fix(ui): honor OBOL_NONINTERACTIVE on a real TTY

[bussyjd]

Problem

OBOL_NONINTERACTIVE=true had no effect on a real TTY. internal/ui/prompt.go's
isInteractive() gated prompting on JSON-output mode and TTY detection only:

func (u *UI) isInteractive() bool {
	return !u.IsJSON() && u.IsTTY()
}

It never consulted the env var, so scripted/automated runs launched from a real
terminal (e.g. CI runners with a pty, installer wrappers) still hit every
Confirm/Select/Input call and blocked waiting on stdin — including the
"start cluster now?" and Ollama-model prompts during obol stack up.

Audited every Confirm/Select call site in the codebase (internal/app,
internal/openclaw, internal/network, internal/tunnel, internal/stackbackup,
internal/hermes, internal/stack/safety.go, cmd/obol/*.go): all of them
already route through UI.Confirm/UI.Select, and there is no raw
survey/promptui prompt anywhere in internal/. The Ollama-detection logic in
internal/stack/stack.go only warns/logs when no models are pulled — it
never calls Confirm. So the single isInteractive() guard is the one and
only chokepoint; no other call site needed touching.

Fix

isInteractive() now also requires OBOL_NONINTERACTIVE is not "true":

func (u *UI) isInteractive() bool {
	return !u.IsJSON() && u.IsTTY() && os.Getenv("OBOL_NONINTERACTIVE") != "true"
}

Every prompt (Confirm, Select, Input, InputWithSuffix, SecretInput)
already short-circuits through isInteractive() and falls back to its
default/error path, so this one guard covers all of them.

Diagram

flowchart LR
    A[OBOL_NONINTERACTIVE env var] --> D{isInteractive guard}
    B[IsJSON] --> D
    C[IsTTY] --> D
    D -- "any condition false" --> E["Confirm/Select/Input\nreturn default (no prompt)"]
    D -- "all true" --> F["Confirm/Select/Input\nprompt on stdin"]

Loading

Validation

$ gofmt -l internal/ui/prompt.go internal/ui/prompt_test.go
(no output)

$ go build ./...
(exit 0)

$ go test ./internal/ui/... -count=1 -v
=== RUN   TestIsInteractive_OBOLNonInteractive
--- PASS: TestIsInteractive_OBOLNonInteractive (0.00s)
=== RUN   TestConfirm_OBOLNonInteractiveReturnsDefault
--- PASS: TestConfirm_OBOLNonInteractiveReturnsDefault (0.00s)
PASS
ok  	github.com/ObolNetwork/obol-stack/internal/ui	0.533s

---

https://claude.ai/code/session_01PnhCQLz7CHuDBUhWd5xF8v