build: emit JS with tsc and move gates out of build

Drop SWC; one tsc pass writes dist JS and declarations. contrast-test
and dep-guard run in CI after the build. prepack still runs the build.
Remove the stale pnpm-lock.yaml; the repo uses bun.

Closes CL-9368

Author: TheGreatAxios

.github/workflows/ci.yml

@@ -23,6 +23,7 @@ jobs:
       - run: bun install --frozen-lockfile
       - run: bun run typecheck
       - run: bun run lint
-      - run: bun run dep-guard
       - run: bun test
       - run: bun run build
+      - run: bun run contrast-test
+      - run: bun run dep-guard

.swcrc

@@ -24,27 +24,24 @@ points. There is no CLI, no component generator and no docs site, and that is de
 
 ## The build
 
-`bun run build` is four steps and a gate, joined by `&&`, in order:
+`bun run build` is three steps, joined by `&&`, in order:
 
 | Step | Tool | Output |
 | --- | --- | --- |
 | `generate` | `scripts/generate-exports.mjs` | `src/index.ts` and the `exports` map in `package.json` |
-| `build:js` | SWC | `dist/**/*.js`, one per source file |
-| `build:types` | `tsc -p tsconfig.build.json` | `dist/**/*.d.ts` |
+| `build:js` | `tsc -p tsconfig.build.json` | `dist/**/*.js` and `dist/**/*.d.ts`, one per source file |
 | `build:css` | Tailwind v4 CLI | `dist/styles.css`, plus `dist/theme.css` copied from source |
-| `contrast-test` | `scripts/contrast-test.mjs` | the gate — reads `dist/styles.css` |
 
-SWC does the JavaScript because it is fast and per-file; `tsc` does the declarations
-because SWC does not emit them. Nothing bundles, so nothing can merge two modules into
-one chunk. `prepack` runs the whole thing, so a failing gate cannot be packed or
-published.
+`tsc` emits the JavaScript and the declarations in one pass. Nothing bundles, so nothing
+can merge two modules into one chunk. `prepack` runs the build, so npm publishes a fresh
+`dist/`. The gates (`contrast-test`, `dep-guard`) run in CI after the build.
 
 Source imports are relative and carry `.js` extensions. There is no path alias, so the
 emitted files are valid ESM for Node as well as for every bundler.
 
 Every component module that calls a hook, creates a context, defines an inline event
 handler, or imports an optional peer (Radix dialog, dropdown-menu or tooltip, or
-`sonner`) starts with `"use client"`, and SWC carries the directive into `dist/`. A React Server Components consumer renders any
+`sonner`) starts with `"use client"`, and `tsc` carries the directive into `dist/`. A React Server Components consumer renders any
 component directly; stateless components stay server-renderable. Plain-React bundlers
 ignore the directive. `dep-guard` enforces the rule, and checks `dist/` after a build.
 
@@ -118,7 +115,7 @@ provider; every other component does not.
 
 ### Contrast is gated
 
-`contrast-test` is the last step of the build. It parses the **built** `dist/styles.css`
+`contrast-test` runs in CI after the build. It parses the **built** `dist/styles.css`
 for the `:root` and `.dark` custom properties and derives its pairs from token *names*,
 never from listed hexes, so a new `--warning` / `--warning-foreground` is covered on the
 next run with no edit. Six rules:

ARCHITECTURE.md

@@ -79,6 +79,11 @@ contract — modules that are not exported are internal and may change in any re
   `ui/menu`, `ui/tooltip` and `ui/toast` leave the root barrel; import them by subpath
   (`import { Toaster, toast } from "@corbits/react-ui/ui/toast"`).
 
+### Changed
+
+- **Build emits JavaScript with `tsc`.** SWC is gone; one `tsc` pass writes `dist/**/*.js`
+  and `.d.ts`. `contrast-test` and `dep-guard` run in CI instead of inside `build`.
+
 ### Added
 
 - **`"use client"` on stateful components.** The 45 `ui/` and `blocks/` modules that call

CHANGELOG.md

@@ -26,7 +26,7 @@ consumer's data layer, not in a component — data arrives as props.
 ## Gates
 
 ```sh
-bun run build          # generate → SWC → tsc → Tailwind → the contrast gate
+bun run build          # generate → tsc (JS + types) → Tailwind
 bun run typecheck      # tsc --noEmit
 bun run lint           # eslint .
 bun run dep-guard      # forbidden-import checks over src/

CONTRIBUTING.md

@@ -22,19 +22,17 @@ Why the library exists lives in [PRODUCT.md](./PRODUCT.md).
 
 ## Toolchain
 
-Development uses **bun**. `bun run build` is four steps and a gate, joined
-by `&&`:
+Development uses **bun**. `bun run build` is three steps, joined by `&&`:
 
 | Step | Tool | Output |
 | --- | --- | --- |
 | `generate` | `scripts/generate-exports.mjs` | `src/index.ts` and the `exports` map in `package.json` |
-| `build:js` | SWC (`@swc/cli`, `@swc/core`) | `dist/**/*.js`, one per source file |
-| `build:types` | `tsc -p tsconfig.build.json` | `dist/**/*.d.ts` |
+| `build:js` | `tsc -p tsconfig.build.json` | `dist/**/*.js` and `dist/**/*.d.ts`, one per source file |
 | `build:css` | Tailwind v4 CLI | `dist/styles.css`, plus `dist/theme.css` copied from source |
-| `contrast-test` | `scripts/contrast-test.mjs` | the gate — reads `dist/styles.css` |
 
 Source imports are relative and carry `.js` extensions. There is no path
-alias. `prepack` runs the whole build so a failing gate cannot be packed.
+alias. `prepack` runs the build. CI runs `contrast-test` (reads `dist/styles.css`)
+and `dep-guard` after it.
 
 Other scripts: `bun run typecheck`, `bun run lint` (eslint),
 `bun run dep-guard` (`scripts/dep-guard.mjs` — fails if any file imports