feat(tui-go): workflow-propose choice panel

Render a workflow.proposed frame as a single-select picker with a manual-answer
slot: ↑↓/jk to choose, enter to launch, e for custom, esc to peek away. Picking
a candidate sends StartSession (and focuses the launched session); the custom
slot continues the conversation via ChatInput. Reuses the modal helpers from the
clarification view.

apps/tui-go/internal/app/model.go

@@ -13,6 +13,7 @@ const (
 	StateInSession
 	StateApproval
 	StateClarification
+	StateWorkflowPropose
 )
 
 // InputMode toggles what a submitted line targets.
@@ -125,6 +126,23 @@ type Clarification struct {
 	Questions []ClarQuestion
 }
 
+// ProposeCandidate is one workflow the router suggests (mirrors the wire DTO).
+type ProposeCandidate struct {
+	WorkflowID string
+	Reason     string
+}
+
+// Proposal is the router's triage suggestion of candidate workflows for a chat
+// request, rendered as a choice panel with a manual-answer slot. Picking a candidate
+// launches that workflow; the custom slot continues the conversation.
+type Proposal struct {
+	ProposalID      string
+	SessionID       string
+	Prompt          string
+	OriginalRequest string
+	Candidates      []ProposeCandidate
+}
+
 // Session is the UI's view of one server session.
 type Session struct {
 	ID            string
@@ -141,6 +159,7 @@ type Session struct {
 	Events        []EventEntry
 	Pending       *Approval
 	Clar          *Clarification // open questions awaiting answers (clarification view)
+	Propose       *Proposal      // router workflow suggestion awaiting a pick (propose view)
 	Active        bool           // an inference/tool is in flight (drives the spinner)
 }
 
@@ -256,6 +275,12 @@ type Model struct {
 	clarText      []string       // per-question free-text / custom answer
 	clarTyping    bool           // typing into the custom buffer for the focused question
 	clarDismissed bool           // peeked away from the form (it can be reopened)
+
+	// workflow-propose view (the router's candidate-workflow picker)
+	proposeCursor    int    // cursor over candidates (== len(candidates) → custom slot)
+	proposeText      string // free-text answer typed into the custom slot
+	proposeTyping    bool   // typing into the custom buffer
+	proposeDismissed bool   // peeked away from the picker (it can be reopened)
 }
 
 // NewModel builds the initial idle state.
@@ -290,6 +315,10 @@ func (m Model) displayState() DisplayState {
 	if s != nil && s.Clar != nil && !m.clarDismissed {
 		return StateClarification
 	}
+	// A router workflow proposal is the operator's call to make before chatting on.
+	if s != nil && s.Propose != nil && !m.proposeDismissed {
+		return StateWorkflowPropose
+	}
 	if m.approvalDismissed {
 		return StateInSession
 	}

apps/tui-go/internal/app/proposecard.go

@@ -0,0 +1,171 @@
+package app
+
+import (
+	"strings"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+	"github.com/correx/tui-go/internal/protocol"
+)
+
+// proposecard.go renders and drives the workflow-propose view: the router's triage
+// suggestion of candidate workflows, presented as a single-select picker with a
+// manual-answer slot (like a choice panel). Picking a candidate launches that
+// workflow seeded with the original request; the custom slot continues the chat.
+
+// --- widget state ---
+
+func (m *Model) proposeInitState() {
+	m.proposeCursor = 0
+	m.proposeText = ""
+	m.proposeTyping = false
+	m.proposeDismissed = false
+}
+
+// --- key handling ---
+
+func (m Model) handleProposeKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
+	s := m.session(m.selectedID)
+	if s == nil || s.Propose == nil {
+		return m, nil
+	}
+	if m.proposeTyping {
+		return m.handleProposeTyping(k)
+	}
+	n := len(s.Propose.Candidates) // index n == the custom slot
+	switch k.Type {
+	case tea.KeyEsc:
+		m.proposeDismissed = true
+	case tea.KeyUp:
+		m.proposeCursor = clampInt(m.proposeCursor-1, 0, n)
+	case tea.KeyDown:
+		m.proposeCursor = clampInt(m.proposeCursor+1, 0, n)
+	case tea.KeyEnter, tea.KeySpace:
+		return m.proposeSubmit()
+	case tea.KeyRunes:
+		switch string(k.Runes) {
+		case "k":
+			m.proposeCursor = clampInt(m.proposeCursor-1, 0, n)
+		case "j":
+			m.proposeCursor = clampInt(m.proposeCursor+1, 0, n)
+		case "e":
+			m.proposeCursor = n // jump to the custom slot and start typing
+			m.proposeTyping = true
+		}
+	}
+	return m, nil
+}
+
+func (m Model) handleProposeTyping(k tea.KeyMsg) (tea.Model, tea.Cmd) {
+	switch k.Type {
+	case tea.KeyEsc:
+		m.proposeTyping = false
+	case tea.KeyEnter:
+		return m.proposeSubmit() // commit the custom answer and send it as chat
+	case tea.KeyBackspace:
+		if len(m.proposeText) > 0 {
+			m.proposeText = m.proposeText[:len(m.proposeText)-1]
+		}
+	case tea.KeyRunes, tea.KeySpace:
+		m.proposeText += string(k.Runes)
+	}
+	return m, nil
+}
+
+// proposeSubmit acts on the focused row: a candidate launches its workflow (seeded
+// with the original request); the custom slot continues the conversation as a chat
+// turn. An empty custom slot just drops into typing rather than submitting nothing.
+func (m Model) proposeSubmit() (tea.Model, tea.Cmd) {
+	s := m.session(m.selectedID)
+	if s == nil || s.Propose == nil {
+		return m, nil
+	}
+	p := s.Propose
+	if m.proposeCursor >= len(p.Candidates) {
+		text := strings.TrimSpace(m.proposeText)
+		if text == "" {
+			m.proposeTyping = true
+			return m, nil
+		}
+		m.client.Send(protocol.ChatInput(p.SessionID, text, "CHAT"))
+		s.Propose = nil
+		m.proposeInitState()
+		return m, nil
+	}
+	pick := p.Candidates[m.proposeCursor]
+	m.client.Send(protocol.StartSession(pick.WorkflowID, p.OriginalRequest))
+	m.pendingWorkflowFocus = true // focus the launched session when it announces
+	s.Propose = nil
+	m.proposeInitState()
+	return m, nil
+}
+
+// --- rendering ---
+
+func (m Model) proposeModal() string {
+	t := m.theme
+	w := m.modalWidth()
+	s := m.session(m.selectedID)
+	if s == nil || s.Propose == nil {
+		return ""
+	}
+	p := s.Propose
+
+	var b strings.Builder
+	b.WriteString(m.titleLine("workflow suggestion") + "\n")
+	if p.OriginalRequest != "" {
+		b.WriteString(mbg(t, "  for: "+p.OriginalRequest, t.P.Faint) + "\n")
+	}
+	if p.Prompt != "" {
+		b.WriteString(mbg(t, "  "+p.Prompt, t.P.Fg) + "\n")
+	}
+	b.WriteString("\n")
+
+	contentW := w - 6
+	for i, c := range p.Candidates {
+		b.WriteString(m.proposeRow(c, i == m.proposeCursor, contentW) + "\n")
+	}
+	b.WriteString(m.proposeCustomRow(m.proposeCursor >= len(p.Candidates), contentW) + "\n")
+
+	b.WriteString("\n" + modalHints(t, [][2]string{
+		{"↑↓", "choose"}, {"enter", "launch"}, {"e", "custom"}, {"esc", "later"},
+	}))
+	return t.Overlay.Width(w).Render(b.String())
+}
+
+// proposeRow renders one candidate workflow: a focus marker, the [workflow-id] chip,
+// and its reason.
+func (m Model) proposeRow(c ProposeCandidate, focused bool, w int) string {
+	t := m.theme
+	marker := mbg(t, "  ", t.P.BgPanel)
+	reasonFg := t.P.Dim
+	if focused {
+		marker = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▸ ")
+		reasonFg = t.P.Fg
+	}
+	line := marker + lipgloss.NewStyle().Foreground(t.P.Accent2).Background(t.P.BgPanel).Render("["+c.WorkflowID+"]")
+	if c.Reason != "" {
+		line += mbg(t, " "+c.Reason, reasonFg)
+	}
+	return clip(line, w)
+}
+
+// proposeCustomRow renders the manual-answer slot: a prompt when empty, the typed
+// text (with a caret while editing) otherwise.
+func (m Model) proposeCustomRow(focused bool, w int) string {
+	t := m.theme
+	marker := mbg(t, "  ", t.P.BgPanel)
+	fg := t.P.Dim
+	if focused {
+		marker = lipgloss.NewStyle().Foreground(t.P.Accent).Background(t.P.BgPanel).Render("▸ ")
+		fg = t.P.Fg
+	}
+	label := "✎ something else…"
+	switch {
+	case m.proposeTyping:
+		label = "✎ " + m.proposeText + "▏"
+	case strings.TrimSpace(m.proposeText) != "":
+		label = "✎ " + m.proposeText
+	}
+	return clip(marker+lipgloss.NewStyle().Foreground(fg).Background(t.P.BgPanel).Render(label), w)
+}

apps/tui-go/internal/app/proposecard_test.go

@@ -0,0 +1,142 @@
+package app
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/correx/tui-go/internal/protocol"
+	"github.com/correx/tui-go/internal/ws"
+)
+
+func proposeModel() (Model, *ws.Client) {
+	client := ws.New("", 0) // unconnected; Send just buffers, Drain reads it back
+	m := NewModel(client)
+	m.width, m.height = 120, 40
+	m.theme = NewTheme(SoftBlue)
+	m.selectedID = "s1"
+	m.sessionEntered = true
+	m.applyServer(protocol.ServerMessage{
+		Type:            protocol.TypeWorkflowProposed,
+		SessionID:       "s1",
+		ProposalID:      "prop-1",
+		Prompt:          "Run one of these?",
+		OriginalRequest: "find papers on event sourcing",
+		Candidates: []protocol.ProposedWorkflowDto{
+			{WorkflowID: "research", Reason: "gather + report"},
+			{WorkflowID: "role_pipeline", Reason: "full build"},
+		},
+	})
+	return m, client
+}
+
+func TestProposeEntersStateAndRenders(t *testing.T) {
+	m, _ := proposeModel()
+	if m.displayState() != StateWorkflowPropose {
+		t.Fatalf("want StateWorkflowPropose, got %v", m.displayState())
+	}
+	out := m.proposeModal()
+	for _, want := range []string{"workflow suggestion", "Run one of these?", "research", "gather + report", "role_pipeline", "something else"} {
+		if !strings.Contains(out, want) {
+			t.Fatalf("modal missing %q:\n%s", want, out)
+		}
+	}
+}
+
+func TestProposePickLaunchesChosenWorkflow(t *testing.T) {
+	m, client := proposeModel()
+	// move cursor to the second candidate (role_pipeline) and launch it
+	m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyDown})
+	m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyEnter})
+
+	if s := m.session("s1"); s == nil || s.Propose != nil {
+		t.Fatalf("expected proposal cleared after launch")
+	}
+	if !m.pendingWorkflowFocus {
+		t.Fatalf("expected pendingWorkflowFocus set so the launched session is focused")
+	}
+	wf, input := decodeStart(t, client)
+	if wf != "role_pipeline" {
+		t.Fatalf("launched wrong workflow: %q", wf)
+	}
+	if input != "find papers on event sourcing" {
+		t.Fatalf("workflow not seeded with original request: %q", input)
+	}
+}
+
+func TestProposeFirstCandidateIsDefault(t *testing.T) {
+	m, client := proposeModel()
+	m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyEnter}) // no nav → first candidate
+	wf, _ := decodeStart(t, client)
+	if wf != "research" {
+		t.Fatalf("expected first candidate launched by default, got %q", wf)
+	}
+}
+
+func TestProposeCustomAnswerContinuesChat(t *testing.T) {
+	m, client := proposeModel()
+	m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune("e")})
+	if !m.proposeTyping {
+		t.Fatalf("expected typing mode after 'e'")
+	}
+	for _, r := range "do it manually" {
+		m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyRunes, Runes: []rune{r}})
+	}
+	m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyEnter})
+
+	if s := m.session("s1"); s == nil || s.Propose != nil {
+		t.Fatalf("expected proposal cleared after custom answer")
+	}
+	if m.pendingWorkflowFocus {
+		t.Fatalf("a custom answer must not launch a workflow")
+	}
+	frames := client.Drain()
+	if len(frames) != 1 {
+		t.Fatalf("expected exactly one frame, got %d", len(frames))
+	}
+	var raw map[string]any
+	if err := json.Unmarshal(frames[0], &raw); err != nil {
+		t.Fatalf("unmarshal: %v", err)
+	}
+	if raw["type"] != "com.correx.apps.server.protocol.ClientMessage.ChatInput" {
+		t.Fatalf("expected ChatInput, got %v", raw["type"])
+	}
+	if raw["text"] != "do it manually" {
+		t.Fatalf("custom text not sent: %v", raw["text"])
+	}
+}
+
+func TestProposeEscDismisses(t *testing.T) {
+	m, _ := proposeModel()
+	m = applyProposeKey(m, tea.KeyMsg{Type: tea.KeyEsc})
+	if m.displayState() != StateInSession {
+		t.Fatalf("expected StateInSession after esc, got %v", m.displayState())
+	}
+	if s := m.session("s1"); s == nil || s.Propose == nil {
+		t.Fatalf("esc should peek away, not discard the proposal")
+	}
+}
+
+func applyProposeKey(m Model, k tea.KeyMsg) Model {
+	updated, _ := m.handleProposeKey(k)
+	return updated.(Model)
+}
+
+func decodeStart(t *testing.T, client *ws.Client) (workflowID, input string) {
+	t.Helper()
+	frames := client.Drain()
+	if len(frames) != 1 {
+		t.Fatalf("expected exactly one frame, got %d", len(frames))
+	}
+	var raw map[string]any
+	if err := json.Unmarshal(frames[0], &raw); err != nil {
+		t.Fatalf("unmarshal: %v", err)
+	}
+	if raw["type"] != "com.correx.apps.server.protocol.ClientMessage.StartSession" {
+		t.Fatalf("expected StartSession, got %v", raw["type"])
+	}
+	wf, _ := raw["workflowId"].(string)
+	in, _ := raw["input"].(string)
+	return wf, in
+}

apps/tui-go/internal/app/server.go

@@ -133,12 +133,14 @@ func (m *Model) applyServer(msg protocol.ServerMessage) {
 		if s := m.session(msg.SessionID); s != nil {
 			s.Active = false
 			s.Clar = nil
+			s.Propose = nil
 		}
 	case protocol.TypeSessionFailed:
 		m.touch(msg.SessionID, "FAILED")
 		if s := m.session(msg.SessionID); s != nil {
 			s.Active = false
 			s.Clar = nil
+			s.Propose = nil
 		}
 	case protocol.TypeStageStarted:
 		if s := m.session(msg.SessionID); s != nil {
@@ -246,6 +248,8 @@ func (m *Model) applyServer(msg protocol.ServerMessage) {
 		m.onApprovalRequired(msg)
 	case protocol.TypeClarification:
 		m.onClarificationRequired(msg)
+	case protocol.TypeWorkflowProposed:
+		m.onWorkflowProposed(msg)
 	case protocol.TypeApprovalResolved:
 		if s := m.session(msg.SessionID); s != nil {
 			s.Pending = nil
@@ -424,6 +428,23 @@ func (m *Model) onClarificationRequired(msg protocol.ServerMessage) {
 	}
 }
 
+func (m *Model) onWorkflowProposed(msg protocol.ServerMessage) {
+	cands := make([]ProposeCandidate, 0, len(msg.Candidates))
+	for _, c := range msg.Candidates {
+		cands = append(cands, ProposeCandidate{WorkflowID: c.WorkflowID, Reason: c.Reason})
+	}
+	p := &Proposal{
+		ProposalID: msg.ProposalID, SessionID: msg.SessionID,
+		Prompt: msg.Prompt, OriginalRequest: msg.OriginalRequest, Candidates: cands,
+	}
+	if s := m.session(msg.SessionID); s != nil {
+		s.Propose = p
+	}
+	if msg.SessionID == m.selectedID {
+		m.proposeInitState()
+	}
+}
+
 func (m *Model) onSnapshot(msg protocol.ServerMessage) {
 	var pending *Approval
 	if len(msg.PendingAppr) > 0 {

apps/tui-go/internal/app/update.go

@@ -108,6 +108,9 @@ func (m Model) handleKey(k tea.KeyMsg) (tea.Model, tea.Cmd) {
 		m.clarEnsureState()
 		return m.handleClarificationKey(k)
 	}
+	if m.displayState() == StateWorkflowPropose {
+		return m.handleProposeKey(k)
+	}
 	if m.editMode == ModeInsert {
 		return m.handleInsertKey(k)
 	}

apps/tui-go/internal/app/view.go

@@ -58,6 +58,9 @@ func (m Model) View() string {
 	if m.displayState() == StateClarification {
 		return m.center(m.clarificationModal())
 	}
+	if m.displayState() == StateWorkflowPropose {
+		return m.center(m.proposeModal())
+	}
 	if m.overlay != OverlayNone {
 		return m.renderOverlay(base)
 	}
@@ -224,6 +227,9 @@ func (m Model) renderFooter() string {
 	case m.displayState() == StateClarification:
 		// The question form owns its keys; the footer mirrors the essentials.
 		hints = []string{hint("←→", "option"), hint("↑↓", "question"), hint("spc", "select"), hint("enter", "submit"), hint("esc", "later")}
+	case m.displayState() == StateWorkflowPropose:
+		// The picker owns its keys; the footer mirrors the essentials.
+		hints = []string{hint("↑↓", "choose"), hint("enter", "launch"), hint("e", "custom"), hint("esc", "later")}
 	case m.displayState() == StateIdle:
 		if nrw {
 			hints = []string{hint("i", "name"), hint("/", "filter"), hint("w", "wf"), hint("p", "cmds"), hint("q", "quit")}