[Task] Ship release with stale session context crash fix

[Astro-Han]

Goal

Ship a desktop release that includes PR #986 so users on v2026.5.29 no longer hit the stale Solid <Show> renderer crash when switching sessions or submitting into a freshly switched session.

Scope

In scope:

• Confirm the latest public release is still v2026.5.29 and does not include PR fix(app): avoid stale session context reads #986.
• Cut the next desktop release from dev after standard release checks pass.
• Confirm the published app includes merge commit c9b5c0472d / PR fix(app): avoid stale session context reads #986.
• Verify the in-app updater sees the new release.

Out of scope:

• Reopening the already-fixed product bug in [Bug] Stale Solid Show read when switching sessions #985.
• Changing the fix(app): avoid stale session context reads #986 fix unless a fresh reproduction shows the crash still exists on a build containing it.
• Broad run recovery work; that remains tracked separately by [Feature] Define Run Incident Framework for interrupted runs #808 / [Feature] Recover model runs after tool activity on transport disconnect #927.

Relevant files or context

• Original bug: [Bug] Stale Solid Show read when switching sessions #985
• Fix PR: fix(app): avoid stale session context reads #986
• Latest current public release checked on 2026-05-31: v2026.5.29, published 2026-05-29T01:00:43Z.
• PR fix(app): avoid stale session context reads #986 merged 2026-05-29T16:13:15Z, after v2026.5.29 was published.
• Current local repro artifact from v2026.5.29:
  • /Users/yuhan/Downloads/pawwork-session-quick-falcon-2026-05-31-04-07-37.json
  • The export shows an interrupted first turn after app restart: assistant message has only step-start + empty reasoning, no finish, no error part, and zero tokens.
  • Local logs show PawWork restarted at 2026-05-31 12:07:05 local time, but no crash stack or problem report was captured.
• The observed current crash is consistent with the unreleased fix(app): avoid stale session context reads #986 fix, but the exact crash stack from this specific 2026-05-31 occurrence was not captured.

Verification

• Release checklist / CI passes for the new desktop version.
• gh release view <new-tag> shows a release newer than v2026.5.29.
• Download or updater smoke confirms the packaged app reports the new version.
• On a build containing fix(app): avoid stale session context reads #986, switching sessions and submitting a first prompt does not produce Stale read from <Show> or leave a zero-token half-turn.

Execution mode

Wait for human approval - the agent must not cut a release or publish artifacts until a human leaves an explicit approval comment on this issue.