 2fc720be42..195f410dad 100644
--- a/scripts/check-type-check-coverage.mjs
+++ b/scripts/check-type-check-coverage.mjs
@@ -1033,6 +1033,59 @@ const EXEMPT = {
 // So the shrink-only guarantee did not loosen here; it moved to a strictly
 // sharper instrument, one that also reddens on a wholesale substitution of
 // error IDENTITY at a constant total, which a per-package integer cannot see.
+//
+// ── #15145: `@objectstack/verify` GRADUATED — and this one WAS paid down ───
+//
+// `verify` (3) left this ledger on 2026-09-04. ⛔ Do NOT read it through the
+// blocks above it: those all warn that a deleted entry left its population
+// undiminished, and this one is the other case (`plugin-security` is the
+// nearest precedent, and even it ledgered nothing only because its 9 residual
+// errors were repaired by hand). Here the entry recorded
+// TS2835 x3 for three extension-less `./harness` imports, all three were given
+// their `.js`, and the re-measure then read the entry at ZERO before anything
+// was wired -- this gate's own line, quoted: "@objectstack/verify: TEST_DEBT
+// records 3, and tsc now reports 0 -- graduation candidate". So there is no
+// `packages/verify/test-typecheck-debt.json`: at zero residue a bare
+// `tsc --noEmit -p tsconfig.test.json` is the stronger gate, the call
+// `plugin-security`, `metadata-core`, `metadata-fs` and `trigger-record-change`
+// made before it, and every error any of the package's 10 test files ever gains
+// is red on arrival with no ledger to be added to.
+//
+// ⚠️ MEASURED IN THAT ORDER ON PURPOSE, because the entry's own note predicted
+// the outcome ("the same one-line fix graduates this entry") and a prediction is
+// not a licence. Collapsing a TS2835 cascade EXPOSES errors as well as removing
+// them -- the #8612 lesson this ledger carries twice above -- and the card that
+// filed this had itself watched the entry drift 3 -> 5 (+2 TS7006) the moment
+// two `.then` callbacks were added behind that same unresolved specifier. The
+// honest move on an upward count is to RE-TALLY, not to delete. Here it went
+// down, and only the measurement could say which.
+//
+// THE WIRING IS THE OTHER HALF, and it is what the entry's disappearance now
+// rests on: `packages/verify/tsconfig.test.json` compiles `src/**/*` with
+// vitest-matching module semantics and `package.json`'s `typecheck` NAMES it,
+// so `hidesTests` is false. Measured with the closure built: the build config
+// puts 0 of the package's 10 `src/*.test.ts` in its program (and all 9 non-test
+// `src/**` files); the test config puts 10 of 10. The package's own advertised
+// `typecheck` was green over a layer it had never read -- which is the defect
+// the card was about, and which deleting a ledger entry alone would have left
+// exactly where it was.
+//
+// ⚠️ The pin half reported nothing here in either direction and still does not:
+// this package's test layer holds ZERO `@ts-expect-error` directives (grepped
+// with a positive control -- the same grep hits `packages/spec/src`), so
+// PINS_CHECKED had no subject. The card's sharpest line -- that a
+// `ts-expect-error` in those files is a phantom check -- is a statement about
+// what WOULD happen, not about an existing dead pin, exactly as `cli`'s
+// graduation recorded for its own 115 files.
+//
+// ⚠️ ROUTE (b) WAS AVAILABLE HERE and was still not taken. The #11491 note
+// above names `verify` as one of the 4 entries whose exclusion could be dropped
+// with `check:type-source-resolution` staying green, and that split was
+// re-measured on 2026-09-04 under a trap-restored mutation and still holds for
+// this package (exit 0; 124 programs across 78 packages). It was declined on
+// module semantics: `tsconfig.json` inherits NodeNext from the repo root and
+// would hold the test layer to a resolver vitest never runs it under. Onboard
+// by WIRING, not by widening the build config.
 const TEST_DEBT = {
 // ── #14710: `@objectstack/cli` GRADUATED, and it was not paid down ─────────
 //
@@ -1154,16 +1207,6 @@ const TEST_DEBT = {
       + 'module-level `VARS` and a partial context cannot satisfy it; the same file already carries a '
       + 'hand-widened copy of that helper (`filterOf`) written for exactly that reason.',
   },
-  '@objectstack/verify': {
-    errors: 3,
-    note: 'TS2835 x3 -- `harness.host-resolution`, `harness.posture-only` and `harness.posture` each '
-      + 'import `./harness` without the `.js` extension. Re-tallied from the 8 measured at 5ab08428 '
-      + '(TS2835 x4, TS7006 x4) when `derive.test.ts` gained its own extension: that ONE unresolved '
-      + 'import was carrying 1 x TS2835 plus every TS7006 in the file, because a specifier that does '
-      + 'not resolve under NodeNext makes every symbol it names `any` and so every callback parameter '
-      + 'implicitly any. The remainder is the same NodeNext pair from the top-of-ledger note, and the '
-      + 'same one-line fix graduates this entry.',
-  },
   '@objectstack/connector-mcp': { errors: 5, note: 'TS2339 x5. Re-measured 5 at 5ab08428, exact.' },
   '@objectstack/connector-openapi': { errors: 5, note: 'TS2339 x5. Re-measured 5 at 5ab08428, exact.' },
   '@objectstack/http-conformance': {