release: v0.3.1 — reminders survive a closed app + list-marker fix

[th3-br41n]

Pre-tag prep for v0.3.1 (patch). Merge, then the annotated v0.3.1 tag triggers the signed build + finalize publish.

Scope (on main since v0.3.0)

• Reminders survive a closed app (feat(automations): missed-reminder catch-up (0.3.1) #132) — a task/event reminder that came due while Brainstorm was closed catches up and fires once on next launch (persistent lastRun watermark; item-alerts only, workflows unaffected). Focused security review: clean.
• Editor list markers (fix(editor): compact-editor list markers (ol numbers / bullets) missing #131) — numbered/bulleted lists show markers again in comment/chat composers.
• Windows CI teardown flake (test: fix Windows EBUSY temp-dir teardown flake (blocks all PRs) #133) — fs.rm EBUSY retry (test-only).

This PR

In-app changelog 0.3.1 entry (before the tag) + version bump 0.3.0 → 0.3.1 (shell + root).

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