Make git-refs the sole enable default; drop backend picker

[gtrrz-victor]

https://entire.io/gh/entireio/cli/trails/975

Summary

• entire enable no longer prompts new users to choose between the git-refs and branch checkpoint backends — a storage-topology decision they can't meaningfully answer during first-run setup.
• git-refs (already the recommendation) is now written silently on first run.
• The branch backend stays fully reachable non-interactively via --checkpoint-backend branch.

Changes

• Removed promptCheckpointBackend / checkpointBackendChoices and the huh picker from checkpoint_backend.go.
• Simplified resolveFirstRunCheckpointBackend: flag wins, else git-refs default on first run.
• ENTIRE_CHECKPOINTS_PRIMARY env override and the config-less git-branch runtime fallback are unchanged, so existing repos are untouched.
• Dropped the picker unit test and the redundant "without --yes" subtest (only covered the deleted prompt branch).

Test plan

• go build ./cmd/...
• go test ./cmd/entire/cli/ -run 'TestRunEnableInteractive_FirstRunDefaultsToGitRefs|TestResolveCheckpointBackendType|TestApplyCheckpointBackend|TestUpdateCheckpointBackend' — pass
• golangci-lint v2.11.3 on cmd/entire/cli/... — 0 issues

🤖 Generated with Claude Code

---

Note

Low Risk
Setup UX and default-selection logic only; env override, configure path, and legacy config-less behavior are explicitly preserved.

Overview
First-time entire enable no longer asks users to pick checkpoint storage in an interactive form. git-refs is applied silently on first run (same as the former recommendation), while --checkpoint-backend branch still selects the shared branch backend.

The huh picker (promptCheckpointBackend / checkpointBackendChoices) is removed from checkpoint_backend.go, and resolveFirstRunCheckpointBackend is reduced to: explicit flag wins, else first-run default via firstRunCheckpointBackendDefault() (still empty when ENTIRE_CHECKPOINTS_PRIMARY is set so settings are not written). Config-less repos keep the git-branch runtime fallback; entire configure --checkpoint-backend is unchanged.

Tests for the picker contract and the headless “without --yes” branch that only exercised the deleted prompt are dropped.

^{Reviewed by Cursor Bugbot for commit 408435d. Configure here.}

[Copilot]

🟢 Ready to approve

The change cleanly removes the interactive picker while preserving explicit flag selection and the env-override suppression behavior, with remaining tests covering the intended first-run defaults.

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Pull request overview

This PR streamlines first-time entire enable by removing the interactive checkpoint-backend picker and making git-refs the sole default written on first run, while preserving non-interactive selection via --checkpoint-backend branch and honoring the ENTIRE_CHECKPOINTS_PRIMARY env override (so settings aren’t written when the env fully controls backend selection).

Changes:

• Removed the interactive checkpoint-backend picker (promptCheckpointBackend / checkpointBackendChoices) and simplified first-run selection to: explicit flag wins, else first-run default.
• Updated runEnableInteractive to use the new non-interactive resolveFirstRunCheckpointBackend signature.
• Removed tests that only covered the deleted prompt/choice contract.

File summaries

File	Description
cmd/entire/cli/setup.go	Simplifies first-run backend selection to flag-first, else git-refs default (or empty when env override is active).
cmd/entire/cli/setup_test.go	Drops the subtest that only exercised the removed prompt branch.
cmd/entire/cli/checkpoint_backend.go	Removes the huh-based picker helpers and prompt implementation.
cmd/entire/cli/checkpoint_backend_test.go	Removes tests that validated the now-deleted picker option ordering/labeling contract.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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[pjbgf]

Great to see this landing. 🙌