Function pingBackend

internal/tui/model.go:1266–1272

pingBackend issues a short GET to baseURL/v1/models via cloud.Reachable. Any HTTP response counts as reachable; transport errors and timeouts mean disconnected. The result carries the URL it was issued against so Update can drop late results arriving after a /models switch.

(baseURL string)

	dbgWritef("nudge", "finish re-grounding nudge injected at %d tool calls this turn", m.toolRounds)
	m.history = append(m.history, chmctx.Message{
		Role:    chmctx.RoleSystem,
		Content: nudgeOrigin + "Before you finish: re-read the original request and walk its acceptance criteria one at a time. For each, name the check you actually ran and what it showed. Anything runnable you built or changed is proven only by running it - build or type-check it, run the test, execute the script, or for a page or UI load it in a headless browser and drive the primary interaction (click Start, press the keys, submit the form) and confirm the state changed - then fix what breaks and re-run. If a check seems to need a runtime or browser this environment lacks, prove the lack with one read-only probe (`command -v node`, `command -v chromium chromium-browser google-chrome`, `ls ~/.cache/ms-playwright`) instead of assuming; the fire-once browser install your instructions allow is the ONE install worth attempting, and only if you haven't tried it this turn - never re-try a failed install or hunt missing libs, and if the probe comes up empty with no network, stop hunting. Only then mark the check `unverified: <what> - <why>` and lead your summary with it, not with a confident \"works\"; never dress up a static check (a brace count, a grep, an HTTP 200) as proof, and never report a check you didn't run. Then reply with your one-line summary.",
	})
	return true
}

// cursorOnFirstLine: true when ↑ should walk prompt history instead of moving
// the textarea's own cursor. cursorOnLastLine is the mirror for ↓.
func (m Model) cursorOnFirstLine() bool { return m.ta.Line() == 0 }
func (m Model) cursorOnLastLine() bool  { return m.ta.Line() == m.ta.LineCount()-1 }