Guide first-run onboarding with numbered step copy

[TheGreatAxios]

Summary

• First-run provider setup shows Step N of M and field-specific guidance
• Adds a post-setup hint for Ctrl+A / /models
• Makes cold start less guesswork

Test plan

• Fresh install (no provider) shows welcome + step progress
• Each field shows contextual next-step guidance
• Enter/Esc still advance/back through fields and save works

Closes CL-5347

[linear-code]

CL-5347

[TheGreatAxios]

Code review (parent — multi-agent fleet unavailable)

Verdict: approve for first slice; issue scope is broader

Correctness

• Step N of M + field-specific guidance improves cold-start clarity.
• Post-setup Ctrl+A / /models hint is useful.
• Does not force a wizard on already-configured users (only runOnboarding path).

Gaps vs issue outcome

• Issue also wants guidance for invalid settings and connect when needed on the main path. This PR only improves the unconfigured-provider panel. Pair with CL-5348 (fail-open diagnostics) for the invalid-settings half.

Nits

• No tests (copy-only). Optional snapshot of ProviderSetupPanel would lock the step labels.

[TheGreatAxios]

Review — approve

Small, focused first-run copy improvement. No functional risk.

Notes

• Step N of M + per-field guidance is clear; Enter/Esc flow untouched.
• Mild redundancy: numbered guidance (1.…4.) plus FIELD_HINTS on the active field — fine for cold start.
• Post-setup hint (Ctrl+A / /models) is always visible during setup; acceptable.

Gaps

• Manual test plan only (no automated onboarding copy test) — OK for this size.
• No merge conflict with Fail open on invalid local settings with in-app diagnostics #322 (different files).

Verdict: approve — good to merge as-is.

[TheGreatAxios]

Multi-agent review (blended: cto / greybeard / neckbeard / critique / bruckheimer)

Verdict: Approve (after post-review fix)

Fixed from review

• Onboarding step copy tightened so error + guidance still fit on small terminals.
• Post-setup shortcut text corrected to /model (was incorrect Ctrl+A / /models).

Ready for human review/merge.

[TheGreatAxios]

Hard review (greybeard + CTO)

Verdict: APPROVE

Greybeard

Numbered first-run steps are copy-only guidance — no new control flow. Low risk.

CTO

Ship. Follow-up polish can live elsewhere if we want richer onboarding later.

No blockers.