feat(recovery,context): tier-2 intent-holder arbiter + remaining-delta pinning + surfaced signal events

- recovery: two-tier repair ladder — owner then arbiter (recovery stage recast
  as intent-holder, holds initial intent, reconciles cross-file contract disputes)
  with independent INTENT_ROUTE_BUDGET; RecoveryRoutingTest coverage
- context: remaining-delta checklist pinning (RemainingDelta{Pinning,Entry}Test)
- surface write-only events (session name, quality signals) into stats/browse
- parseToolArguments lenient-Json fallback for bare-key drift
- tools: ChildProcess seam

apps/tui-go/internal/protocol/protocol.go

@@ -36,6 +36,7 @@ const (
 	TypeApprovalResolved = "approval.resolved"
 	TypeClarification    = "clarification.required"
 	TypeWorkflowProposed = "workflow.proposed"
+	TypeSessionRenamed   = "session.renamed"
 	TypeWorkspaceBound   = "session.workspace_bound"
 	TypeStageManifest    = "stage.tool_manifest"
 	TypeProviderStatus   = "provider.status_changed"
@@ -70,30 +71,34 @@ const (
 type ServerMessage struct {
 	Type string `json:"type"`
 
-	SessionID     string  `json:"sessionId"`
-	WorkflowID    string  `json:"workflowId"`
-	StageID       string  `json:"stageId"`
-	ToolName      string  `json:"toolName"`
-	Role          string  `json:"role"`
-	TurnID        string  `json:"turnId"`
-	Reason        string  `json:"reason"`
-	Summary       string  `json:"outputSummary"`
-	Response      string  `json:"responseText"`
-	LastOutput    string  `json:"lastOutput"`   // session_snapshot: last stage output (reopen)
-	LastResponse  string  `json:"lastResponse"` // session_snapshot: last stage response (reopen)
-	Content       string  `json:"content"`
-	Diff          *string `json:"diff"`
+	SessionID    string  `json:"sessionId"`
+	WorkflowID   string  `json:"workflowId"`
+	StageID      string  `json:"stageId"`
+	ToolName     string  `json:"toolName"`
+	Role         string  `json:"role"`
+	TurnID       string  `json:"turnId"`
+	Reason       string  `json:"reason"`
+	Summary      string  `json:"outputSummary"`
+	Response     string  `json:"responseText"`
+	Reasoning    string  `json:"reasoning"`    // inference.completed: model thinking trace (collapsed view)
+	LastOutput   string  `json:"lastOutput"`   // session_snapshot: last stage output (reopen)
+	LastResponse string  `json:"lastResponse"` // session_snapshot: last stage response (reopen)
+	Content      string  `json:"content"`
+	Diff         *string `json:"diff"`
 	// tool.completed: file/dir path(s) the tool read, wrote, or listed.
 	AffectedEntities []string `json:"affectedEntities"`
-	Tier             string   `json:"tier"`
-	Message       string  `json:"message"`
-	RequestID     string  `json:"requestId"`
-	ArtifactID    string  `json:"artifactId"`
-	ProviderID    string  `json:"providerId"`
-	Preview       *string `json:"preview"`
-	Disposition   string  `json:"disposition"`
-	Outcome       string  `json:"outcome"`       // approval.resolved: APPROVED | REJECTED | AUTO_APPROVED
-	WorkspaceRoot string  `json:"workspaceRoot"` // session.workspace_bound: the bound cwd
+	// tool.started: pretty "key=value" call arguments (path=…, command="…").
+	Params        []string `json:"params"`
+	Tier          string   `json:"tier"`
+	Message       string   `json:"message"`
+	RequestID     string   `json:"requestId"`
+	ArtifactID    string   `json:"artifactId"`
+	ProviderID    string   `json:"providerId"`
+	Preview       *string  `json:"preview"`
+	Disposition   string   `json:"disposition"`
+	Outcome       string   `json:"outcome"`       // approval.resolved: APPROVED | REJECTED | AUTO_APPROVED
+	WorkspaceRoot string   `json:"workspaceRoot"` // session.workspace_bound: the bound cwd
+	Name          string   `json:"name"`          // session.renamed: human title derived from intent
 
 	// plan.locked: the compiled phase-2 stage ids in execution order
 	StageIDs []string `json:"stageIds"`
@@ -134,6 +139,7 @@ type ServerMessage struct {
 	PendingAppr    []ApprovalDto      `json:"pendingApprovals"`
 	Tools          []ToolRecordDto    `json:"tools"`
 	RecentEvents   []EventEntryDto    `json:"recentEvents"`
+	Transcript     []TranscriptRowDto `json:"transcript"`
 	Stages         []StageToolDecl    `json:"stages"`
 	Workflows      []WorkflowDto      `json:"workflows"`
 	AssessedIssues []AssessedIssueDto `json:"issues"`
@@ -387,6 +393,22 @@ type ToolRecordDto struct {
 	Diff   *string `json:"diff"`
 }
 
+// TranscriptRowDto is one raw OUTPUT-transcript source row from a session_snapshot; the client
+// folds these into RouterEntry rows on reopen, applying its own diff/param/action formatting.
+type TranscriptRowDto struct {
+	Kind             string   `json:"kind"`
+	Role             string   `json:"role"`
+	Content          string   `json:"content"`
+	ToolName         string   `json:"toolName"`
+	Status           string   `json:"status"`
+	Diff             *string  `json:"diff"`
+	Params           []string `json:"params"`
+	Summary          string   `json:"summary"`
+	AffectedEntities []string `json:"affectedEntities"`
+	LatencyMs        *int64   `json:"latencyMs"`
+	TotalTokens      *int     `json:"totalTokens"`
+}
+
 type WorkflowDto struct {
 	WorkflowID  string `json:"workflowId"`
 	Description string `json:"description"`
@@ -413,7 +435,7 @@ func (m ServerMessage) IsEventBearing() bool {
 		TypeToolAssessed,
 		TypeApprovalRequired, TypeApprovalResolved, TypeClarification,
 		TypeWorkflowProposed,
-		TypeWorkspaceBound, TypeArtifactCreated,
+		TypeSessionRenamed, TypeWorkspaceBound, TypeArtifactCreated,
 		TypeArtifactValid, TypePlanLocked,
 		TypeRouterNarration, TypeReviewFindings:
 		return true