feat: add agentsview cost estimate to roborev queue view

internal/tokens now prefers `agentsview session usage <id> --format
json` on agentsview >= 0.30.0 and falls back to the deprecated
`token-use` on 0.15.0-0.29.x, selected via a capability probe. It
parses the new cost_usd/has_cost fields into Usage.

Usage exit codes 2 (session not found) and 3 (no token/cost data) are
treated as "no usage" rather than errors; the legacy token-use exit-1
empty-output case is still handled for older agentsview.

FormatSummary appends "· ~$0.42" when a cost estimate is present (the
review detail view picks this up automatically); FormatCost returns the
cost alone. The TUI queue gains a default-visible "Cost" column showing
the per-job estimate, blank when unpriced or not yet fetched.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: wesm

cmd/roborev/tui/queue_test.go

@@ -631,6 +631,53 @@ func TestTUIJobCellsReviewTypeTag(t *testing.T) {
 	}
 }
 
+func TestTUIJobCellsCost(t *testing.T) {
+	m := model{width: 200}
+	// cells[k] maps to logical column colRef+k (see jobCells copy),
+	// so the cost cell is at colCost-colRef.
+	costIdx := colCost - colRef
+
+	t.Run("priced cost renders", func(t *testing.T) {
+		job := makeJob(1)
+		job.TokenUsage = `{"total_output_tokens":28800,` +
+			`"peak_context_tokens":118000,"cost_usd":0.42,"has_cost":true}`
+		cells := m.jobCells(job)
+		assert.Equal(t, "~$0.42", cells[costIdx])
+	})
+
+	t.Run("no usage blank", func(t *testing.T) {
+		cells := m.jobCells(makeJob(1))
+		assert.Empty(t, cells[costIdx])
+	})
+
+	t.Run("unpriced tokens blank", func(t *testing.T) {
+		job := makeJob(1)
+		job.TokenUsage = `{"total_output_tokens":28800,` +
+			`"peak_context_tokens":118000,"has_cost":false}`
+		cells := m.jobCells(job)
+		assert.Empty(t, cells[costIdx])
+	})
+}
+
+func TestTUIQueueShowsCostColumnByDefault(t *testing.T) {
+	m := newModel(localhostEndpoint, withExternalIODisabled())
+	m.width = 200
+	m.height = 30
+	job := makeJob(1, withRef("abc1234"),
+		withRepoName("repo"), withAgent("test"))
+	job.TokenUsage = `{"total_output_tokens":28800,` +
+		`"peak_context_tokens":118000,"cost_usd":0.42,"has_cost":true}`
+	m.jobs = []storage.ReviewJob{job}
+	m.selectedIdx = 0
+	m.selectedJobID = 1
+
+	out := stripTestANSI(m.renderQueueView())
+	assert.Contains(t, out, "Cost",
+		"Cost header should be visible by default")
+	assert.Contains(t, out, "~$0.42",
+		"cost value should render in the row")
+}
+
 func TestTUIQueueTableRendersWithinWidth(t *testing.T) {
 
 	widths := []int{80, 100, 120, 200}

cmd/roborev/tui/render_queue.go

@@ -13,6 +13,7 @@ import (
 	"go.kenn.io/roborev/internal/agent"
 	"go.kenn.io/roborev/internal/config"
 	"go.kenn.io/roborev/internal/storage"
+	"go.kenn.io/roborev/internal/tokens"
 	"go.kenn.io/roborev/internal/version"
 )
 
@@ -119,6 +120,7 @@ const (
 	colSessionID                // Session ID
 	colRequestedModel           // Explicitly requested model
 	colRequestedProvider        // Explicitly requested provider
+	colCost                     // Cost estimate (USD)
 	colCount                    // total number of columns
 )
 
@@ -268,7 +270,7 @@ func (m model) renderQueueView() string {
 		visCols := m.visibleColumns()
 
 		// Compute per-column max content widths, using cache when data hasn't changed.
-		allHeaders := [colCount]string{"", "JobID", "Ref", "Branch", "Repo", "Agent", "Queued", "Elapsed", "Status", "P/F", "Closed", "Session", "Req Model", "Req Provider"}
+		allHeaders := [colCount]string{"", "JobID", "Ref", "Branch", "Repo", "Agent", "Queued", "Elapsed", "Status", "P/F", "Closed", "Session", "Req Model", "Req Provider", "Cost"}
 		allFullRows := make([][]string, len(visibleJobList))
 		for i, job := range visibleJobList {
 			cells := m.jobCells(job)
@@ -327,6 +329,7 @@ func (m model) renderQueueView() string {
 			colSessionID:         min(max(contentWidth[colSessionID], 7), 12),          // "Session" header = 7, cap at 12
 			colRequestedModel:    min(max(contentWidth[colRequestedModel], 9), 24),     // "Req Model" header = 9
 			colRequestedProvider: min(max(contentWidth[colRequestedProvider], 12), 24), // "Req Provider" header = 12
+			colCost:              max(contentWidth[colCost], 4),                        // "Cost" header = 4
 		}
 
 		// Flexible columns absorb excess space
@@ -613,7 +616,7 @@ func (m model) renderQueueView() string {
 
 // jobCells returns plain text cell values for a job row.
 // Order: ref, branch, repo, agent, queued, elapsed, status, pf, handled,
-// session, requested model, requested provider.
+// session, requested model, requested provider, cost.
 func (m model) jobCells(job storage.ReviewJob) []string {
 	ref := shortJobRef(job)
 	if !config.IsDefaultReviewType(job.ReviewType) {
@@ -667,7 +670,15 @@ func (m model) jobCells(job storage.ReviewJob) []string {
 	requestedModel := stripControlChars(job.RequestedModel)
 	requestedProvider := stripControlChars(job.RequestedProvider)
 
-	return []string{ref, branch, repo, agentName, enqueued, elapsed, status, verdict, handled, sessionID, requestedModel, requestedProvider}
+	// Cost estimate from the stored agentsview usage blob; blank when
+	// no priced estimate is available (old agentsview, unpriced model,
+	// or usage not yet fetched for a running/queued job).
+	cost := ""
+	if tu := tokens.ParseJSON(job.TokenUsage); tu != nil {
+		cost = tu.FormatCost()
+	}
+
+	return []string{ref, branch, repo, agentName, enqueued, elapsed, status, verdict, handled, sessionID, requestedModel, requestedProvider, cost}
 }
 
 // statusLabel returns a capitalized display label for the job status.
@@ -840,7 +851,7 @@ func migrateColumnConfig(cfg *config.Config) bool {
 
 // toggleableColumns is the ordered list of columns the user can show/hide.
 // colSel and colJobID are always visible and not included here.
-var toggleableColumns = []int{colRef, colBranch, colRepo, colAgent, colQueued, colElapsed, colStatus, colPF, colHandled, colSessionID, colRequestedModel, colRequestedProvider}
+var toggleableColumns = []int{colRef, colBranch, colRepo, colAgent, colQueued, colElapsed, colStatus, colPF, colHandled, colCost, colSessionID, colRequestedModel, colRequestedProvider}
 
 // columnNames maps column constants to display names.
 var columnNames = map[int]string{
@@ -856,6 +867,7 @@ var columnNames = map[int]string{
 	colSessionID:         "Session",
 	colRequestedModel:    "Req Model",
 	colRequestedProvider: "Req Provider",
+	colCost:              "Cost",
 }
 
 // columnConfigNames maps column constants to config file names (lowercase).
@@ -872,6 +884,7 @@ var columnConfigNames = map[int]string{
 	colSessionID:         "session_id",
 	colRequestedModel:    "requested_model",
 	colRequestedProvider: "requested_provider",
+	colCost:              "cost",
 }
 
 // drainFlexOverflow reduces flex column widths to absorb overflow,