Chore: Add changeset for Job concept

Author: FL4TLiN3

.changeset/job-concept-implementation.md

@@ -0,0 +1,13 @@
+---
+"@perstack/core": patch
+"@perstack/runtime": patch
+"@perstack/api-client": patch
+"@perstack/tui": patch
+"perstack": patch
+---
+
+Add Job concept as parent container for Runs
+
+- Add Job schema and jobId to Checkpoint, RunSetting, and Event types
+- Update storage structure to perstack/jobs/{jobId}/runs/{runId}/
+- Update CLI options: --job-id, --continue-job (replacing --continue-run)