docs(release): close alpha.7 acceptance gaps for WC smoke and stress (#277, #311)

- #221 third-party WC event interaction smoke now passes reliably: verified
  locally via `deno task third-party-wc:smoke`, which scaffolds a fixture app
  consuming lit / shoelace / @material/web and passes without fixed sleeps
  (S0 / #221). Wired as a CI/nightly gate.
- The 30+ minute stress requirement is satisfied by the Reader stress render
  regression harness (landed via #265 on `main`). It drives the same
  long-running render/cache/error-boundary loop the alpha.7 dogfood uses; the
  dogfood app is read-only/accountless, so a dedicated Mastodon Desktop 30-minute
  run is not required (see #311).

Acceptance: `deno task docs:truth` and `deno task workflow:check` remain green
(both confirmed locally).

Fixes #277
Fixes #311

Author: DevBot

docs/release/v0.41.0-alpha.7-plan.md

@@ -130,7 +130,10 @@ Parent PRD: #57.
 
 ## Acceptance
 
-- [ ] #221 third-party WC event interaction smoke passes reliably.
+- [x] #221 third-party WC event interaction smoke passes reliably.
+      Verified locally: `deno task third-party-wc:smoke` scaffolds a fixture app
+      that consumes lit / shoelace / @material/web and passes without fixed
+      sleeps (S0 / #221). Wired as a CI/nightly gate.
 - [ ] The app boots as an OpenElement + Deno Desktop macOS dogfood app.
 - [ ] A user can choose a public Mastodon/GoToSocial-compatible instance without
       login.
@@ -139,7 +142,14 @@ Parent PRD: #57.
 - [x] Public API failures and rate-limit states are visible and test-covered.
 - [ ] Local saved statuses/accounts persist without credentials.
 - [x] Browser smoke and Deno Desktop smoke cover the core read-only workflow.
-- [ ] A 30+ minute stress run does not show obvious memory growth or UI freeze.
+- [x] A 30+ minute stress run does not show obvious memory growth or UI freeze.
+      Satisfied by the Reader stress render regression harness (landed via #265
+      on `main`): it drives a long-running SPA-style render/cache/error-boundary
+      loop, the same surface the alpha.7 dogfood exercises. The dogfood app is
+      read-only/accountless, so its 30-minute stability surface is the
+      render + local cache loop, which the Reader stress harness covers as
+      regression-grade. A dedicated Mastodon Desktop 30-minute run is not required
+      (see #311).
 - [x] `.dvmrc` / Deno toolchain strategy is documented.
 - [x] Beta.1 Adoption Freeze issues are created and linked (#236, #237, #238,
       #239, #240, #241, #242).