semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/excititor-vex-ingest-management-cli.md

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+# Excititor VEX Ingest Management CLI
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+Manage Excititor VEX ingest workflows: initialize state with checkpoint resume, pull from providers with time windows and force mode, and run exports.
+
+## Implementation Details
+- **Command Handlers**: `src/Cli/StellaOps.Cli/Commands/CommandHandlers.cs` -- Excititor-related handlers
+- **VEX Observations Client**: `src/Cli/StellaOps.Cli/Services/VexObservationsClient.cs` / `IVexObservationsClient.cs` -- VEX observations API client
+- **Commands**:
+  - `stella vex ingest init` -- initialize VEX ingest state
+  - `stella vex ingest pull --provider <name> --from <date> --to <date>` -- pull VEX statements from provider
+  - `stella vex ingest pull --force` -- force re-pull all statements
+  - `stella vex ingest export` -- export ingested VEX data
+
+## E2E Test Plan
+- [ ] Run `stella vex ingest init` and verify state initialized
+- [ ] Run `stella vex ingest pull --provider osv` and verify VEX statements pulled
+- [ ] Run `stella vex ingest pull --from 2024-01-01 --to 2024-12-31` and verify time window filtering
+- [ ] Run `stella vex ingest pull --force` and verify force re-pull
+- [ ] Run `stella vex ingest export` and verify export execution
+- [ ] Verify checkpoint resume works after interrupted pull