chore: rename v3.0.0 to v3.0.0-rc1 in changelog

Author: juanibiapina

CHANGELOG.md

@@ -20,7 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **`job_updated` event**: New event type emitted when a job's metadata changes (e.g., description update for running job)
   - TUI automatically refreshes job descriptions when this event is received
 
-## [3.0.0] - 2026-01-25
+## [3.0.0-rc1] - 2026-01-25
 
 **Breaking change:** Gobfile format changed from plain text to TOML (`.config/gobfile` → `.config/gobfile.toml`).