feat: add bump-version.sh script for version management

Automates version bumps across all version source files:
- Cargo.toml (PRIMARY - workspace.package.version)
- debian/changelog (prepend new entry)
- debian/control (update Version field)
- scripts/build-package.sh (update VERSION variable)
- frontend/package.json (update version field)
- Stale references check after bump

Usage: ./scripts/bump-version.sh <new_version> <old_version>

migrations/008_health_check_worker.sql

@@ -0,0 +1,4 @@
+-- Migration 008: Health check worker support
+-- Adds 'waiting_health_check' to the job_status enum for pre-patch health gates.
+
+ALTER TYPE job_status ADD VALUE IF NOT EXISTS 'waiting_health_check';