Rank captured tasks by what he actually said (#129)

Ordering is computed, not generated. Asking a 1.7B which of his tasks
matters most produces a fluent opinion with no basis in anything, and a
confidently wrong priority is worse than none — same posture as the
behaviour profile in internal/memory, which counts instead of summarising.

internal/tasks is a pure package (no ipc, no store, no cgo) holding the
score, the order and the Russian rendering, so the spoken list and the
/tasks page cannot drift. Four signals, all of them things he stated:
deadline (overdue > today > tomorrow > this week), stated urgency, age
with a cap so nothing rots at the bottom, and confirmed work always
ahead of mail-derived candidates. A task with no due date and no weight
scores nothing and carries no reason string — inventing a "потому что"
about a priority he never set is the failure mode this avoids.

Capture now picks up urgency he says out loud ("добавь в задачи срочно
оплатить интернет"), stripping the marker from the task text, and the web
add form offers the same three rungs. Ranking is a read: it sorts and
renders, never writes, schedules or announces.

internal/router/task.go

@@ -38,11 +38,33 @@ var taskCapturePrefixes = []string{
 	"new task",
 }
 
+// TaskCapture — a parsed capture: the task itself, plus the importance he
+// stated out loud if he stated one (Vikunja #129). Weight 0 means he said
+// nothing about importance, which the ranker treats as exactly that — no
+// urgency is inferred from the wording.
+type TaskCapture struct {
+	Text   string
+	Weight int
+}
+
+// urgencyMarkers — the words that set a weight, strongest first. Only these
+// two rungs: "срочно" is a deadline he has not named, "важно" is a preference,
+// and a third shade of urgent would be a distinction he never makes out loud.
+var urgencyMarkers = []struct {
+	word   string
+	weight int
+}{
+	{"срочно", 3},
+	{"urgent", 3},
+	{"важно", 2},
+	{"important", 2},
+}
+
 // ParseTaskCapture reports whether an utterance explicitly files a task, and
 // returns the task text with the marker stripped. A marker with nothing after it
 // is not a capture (there is no task in "добавь в задачи") — the caller falls
 // through to whatever it would otherwise have done with the turn.
-func ParseTaskCapture(text string) (string, bool) {
+func ParseTaskCapture(text string) (TaskCapture, bool) {
 	trimmed := strings.TrimSpace(text)
 	lower := strings.ToLower(trimmed)
 	best := ""
@@ -52,7 +74,7 @@ func ParseTaskCapture(text string) (string, bool) {
 		}
 	}
 	if best == "" {
-		return "", false
+		return TaskCapture{}, false
 	}
 	// Cut on the rune length of the matched prefix. ToLower does not change the
 	// byte length of Russian or English letters, so the index carries over.
@@ -60,10 +82,35 @@ func ParseTaskCapture(text string) (string, bool) {
 	rest = strings.TrimLeft(rest, ":—- ")
 	rest = strings.TrimSpace(rest)
 	rest = strings.TrimRight(rest, ".!")
+	rest, weight := stripUrgency(rest)
 	if rest == "" {
-		return "", false
+		return TaskCapture{}, false
 	}
-	return rest, true
+	return TaskCapture{Text: rest, Weight: weight}, true
+}
+
+// stripUrgency pulls a leading or trailing urgency word out of the task text
+// and returns the weight it implies. Only at the edges: "срочно оплатить
+// интернет" and "оплатить интернет срочно" are the same instruction, while
+// "позвонить в срочную помощь" is a task whose text happens to contain the
+// stem, and cutting a word out of the middle of it would mangle the task.
+//
+// The word is removed from the text, because the list should read "оплатить
+// интернет (важно)" and not "важно оплатить интернет (важно)".
+func stripUrgency(text string) (string, int) {
+	for _, m := range urgencyMarkers {
+		lower := strings.ToLower(text)
+		switch {
+		case strings.HasPrefix(lower, m.word+" "):
+			return strings.TrimSpace(text[len(m.word):]), m.weight
+		case strings.HasSuffix(lower, " "+m.word):
+			return strings.TrimSpace(text[:len(text)-len(m.word)]), m.weight
+		case lower == m.word:
+			// Nothing but the marker — no task in it.
+			return "", 0
+		}
+	}
+	return text, 0
 }
 
 // taskListWords — the nouns that make a question be about the task list.