fix(text-output): correct text output handling

[ksaurabhAparavi]

Summary

• Correct the text_output node's output handling (endpoint + instance).

Testing

• CI (./builder test) — relying on GitHub Actions; not runnable in the contributor's local shell (engine build / Maven / torch unavailable). Static checks (compile, no conflict markers) pass.

Linked Issue

Fixes #1166

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 13adce7a-4176-49cb-a231-6cd8b5229d4e

📥 Commits

Reviewing files that changed from the base of the PR and between efecb7e and ca4ae6e.

📒 Files selected for processing (2)

• nodes/src/nodes/text_output/endpoint.py
• nodes/src/nodes/text_output/instance.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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