chore(objectql): retire the PR-10d.1 dry-run-hash-compat probe and its scripts program

The one-time ADR-0008 PR-10d.1 compatibility probe finished its job when
PR-10d.2 aligned the repository; nothing ships it (objectql's `files` is
`dist` only) and nothing runs it. Delete it rather than repair its
type-blind `hashSpec(body)` call.

- delete `packages/objectql/scripts/dry-run-hash-compat.ts` and its test
  `src/dry-run-hash-compat.test.ts` (no other importer of `runDryRun`);
- `scripts/` is now empty, so `tsconfig.scripts.json` and the `typecheck`
  leg that named it go too (an empty program fails TS18003);
- drop the two EXEMPT_FILES rows in `check-error-code-casing.mjs`;
- reword the comments that stated the deleted files as present: the
  `tsconfig.test.json` rootDir note, the two `.pin.ts` docblocks quoting
  the `typecheck` line, and four spots in `check-type-check-coverage.mjs`
  (dated census rows and measurements are kept as history).

Claude-Session: https://claude.ai/code/session_017ErfyP2Rx7XWHJA27QjyUi
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/objectql/package.json

@@ -21,7 +21,7 @@
     "build": "tsup && node ../../scripts/check-dts-emitted.mjs",
     "test": "vitest run --project local",
     "test:repo": "vitest run --project repo",
-    "typecheck": "tsc --noEmit && tsc --noEmit -p tsconfig.scripts.json && pnpm check:test-typecheck",
+    "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/objectql --project tsconfig.test.json",
     "gen:test-typecheck-debt": "tsx ../../scripts/check-test-typecheck.mts --update --package packages/objectql --project tsconfig.test.json"
   },

packages/objectql/scripts/dry-run-hash-compat.ts

@@ -29,8 +29,8 @@
  *
  * ⚠ It is NOT that a directive in a `*.test.ts` here would go unevaluated —
  * this docblock used to say so, and that is FALSE on this tree. This package's
- * `typecheck` is `tsc --noEmit && tsc --noEmit -p tsconfig.scripts.json &&
- * pnpm check:test-typecheck`, and the last leg runs
+ * `typecheck` is `tsc --noEmit && pnpm check:test-typecheck`, and the last
+ * leg runs
  * `--project tsconfig.test.json`, whose `include` is `src/**\/*` with no test
  * exclusion: 299 of this package's `src` test files are in that program,
  * measured with `tsc --listFiles` (0 in the build program — the firing control