Allow .mts and .mjs imports in no-asset-imports

.agents/memory/lit-analyzer-ts6.md

@@ -31,7 +31,7 @@ registerHooks({
 - Node runs the `.ts` script directly (type stripping), so no build step.
 - Import the package entry, or spawn the package's bin with
   `node:child_process`, rather than `await import("lit-analyzer/cli.js")`.
-  `project/no-asset-imports` allows `.js` subpaths, but the CLI file runs on
+  `project/no-asset-imports` allows `.js` (and `.mts`/`.mjs`) subpaths, but the CLI file runs on
   import and bypasses the package's public entry.
 - CI runs `npm run lit-check` as its own step.
 - It is tooling under `scripts/`: no tests; a narrow `overrides` entry for it

.agents/memory/ts-only-files-and-imports.md

@@ -1,5 +1,5 @@
 ---
-description: Every file is .ts (no js/mjs/cjs/jsx/tsx, configs included); imports name only .ts files or .js package subpaths; CSS comes from HTML, JSON/SVG become .ts modules
+description: Every file is .ts (no js/mjs/cjs/jsx/tsx, configs included); imports name only .ts files or .js/.mts/.mjs package subpaths; CSS comes from HTML, JSON/SVG become .ts modules
 ---
 
 The user's rule, from the Deno days and restated for Node (2026-10-12): "No
@@ -12,19 +12,22 @@ plain `.ts`. Build output in a gitignored folder is the only JS.
 `noUncheckedIndexedAccess`). If a tool or framework seems to need a JS or TSX
 file, stop and flag it instead of adding one.
 
-## No asset imports (2026-10-14, widened 2026-10-16)
+## No asset imports (2026-10-14, widened 2026-10-16 and 2026-10-17)
 
-`.ts` and `.js` imports are allowed: our own files stay `.ts`, and `.js`
-covers package subpaths such as `lit/decorators.js`.
-`project/no-asset-imports` (in `scripts/project-lint.ts`) fails:
+`project/no-asset-imports` (in `scripts/project-lint.ts`; it was
+`no-non-ts-imports` before 2026-10-16) fails:
 
 - a relative, absolute, `#`, or package-subpath specifier whose last segment
-  has any other extension: `.css`, `.json`, `.svg`, `.mjs`, `.tsx`;
+  has an extension other than `.ts`, `.js`, `.mts`, or `.mjs`: `.css`,
+  `.json`, `.svg`, `.jsx`, `.tsx`, and every other asset;
 - any `?query` suffix (`?raw`, `?url`, `?inline`);
 - any import attributes (`with { type: "json" }`, `with { type: "text" }`).
 
-Bare packages (`lit`, `@types/json-schema`, `lodash.debounce`), `#` aliases,
-and `node:` builtins pass. `@fortawesome/x/svgs/a.svg` fails.
+`.js`, `.mts`, and `.mjs` are allowed (user decision, 2026-10-17) for package
+subpaths such as `lit/decorators.js` or `pdfjs-dist/legacy/build/pdf.mjs`;
+our own files are still `.ts` only. `.jsx` and `.tsx` stay banned. Bare
+packages (`lit`, `@types/json-schema`, `lodash.debounce`), `#` aliases, and
+`node:` builtins pass. `@fortawesome/x/svgs/a.svg` fails.
 
 ```ts
 import "./theme.css"; // no