Prompt Platform Cleanup Follow-On

This note captures prompt-platform cleanup work discovered while validating the tnh-gen testing slice that moved the repo-local prompt home to ./tnh-prompts/.

The immediate tnh-gen testing goal was achieved:

• repo-local default prompt discovery now resolves to ./tnh-prompts/
• the old setup-download path is no longer normative
• the active runtime no longer depends on PromptSystemSettings.tnh_prompt_dir

However, the review and rerun loop exposed remaining follow-on cleanup that should be handled as a separate prompt-platform slice rather than mixed into the current testing work.

Main follow-on areas

1. Docs triage and updates
2. Update user/developer docs that still imply the default prompt home is ./prompts
3. Add ADR addenda where older architecture docs still describe the external prompt-repo model as normative

4. Leave clearly archived historical docs alone unless they are presented as current

5. Experimental-surface labeling

6. Keep the concept of a prompt catalog as the active abstraction
7. Explicitly mark git-backed/shared prompt-catalog code and docs as experimental where still present

8. Avoid presenting prompt sharing or git-backed prompt distribution as the default tnh-gen operating path

9. Config / override hygiene

10. Confirm local override behavior remains intentional: explicit env/config/CLI overrides should still win
11. Reduce operator confusion from stale examples and old env-var assumptions
12. Prefer one clear runtime path for prompt-home resolution through GenAISettings + TNHContext

Why this is deferred

This work is adjacent to the active tnh-gen test slice, but not required to finish the current journal and JSON-golden validation loop. It is better handled as a focused cleanup pass after the testing slice is stabilized and reviewed.

Suggested return order

1. update current-facing docs
2. add ADR addenda / historical clarifications
3. label experimental code/doc surfaces
4. trim remaining prompt-sharing/generic legacy drift where safe