fix(cli): restore "Successfully exported state" confirmation on export

[mazze93]

Summary

Fixes the failing CI on main (and therefore every PR branched from it, including #11).

The integration test testExportAndImportAcceptUserFlagBeforeCommandFlag asserts the export command's stdout contains "Successfully exported state". During the Edgar/RavenRenderer work the CLI's export-success path (Sources/contextsynapse/main.swift) was changed to print only the themed edgar · session folded → … line, dropping the plain confirmation. The import path still prints its plain Successfully imported state from: … line — so only export lost its confirmation, an asymmetry that breaks the test whenever swift test builds and execs the CLI binary.

Change

One line: restore the plain Successfully exported state to: <file> confirmation on export success, alongside Edgar's flourish. Export and import are now symmetric, and the integration test passes.

     if core.exportState(to: url, metadata: metadata) {
+        print("Successfully exported state to: \(outputFile)")
         print("\u{001B}[2medgar · session folded → \(outputFile)\u{001B}[0m")
         exit(0)
     }

Test plan

• Build, test, and guardrails (macos-15) green — the failing assertion at Tests/BayesianConvergenceTests.swift:223 now passes
• Export still prints the Edgar session folded line (no UX regression)

https://claude.ai/code/session_01BBeeaADak63VbvE7kuYw96

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