ci(lotus): hard-gate lint, format and unit tests before build; add concurrency

The workflow only built and smoke-checked that dist/index.html existed,
so a type error, lint violation or failing test could be tagged straight
to a published npm release. Run `pnpm lint` (tsc + oxlint + knip),
`pnpm format:check` (oxfmt) and `pnpm test:unit --run` before the build,
all hard. Add the same cancel-in-progress concurrency group cinny's CI
uses so rapid pushes to lotus don't queue redundant full builds.

Also fixes the one tsc error the v0.25.0 merge surfaced in
lotusDecorations (lazyActions.off now returns the emitter), so the new
gate is green from its first run.

Fixes #5
Fixes #34

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

.gitea/workflows/ci.yml

@@ -20,6 +20,12 @@ on:
   pull_request:
     branches: [lotus]
 
+# A superseded push cancels its in-flight run (same guard as cinny's ci.yml):
+# rapid pushes to lotus otherwise queue one full build each on the shared runner.
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   # element-call's build:full sets 16384 already; keep parity for safety.
   NODE_OPTIONS: "--max-old-space-size=16384"
@@ -48,6 +54,18 @@ jobs:
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
+      # ── Quality gates (hard) — run BEFORE the slow build so a type/lint/
+      # format/test error fails in seconds. Upstream replaced eslint+prettier
+      # with oxlint+oxfmt in v0.25.0; `pnpm lint` = tsc + oxlint + knip.
+      - name: Lint (tsc + oxlint + knip)
+        run: pnpm lint
+
+      - name: Format check (oxfmt)
+        run: pnpm format:check
+
+      - name: Unit tests
+        run: pnpm test:unit --run
+
       - name: Build embedded
         # build:embedded writes to the repo-root dist/ (vite default outDir).
         # Stage it into embedded/web/dist — the publish template's "files" entry

src/lotus/lotusDecorations.ts

@@ -84,8 +84,9 @@ export function startLotusDecorations(): () => void {
       emit();
     };
     w.lazyActions.on(LotusWidgetActions.Decorations, handler);
-    unregister = (): void =>
+    unregister = (): void => {
       w.lazyActions.off(LotusWidgetActions.Decorations, handler);
+    };
   }
   registrations += 1;