style: remove every em-dash and en-dash

Eighteen occurrences across fourteen files. Each sentence was repunctuated to
suit what the dash was doing rather than swapped for a hyphen, which produces
comma splices. The minus sign in folio-web's ledger is a minus sign and stays.

Claude-Session: https://claude.ai/code/session_01A5KmftdEJ49A9z5mF5ESrX

internal/driver/chrome/translate.go

@@ -68,7 +68,7 @@ func TranslateStringSelector(selector string) (string, bool, error) {
 //   - everything else passes through, including non-ASCII
 //
 // Callers should not pass this output into identifier contexts (class names,
-// tag names) — use an attribute selector form (`[class~="..."]`) instead.
+// tag names). Use an attribute selector form (`[class~="..."]`) instead.
 func cssEscape(value string) string {
 	var builder strings.Builder
 	builder.Grow(len(value))

internal/ltl/evaluator_test.go

@@ -45,9 +45,9 @@ func TestThunk_TransitionFromHoldToViolate(t *testing.T) {
 	wantSequence := []Verdict{
 		VerdictHolds,    // true
 		VerdictHolds,    // true
-		VerdictViolated, // false — latches
-		VerdictViolated, // true after violation — still violated
-		VerdictViolated, // true after violation — still violated
+		VerdictViolated, // false: latches
+		VerdictViolated, // true after violation: still violated
+		VerdictViolated, // true after violation: still violated
 	}
 	for index, want := range wantSequence {
 		got := evaluator.Observe()

internal/runner/llm_source.go

@@ -34,7 +34,7 @@ const (
 // screenshot, picks ONE number, and echoes that action so a mismatch can be
 // caught. The app-specific description (spec instructions) is appended.
 const llmSystemPrompt = "You are exercising a UI to find bugs. Each turn you get a screenshot and a numbered list of concrete actions, each with a weight hinting how much the test author wants it exercised (higher = more). " +
-	"Pick the ONE action most likely to make progress or expose a defect. Bugs often hide in repeated or rapid actions, so once a screen works, deliberately stress it — for example submitting the same form twice in a row to check it is not applied more than once — rather than only advancing. " +
+	"Pick the ONE action most likely to make progress or expose a defect. Bugs often hide in repeated or rapid actions, so once a screen works, deliberately stress it (for example submitting the same form twice in a row to check it is not applied more than once) rather than only advancing. " +
 	"Respond with your reasoning, the chosen number, and chosen_action copied verbatim from that line. For a typing action, also provide the text to enter."
 
 // llmSource selects each step's action with an OpenAI-compatible vision model

internal/trace/writer.go

@@ -92,7 +92,7 @@ type Action struct {
 	// LLMChoice is the 1-based number the model picked from the candidate list;
 	// LLMChosenAction is the action description it echoed for that number. The
 	// runner strict-skips when the echo disagrees with the numbered entry, so on
-	// a recorded action the two always agree — the replay UI shows them to
+	// a recorded action the two always agree; the replay UI shows them to
 	// confirm the reasoning matched the executed action.
 	LLMChoice       int    `json:"llm_choice,omitempty"`
 	LLMChosenAction string `json:"llm_chosen_action,omitempty"`