chore(release): 0.3.0

Closes the `Unreleased` section as `## [0.3.0] - 2026-08-24` and bumps the
workspace version, the two edits `ci/verify-version.sh` gates a release PR on:
the check fails the PR if `releases/v{version}` already exists on the build
host, so the bump is what makes the merge to `release` publishable.

The closed section carries a handful of items that shipped in `0.2.0` — the
Docker-daemon restart fix, per-user event-triage tuning, the file viewer's
syntax highlighting. CHANGELOG.md was written after that release and backfilled
them, and `0.2.0` has no section of its own to move them into, so they are
recorded here rather than nowhere.

Cargo.lock

@@ -4207,7 +4207,7 @@ checksum = "8ee5873ec9cce0195efcb7a4e9507a04cd49aec9c83d0389df45b1ef7ba2e649"
 
 [[package]]
 name = "skald"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "astral_async_zip",