chore(release): bump version to 0.5.18

[its-saffron]

Version bump for release v0.5.18. The release will be published after this PR passes the required checks and merges.

dispatch 0.5.18

Highlights

First-party Helm chart, published to OCI. charts/dispatch, built on the
bjw-s common library (v5.0.1) — values read exactly like an app-template
HelmRelease. Migrations run in a pre-install,pre-upgrade hook Job
(prisma migrate deploy); server pods always start with
SKIP_DB_MIGRATIONS=true, making >1 replica safe. Published by this release
to oci://ghcr.io/misospace/charts/dispatch (chart version = app version).
Required Secret keys are documented in the chart's secret-contract.md. (#545, #550)

helm install dispatch oci://ghcr.io/misospace/charts/dispatch --version 0.5.18

Fixes

Closed ⇒ done actually enforces now. The sync fetched state=open only, so
closedIssueStatusFix (0.5.16) never saw a closed issue — closed issues kept
stale claimable labels (and could be claimed by agents). All sync paths now
fetch state=all; the first sync after deploy relabels stale closed issues to
status/done on GitHub. (#544)

Dependencies

• tsx 4.22.4 → 4.22.5 (fix(deps): update dependency tsx (4.22.4 → 4.22.5) #549); pr-reviewer-action v2.0.2 → v2.0.5 (ci(github-action): update action misospace/pr-reviewer-action (v2.0.2 → v2.0.5) #546)