Revert "Reduce typing latency in large busy workspaces" (#7863)

Packages/Shared/CmuxAgentChat/Tests/CmuxAgentChatTests/Resources/ArtifactParity/codex-adversarial.jsonl

@@ -16,3 +16,4 @@
 {"timestamp":"2026-07-13T12:00:00.000Z","type":"event_msg","payload":{"type":"agent_message","message":"Event-only prose /tmp/parity/CODEX-event-agent.png","phase":"commentary"}}
 {"timestamp":"2026-07-13T12:00:00.000Z","type":"event_msg","payload":{"type":"exec_command_begin","call_id":"event-exec","command":"cat /tmp/parity/CODEX-event-command.txt"}}
 {"timestamp":"2026-07-13T12:00:00.000Z","type":"event_msg","payload":{"type":"exec_command_end","call_id":"event-exec","stdout":"saved /tmp/parity/CODEX-event-output.txt","stderr":"","exit_code":0}}
+

Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Coordinator/ControlCommandContext.swift

@@ -28,7 +28,6 @@ public protocol ControlCommandContext:
     ControlSurfaceContext,
     ControlSystemContext,
     ControlProjectContext,
-    ControlPerformanceContext,
     ControlDebugContext,
     ControlSidebarContext,
     ControlBrowserPanelContext

Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Coordinator/ControlCommandCoordinator.swift

@@ -81,7 +81,6 @@ public final class ControlCommandCoordinator {
         if let result = handleSurface(request) { return result }
         if let result = handleSystem(request) { return result }
         if let result = handleProject(request) { return result }
-        if let result = handlePerformance(request) { return result }
         if let result = handleDebug(request) { return result }
         // The v2 browser.* domain stays app-side: PR 5778 moved its
         // JS-evaluating methods onto the socket-worker lane (nonisolated

Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Coordinator/Debug/ControlDebugContext.swift

@@ -38,13 +38,6 @@ public protocol ControlDebugContext: AnyObject {
     ///   unavailable (the legacy `unavailable` error).
     func controlDebugSessionSnapshotSeedScrollback(charactersPerTerminal: Int) -> JSONValue?
 
-    /// Reads the DEBUG-only process enumeration, filtering, apply, and lsof
-    /// counters without mutating app or focus state.
-    func controlDebugReadProcessPerformanceMetrics() -> JSONValue?
-
-    /// Resets the DEBUG-only process counters and returns the zeroed snapshot.
-    func controlDebugResetProcessPerformanceMetrics() -> JSONValue?
-
     // MARK: - v1-shared command forwards (raw v1 response strings)
 
     /// Runs the shared v1 `set_shortcut` body for `debug.shortcut.set`.

Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Transport/SocketClientAuthorization.swift

@@ -1,10 +1,8 @@
 public import Darwin
 
-/// Authorizes one peer connection for cmux-only control socket requests.
-public struct SocketClientAuthorization: Sendable {
-    private var cachedAncestryAuthorization: (peerProcessID: pid_t, isAllowed: Bool)?
-
-    /// Creates an authorization helper for one accepted socket connection.
+/// Authorizes peer processes for cmux-only control socket requests.
+public struct SocketClientAuthorization {
+    /// Creates an authorization helper with no retained process state.
     public init() {}
 
     /// Returns whether a peer process is allowed to use cmux-only socket operations.
@@ -31,36 +29,11 @@ public struct SocketClientAuthorization: Sendable {
         return false
     }
 
-    /// Evaluates and caches process ancestry for one peer PID.
-    ///
-    /// Call this when connection admission must fall back to ancestry before
-    /// the first command is available. Later command authorization reuses the
-    /// cached result and does not walk the process tree again.
-    ///
-    /// - Parameters:
-    ///   - peerProcessID: The PID reported by the accepted socket.
-    ///   - isDescendant: Predicate that verifies current process ancestry.
-    /// - Returns: The cached or newly evaluated ancestry result.
-    public mutating func cacheAncestryAuthorization(
-        peerProcessID: pid_t?,
-        isDescendant: (pid_t) -> Bool
-    ) -> Bool {
-        guard let peerProcessID else { return false }
-        if let cachedAncestryAuthorization,
-           cachedAncestryAuthorization.peerProcessID == peerProcessID {
-            return cachedAncestryAuthorization.isAllowed
-        }
-        let peerIsDescendant = isDescendant(peerProcessID)
-        cachedAncestryAuthorization = (peerProcessID, peerIsDescendant)
-        return peerIsDescendant
-    }
-
     /// Returns the command carried by an authorized cmux-only request.
     ///
-    /// A valid same-user capability is accepted before process ancestry is
-    /// evaluated. Ordinary clients retain process-tree authorization, with one
-    /// ancestry result cached for the lifetime of this authorization helper.
-    /// Reusing a helper with a different peer PID invalidates that cache.
+    /// Descendants retain the existing process-tree authorization. The
+    /// capability parameters form the runtime seam for terminals whose
+    /// process trees are later reparented by a multiplexer.
     ///
     /// - Parameters:
     ///   - command: The raw command line received from the client.
@@ -69,24 +42,22 @@ public struct SocketClientAuthorization: Sendable {
     ///   - capabilityAuthority: The authority that verifies inherited tokens.
     ///   - isDescendant: Predicate that verifies current process ancestry.
     /// - Returns: The unwrapped command when authorized, otherwise `nil`.
-    public mutating func authorizedCommand(
+    public func authorizedCommand(
         _ command: String,
         peerProcessID: pid_t?,
         peerHasSameUID: Bool,
         capabilityAuthority: SocketClientCapabilityAuthority,
         isDescendant: (pid_t) -> Bool
     ) -> String? {
         let envelope = SocketClientCapabilityCommand(command)
-        if peerHasSameUID,
-           let envelope,
-           capabilityAuthority.verifies(envelope.capability) {
-            return envelope.command
+        if let peerProcessID, isDescendant(peerProcessID) {
+            return envelope?.command ?? command
         }
-
-        guard cacheAncestryAuthorization(
-            peerProcessID: peerProcessID,
-            isDescendant: isDescendant
-        ) else { return nil }
-        return envelope?.command ?? command
+        guard peerHasSameUID,
+              let envelope,
+              capabilityAuthority.verifies(envelope.capability) else {
+            return nil
+        }
+        return envelope.command
     }
 }

Packages/macOS/CmuxControlSocket/Sources/CmuxControlSocket/Wire/ControlCommandExecutionPolicy.swift

@@ -97,13 +97,6 @@ public enum ControlCommandExecutionPolicy: Sendable, Equatable {
         "mobile.terminal.set_font",
         "system.top",
         "system.memory",
-        // Owner attribution performs a fresh process + listener capture and
-        // awaits utility tasks. It never touches UI state, so running it on the
-        // main actor would contaminate the latency path it exists to prove.
-        "performance.metrics.exercise_process",
-        // Uses an isolated temporary Git repository and in-memory PR host. Git
-        // scanning stays off-main; only the PR state machine hops to MainActor.
-        "performance.metrics.exercise_git_pr",
         // `surface.read_text` reads a terminal's visible or full-scrollback
         // text and formats it (line tailing, candidate scoring, base64
         // encoding). On the main actor that formatting stalls the run loop

Packages/macOS/CmuxControlSocket/Tests/CmuxControlSocketTests/ControlCommandContextTestStubs+Debug.swift

@@ -11,8 +11,6 @@ import Foundation
 extension ControlDebugContext {
     func controlDebugSessionSnapshotBenchmark(includeScrollback: Bool, persist: Bool) -> JSONValue? { nil }
     func controlDebugSessionSnapshotSeedScrollback(charactersPerTerminal: Int) -> JSONValue? { nil }
-    func controlDebugReadProcessPerformanceMetrics() -> JSONValue? { nil }
-    func controlDebugResetProcessPerformanceMetrics() -> JSONValue? { nil }
     func controlDebugSetShortcut(arguments: String) -> String { "ERROR: not implemented" }
     func controlDebugSimulateShortcut(combo: String) -> String { "ERROR: not implemented" }
     func controlDebugActivateApp() -> String { "ERROR: not implemented" }

Packages/macOS/CmuxControlSocket/Tests/CmuxControlSocketTests/ControlCommandCoordinatorDebugV1Tests.swift

@@ -17,13 +17,6 @@ private final class FakeDebugV1ControlCommandContext: ControlCommandContext {
     var rightSidebarResolution: ControlDebugRightSidebarFocusResolution = .windowNotFound
     var remoteTmuxSizingPayload: JSONValue?
 
-    var processMetrics = JSONValue.object([
-        "process_snapshots": .object(["capture_started": .int(3)])
-    ])
-    var processMetricsReadCount = 0
-    var processMetricsResetCount = 0
-    var typedTexts: [String] = []
-
     func controlDebugSetShortcut(arguments: String) -> String {
         setShortcutArguments = arguments
         return setShortcutResponse
@@ -39,24 +32,6 @@ private final class FakeDebugV1ControlCommandContext: ControlCommandContext {
         return rightSidebarResolution
     }
 
-    func controlDebugReadProcessPerformanceMetrics() -> JSONValue? {
-        processMetricsReadCount += 1
-        return processMetrics
-    }
-
-    func controlDebugResetProcessPerformanceMetrics() -> JSONValue? {
-        processMetricsResetCount += 1
-        processMetrics = .object([
-            "process_snapshots": .object(["capture_started": .int(0)])
-        ])
-        return processMetrics
-    }
-
-    func controlDebugTypeText(_ text: String) -> ControlDebugTypeResolution {
-        typedTexts.append(text)
-        return .inserted
-    }
-
     func controlDebugRemoteTmuxSizingSettled() -> JSONValue? {
         remoteTmuxSizingPayload
     }
@@ -146,42 +121,5 @@ struct ControlCommandCoordinatorDebugV1Tests {
         let reply = coordinator.handleDebugV1(command: "debug_right_sidebar_focus", args: "split")
         #expect(reply == "ERROR: mode=split active= visible=0 context=0 state=0 focus=0")
     }
-
-    @Test func processMetricsReadAndResetUseSharedDebugDomain() {
-        let (coordinator, context) = makeCoordinator()
-        let read = coordinator.handle(ControlRequest(
-            id: .int(1),
-            method: "debug.process_metrics.read",
-            params: [:]
-        ))
-        #expect(read == .ok(.object([
-            "process_snapshots": .object(["capture_started": .int(3)])
-        ])))
-        #expect(context.processMetricsReadCount == 1)
-
-        let reset = coordinator.handle(ControlRequest(
-            id: .int(2),
-            method: "debug.process_metrics.reset",
-            params: [:]
-        ))
-        #expect(reset == .ok(.object([
-            "process_snapshots": .object(["capture_started": .int(0)])
-        ])))
-        #expect(context.processMetricsResetCount == 1)
-    }
-
-    @Test func typingDoesNotReadOrResetProcessMetrics() {
-        let (coordinator, context) = makeCoordinator()
-        let result = coordinator.handle(ControlRequest(
-            id: .int(1),
-            method: "debug.type",
-            params: ["text": .string("typing workload")]
-        ))
-
-        #expect(result == .ok(.object([:])))
-        #expect(context.typedTexts == ["typing workload"])
-        #expect(context.processMetricsReadCount == 0)
-        #expect(context.processMetricsResetCount == 0)
-    }
 }
 #endif

Packages/macOS/CmuxControlSocket/Tests/CmuxControlSocketTests/ControlCommandExecutionPolicyTests.swift

@@ -30,8 +30,6 @@ struct ControlCommandExecutionPolicyTests {
         for method in [
             "system.ping", "system.capabilities", "auth.status", "auth.sign_in_url",
             "feed.push", "browser.download.wait", "system.top", "system.memory",
-            "performance.metrics.exercise_process",
-            "performance.metrics.exercise_git_pr",
             "workspace.remote.pty_bridge", "workspace.env", "sidebar.custom.reload",
             "sidebar.custom.open",
             "debug.sidebar.simulate_drag", "mobile.attach_ticket.create",

Packages/macOS/CmuxControlSocket/Tests/CmuxControlSocketTests/SocketCapabilityRebindTests.swift

@@ -52,20 +52,14 @@ struct SocketCapabilityRebindTests {
         }
 
         let command = "hooks claude prompt-submit"
-        var authorization = SocketClientAuthorization()
-        var ancestryEvaluationCount = 0
-        let authorized = authorization.authorizedCommand(
+        let authorized = SocketClientAuthorization().authorizedCommand(
             envelope.wrap(command),
             peerProcessID: reboundConnection.peerProcessID,
             peerHasSameUID: true,
             capabilityAuthority: authority,
-            isDescendant: { _ in
-                ancestryEvaluationCount += 1
-                return false
-            }
+            isDescendant: { _ in false }
         )
         #expect(authorized == command)
-        #expect(ancestryEvaluationCount == 0)
     }
 
     private func connect(to path: String) -> Int32 {