Phase 003: remove the coding-agent and ekko-agent runtimes

Every chat session now runs through the Hermes bridge, so the three chat
chains become feature-equivalent instead of three partially-maintained
dispatch paths. Keeping the coding-agent and in-house agent runtimes alive
meant every bridge change had to be mirrored into two more runtimes that
had already drifted.

Historical rows are read, not migrated: sessions stored with the retired
source normalize to cli on load, workflow graphs naming the retired agents
keep loading and run on the bridge, and the visible-source check plus
SOURCE_LABELS still recognize the old value so those sessions stay listed.

The public surface follows the code: the OpenAPI generator and the MCP
chat-run tool schema drop the six retired entry fields so external callers
are not told about runtimes that no longer exist.

harness-check gains a RETIRED_RUNTIME scan so the residual check is a
mechanical gate instead of a manual grep, with the two surviving read-side
compat sites recorded with reasons.

Refs: docs/phases/phase_003.md

packages/client/src/components/hermes/chat/ChatPanel.vue

@@ -1,7 +1,5 @@
 <script setup lang="ts">
 import { renameSession, setSessionWorkspace, batchDeleteSessions, exportSession } from "@/api/hermes/sessions";
-import type { AvailableModelGroup } from "@/api/hermes/system";
-import { fetchCodingAgentsStatus, inferCodingAgentApiMode, normalizeCodingAgentApiMode, type ChatCodingAgentId, type CodingAgentApiMode, type CodingAgentId } from "@/api/coding-agents";
 import { useChatStore, type Session } from "@/stores/hermes/chat";
 import { useAppStore } from "@/stores/hermes/app";
 import { useProfilesStore } from "@/stores/hermes/profiles";
@@ -16,8 +14,6 @@ import {
   NSelect,
   NTooltip,
   NPopconfirm,
-  NRadioButton,
-  NRadioGroup,
   useMessage,
   type DropdownOption,
 } from "naive-ui";
@@ -321,14 +317,9 @@ const headerTitle = computed(() =>
 );
 
 const showNewChatModal = ref(false);
-const newChatAgent = ref<"hermes" | ChatCodingAgentId>("hermes");
-const newChatAgentMode = ref<"global" | "scoped">("scoped");
 const newChatProfile = ref<string>("default");
 const newChatProvider = ref<string>("");
 const newChatModel = ref<string>("");
-const newChatBaseUrl = ref<string>("");
-const newChatApiKey = ref<string>("");
-const newChatApiMode = ref<CodingAgentApiMode>("codex_responses");
 const newChatWorkspace = ref("");
 const newChatLoading = ref(false);
 
@@ -425,30 +416,6 @@ const hiddenDefaultWorkspaces = computed(() => {
   return defaultWorkspaces.value.filter(ws => !visible.has(ws));
 });
 
-const CODING_AGENT_AUTH_PROVIDER_KEYS = new Set(["openai-codex", "copilot", "xai-oauth", "nous", "google-gemini-cli", "claude-oauth"]);
-
-const showEkkoAgentEntry = import.meta.env.DEV;
-const newChatAgentOptions = computed(() => {
-  const options = [
-    { label: "Hermes", value: "hermes" },
-    { label: "Claude Code", value: "claude-code" },
-    { label: "Codex", value: "codex" },
-  ];
-  if (showEkkoAgentEntry) options.push({ label: "Ekko Agent", value: "ekko-agent" });
-  return options;
-});
-
-const newChatApiModeOptions = computed(() => [
-  { label: t("codingAgents.protocolOpenAiChat"), value: "chat_completions" },
-  { label: t("codingAgents.protocolOpenAiResponses"), value: "codex_responses" },
-  { label: t("codingAgents.protocolAnthropicMessages"), value: "anthropic_messages" },
-]);
-
-const newChatAgentModeOptions = computed(() => [
-  { label: t("codingAgents.launchModeGlobal"), value: "global" },
-  { label: t("codingAgents.launchModeScoped"), value: "scoped" },
-]);
-
 function getModelGroupsForProfile(profile: string) {
   const profileModels = appStore.profileModelGroups.find(
     (entry) => entry.profile === profile,
@@ -456,18 +423,8 @@ function getModelGroupsForProfile(profile: string) {
   return profileModels?.groups || [];
 }
 
-function isCodingAgentAuthProvider(provider?: string) {
-  return CODING_AGENT_AUTH_PROVIDER_KEYS.has(String(provider || "").toLowerCase());
-}
-
-function isNewChatProviderAllowed(group: AvailableModelGroup) {
-  const mode = newChatAgent.value === "ekko-agent" ? "scoped" : newChatAgentMode.value;
-  if (!(newChatAgent.value !== "hermes" && mode === "scoped")) return true;
-  return !isCodingAgentAuthProvider(group.provider);
-}
-
 function getSelectableModelGroupsForProfile(profile: string) {
-  return getModelGroupsForProfile(profile).filter(isNewChatProviderAllowed);
+  return getModelGroupsForProfile(profile);
 }
 
 function getDefaultModelForProfile(profile: string) {
@@ -536,66 +493,28 @@ const selectedNewChatProviderGroup = computed(() =>
   newChatModelGroups.value.find((item) => item.provider === newChatProvider.value),
 );
 
-const isNewChatCodingAgent = computed(() => newChatAgent.value !== "hermes");
-const isNewChatExternalCodingAgent = computed(() => newChatAgent.value === "claude-code" || newChatAgent.value === "codex");
-const effectiveNewChatAgentMode = computed(() =>
-  newChatAgent.value === "ekko-agent" ? "scoped" : newChatAgentMode.value,
-);
-const isNewChatGlobalCodingAgent = computed(() =>
-  isNewChatCodingAgent.value && effectiveNewChatAgentMode.value === "global",
-);
-const newChatUsesProviderModel = computed(() => !isNewChatGlobalCodingAgent.value);
-const newChatNeedsBaseUrl = computed(() =>
-  isNewChatCodingAgent.value && effectiveNewChatAgentMode.value === "scoped" && !selectedNewChatProviderGroup.value?.base_url,
-);
-const newChatNeedsApiKey = computed(() =>
-  isNewChatCodingAgent.value && effectiveNewChatAgentMode.value === "scoped" && !selectedNewChatProviderGroup.value?.api_key,
-);
 const canConfirmNewChat = computed(() => {
   if (!newChatProfile.value) return false;
-  if (!newChatUsesProviderModel.value) return true;
   if (!newChatProvider.value || !newChatModel.value) return false;
-  if (!isNewChatCodingAgent.value) return true;
-  if (isNewChatExternalCodingAgent.value && !newChatApiMode.value) return false;
-  if (newChatNeedsBaseUrl.value && !newChatBaseUrl.value.trim()) return false;
-  if (newChatNeedsApiKey.value && !newChatApiKey.value.trim()) return false;
   return true;
 });
 
-function defaultNewChatApiMode(group?: AvailableModelGroup): CodingAgentApiMode {
-  const providerKey = String(group?.provider || newChatProvider.value || "").toLowerCase();
-  const baseUrl = String(group?.base_url || newChatBaseUrl.value || "").toLowerCase();
-  return normalizeCodingAgentApiMode(
-    group?.api_mode,
-    inferCodingAgentApiMode(providerKey, baseUrl),
-  );
-}
-
-function syncNewChatApiMode() {
-  newChatApiMode.value = defaultNewChatApiMode(selectedNewChatProviderGroup.value);
-}
-
 function syncNewChatModelSelection() {
   const defaults = getDefaultModelForProfile(newChatProfile.value);
   newChatProvider.value = defaults.provider;
   newChatModel.value = defaults.model;
-  newChatBaseUrl.value = "";
-  newChatApiKey.value = "";
-  syncNewChatApiMode();
 }
 
 function ensureNewChatProviderSelection() {
-  if (!newChatUsesProviderModel.value) return;
   const currentGroup = selectedNewChatProviderGroup.value;
   if (currentGroup && currentGroup.models.includes(newChatModel.value)) {
-    syncNewChatApiMode();
     return;
   }
   syncNewChatModelSelection();
 }
 
 watch(
-  () => [newChatAgent.value, newChatAgentMode.value, newChatProfile.value],
+  () => [newChatProfile.value],
   () => {
     ensureNewChatProviderSelection();
     // Reload workspace data when profile changes
@@ -646,56 +565,16 @@ function handleNewChatProfileChange(value: string) {
 function handleNewChatProviderChange(value: string) {
   newChatProvider.value = value;
   newChatModel.value = newChatModelOptions.value[0]?.value || "";
-  newChatBaseUrl.value = "";
-  newChatApiKey.value = "";
-  syncNewChatApiMode();
 }
 
 async function confirmNewChat() {
-  if (isNewChatExternalCodingAgent.value) {
-    newChatLoading.value = true;
-    try {
-      const agentId = newChatAgent.value as CodingAgentId;
-      const status = await fetchCodingAgentsStatus();
-      const tool = status.tools.find((item) => item.id === agentId);
-      if (!tool?.installed) {
-        const fallbackName = agentId === "codex" ? "Codex" : "Claude Code";
-        message.warning(t("codingAgents.installRequired", { agent: tool?.name || fallbackName }));
-        showNewChatModal.value = false;
-        await router.push({ name: "hermes.codingAgents" });
-        return;
-      }
-    } catch {
-      message.error(t("codingAgents.loadFailed"));
-      return;
-    } finally {
-      newChatLoading.value = false;
-    }
-  }
-
-  const group = selectedNewChatProviderGroup.value;
-  const source = newChatAgent.value === "hermes" ? "cli" : "coding_agent";
-  const codingAgentMode = effectiveNewChatAgentMode.value;
-  const isGlobalCodingAgent = source === "coding_agent" && codingAgentMode === "global";
-  const agent = newChatAgent.value === "codex"
-    ? "codex"
-    : newChatAgent.value === "claude-code"
-      ? "claude"
-      : newChatAgent.value === "ekko-agent"
-        ? "ekko-agent"
-      : "hermes";
   const session = chatStore.newChat({
     profile: newChatProfile.value,
-    provider: isGlobalCodingAgent ? undefined : newChatProvider.value,
-    model: isGlobalCodingAgent ? undefined : newChatModel.value,
-    source,
-    agent,
-    codingAgentId: newChatAgent.value === "hermes" ? undefined : newChatAgent.value,
-    codingAgentMode: source === "coding_agent" ? codingAgentMode : undefined,
+    provider: newChatProvider.value,
+    model: newChatModel.value,
+    source: "cli",
+    agent: "hermes",
     workspace: newChatWorkspace.value || null,
-    baseUrl: source === "coding_agent" && !isGlobalCodingAgent ? group?.base_url || newChatBaseUrl.value.trim() || undefined : undefined,
-    apiKey: source === "coding_agent" && !isGlobalCodingAgent ? group?.api_key || newChatApiKey.value.trim() || undefined : undefined,
-    apiMode: isNewChatExternalCodingAgent.value && !isGlobalCodingAgent ? newChatApiMode.value : undefined,
   });
   // Record workspace to recent list
   if (newChatWorkspace.value && workspaceComposable) {
@@ -867,7 +746,7 @@ const contextMenuOptions = computed(() => {
 
   options.push({ label: t("chat.setWorkspace"), key: "workspace" })
 
-  if (contextSession.value?.source === "cli" || contextSession.value?.source === "coding_agent") {
+  if (contextSession.value?.source === "cli") {
     options.push({ label: t("chat.setModel"), key: "model" })
   }
 
@@ -1041,7 +920,6 @@ async function handleWorkspaceConfirm() {
 }
 
 const showSessionModelModal = ref(false);
-const showSessionModelModeModal = ref(false);
 const sessionModelSessionId = ref<string | null>(null);
 const sessionModelSearch = ref("");
 const sessionModelCollapsedGroups = ref<Record<string, boolean>>({});
@@ -1049,44 +927,14 @@ const sessionModelValue = ref("");
 const sessionModelProvider = ref("");
 const sessionModelCustomInput = ref("");
 const sessionModelCustomProvider = ref("");
-const sessionModelApiMode = ref<CodingAgentApiMode>("codex_responses");
-const pendingSessionModelSwitch = ref<{ model: string; provider: string } | null>(null);
 
 const sessionModelProfile = computed<string | null>(() => {
   const session = chatStore.sessions.find((s) => s.id === sessionModelSessionId.value);
   return session?.profile || null;
 });
 
-const sessionModelSession = computed(() =>
-  chatStore.sessions.find((s) => s.id === sessionModelSessionId.value) ||
-  (chatStore.activeSession?.id === sessionModelSessionId.value ? chatStore.activeSession : undefined),
-);
-
-const isSessionModelScopedCodingAgent = computed(() =>
-  sessionModelSession.value?.source === "coding_agent" &&
-  sessionModelSession.value?.codingAgentMode !== "global",
-);
-const sessionModelCodingAgentId = computed<ChatCodingAgentId | undefined>(() =>
-  sessionModelSession.value?.codingAgentId ||
-  (sessionModelSession.value?.agent === "claude"
-    ? "claude-code"
-    : sessionModelSession.value?.agent === "codex"
-      ? "codex"
-      : sessionModelSession.value?.agent === "ekko-agent"
-        ? "ekko-agent"
-        : undefined),
-);
-const isSessionModelExternalCodingAgent = computed(() =>
-  isSessionModelScopedCodingAgent.value &&
-  (sessionModelCodingAgentId.value === "claude-code" || sessionModelCodingAgentId.value === "codex"),
-);
-
 const sessionModelBaseGroups = computed(() =>
-  sessionModelProfile.value
-    ? getModelGroupsForProfile(sessionModelProfile.value).filter((group) => (
-        !isSessionModelScopedCodingAgent.value || !isCodingAgentAuthProvider(group.provider)
-      ))
-    : [],
+  sessionModelProfile.value ? getModelGroupsForProfile(sessionModelProfile.value) : [],
 );
 
 const sessionModelProviderOptions = computed(() =>
@@ -1176,25 +1024,12 @@ function sessionModelAlias(model: string, provider: string) {
   return appStore.getModelAlias(model, provider);
 }
 
-function defaultSessionModelApiMode(provider: string): CodingAgentApiMode {
-  const group = sessionModelBaseGroups.value.find((item) => item.provider === provider);
-  const providerKey = String(group?.provider || provider || "").toLowerCase();
-  const baseUrl = String(group?.base_url || "").toLowerCase();
-  return normalizeCodingAgentApiMode(
-    group?.api_mode,
-    inferCodingAgentApiMode(providerKey, baseUrl),
-  );
-}
-
-async function applySessionModelSwitch(model: string, provider: string, apiMode?: CodingAgentApiMode) {
+async function applySessionModelSwitch(model: string, provider: string) {
   if (!sessionModelSessionId.value) return;
-  const ok = await chatStore.switchSessionModel(model, provider, sessionModelSessionId.value, apiMode);
+  const ok = await chatStore.switchSessionModel(model, provider, sessionModelSessionId.value);
   if (ok) {
     sessionModelValue.value = model;
     sessionModelProvider.value = provider;
-    if (apiMode) sessionModelApiMode.value = apiMode;
-    pendingSessionModelSwitch.value = null;
-    showSessionModelModeModal.value = false;
     showSessionModelModal.value = false;
     message.success(t("chat.modelSet"));
   } else {
@@ -1205,28 +1040,9 @@ async function applySessionModelSwitch(model: string, provider: string, apiMode?
 async function selectSessionModel(model: string, provider: string) {
   const meta = sessionModelBaseGroups.value.find((group) => group.provider === provider)?.model_meta?.[model];
   if (meta?.disabled || !sessionModelSessionId.value) return;
-  if (isSessionModelExternalCodingAgent.value) {
-    pendingSessionModelSwitch.value = { model, provider };
-    sessionModelApiMode.value = sessionModelSession.value?.provider === provider && sessionModelSession.value.apiMode
-      ? normalizeCodingAgentApiMode(sessionModelSession.value.apiMode, defaultSessionModelApiMode(provider))
-      : defaultSessionModelApiMode(provider);
-    showSessionModelModeModal.value = true;
-    return;
-  }
   await applySessionModelSwitch(model, provider);
 }
 
-async function confirmSessionModelMode() {
-  const pending = pendingSessionModelSwitch.value;
-  if (!pending) return;
-  await applySessionModelSwitch(pending.model, pending.provider, sessionModelApiMode.value);
-}
-
-function cancelSessionModelMode() {
-  pendingSessionModelSwitch.value = null;
-  showSessionModelModeModal.value = false;
-}
-
 async function handleSessionModelCustomSubmit() {
   const model = sessionModelCustomInput.value.trim();
   const provider = sessionModelCustomProvider.value;
@@ -1589,27 +1405,6 @@ async function handleSessionModelCustomSubmit() {
       </div>
     </NModal>
 
-    <NModal
-      v-model:show="showSessionModelModeModal"
-      preset="dialog"
-      :title="t('codingAgents.protocolScope')"
-      :mask-closable="true"
-      style="width: min(420px, calc(100vw - 32px))"
-    >
-      <NSelect
-        v-model:value="sessionModelApiMode"
-        :options="newChatApiModeOptions"
-      />
-      <template #action>
-        <NButton size="small" @click="cancelSessionModelMode">
-          {{ t('common.cancel') }}
-        </NButton>
-        <NButton size="small" type="primary" @click="confirmSessionModelMode">
-          {{ t('common.confirm') }}
-        </NButton>
-      </template>
-    </NModal>
-
     <NDrawer
       v-model:show="showNewChatModal"
       class="new-chat-drawer"
@@ -1619,26 +1414,6 @@ async function handleSessionModelCustomSubmit() {
     >
       <NDrawerContent :title="t('chat.newChat')" closable>
         <div class="new-chat-form">
-          <label class="new-chat-field">
-            <span class="new-chat-label">{{ t("chat.agent") }}</span>
-            <NSelect
-              v-model:value="newChatAgent"
-              :options="newChatAgentOptions"
-              :disabled="newChatLoading"
-            />
-          </label>
-          <label v-if="isNewChatExternalCodingAgent" class="new-chat-field">
-            <span class="new-chat-label">{{ t("codingAgents.launchModeScope") }}</span>
-            <NRadioGroup v-model:value="newChatAgentMode" name="new-chat-coding-agent-mode">
-              <NRadioButton
-                v-for="option in newChatAgentModeOptions"
-                :key="option.value"
-                :value="option.value"
-              >
-                {{ option.label }}
-              </NRadioButton>
-            </NRadioGroup>
-          </label>
           <label class="new-chat-field">
             <span class="new-chat-label">{{ t("sidebar.profiles") }}</span>
             <NSelect
@@ -1648,7 +1423,7 @@ async function handleSessionModelCustomSubmit() {
               @update:value="handleNewChatProfileChange"
             />
           </label>
-          <label v-if="newChatUsesProviderModel" class="new-chat-field">
+          <label class="new-chat-field">
             <span class="new-chat-label">{{ t("models.provider") }}</span>
             <NSelect
               :value="newChatProvider"
@@ -1657,7 +1432,7 @@ async function handleSessionModelCustomSubmit() {
               @update:value="handleNewChatProviderChange"
             />
           </label>
-          <label v-if="newChatUsesProviderModel" class="new-chat-field">
+          <label class="new-chat-field">
             <span class="new-chat-label">{{ t("models.models") }}</span>
             <NSelect
               v-model:value="newChatModel"
@@ -1666,30 +1441,6 @@ async function handleSessionModelCustomSubmit() {
               filterable
             />
           </label>
-          <label v-if="isNewChatExternalCodingAgent && effectiveNewChatAgentMode === 'scoped'" class="new-chat-field">
-            <span class="new-chat-label">{{ t("codingAgents.protocolScope") }}</span>
-            <NSelect
-              v-model:value="newChatApiMode"
-              :options="newChatApiModeOptions"
-              :disabled="newChatLoading"
-            />
-          </label>
-          <label v-if="newChatNeedsBaseUrl" class="new-chat-field">
-            <span class="new-chat-label">{{ t("models.baseUrl") }}</span>
-            <NInput
-              v-model:value="newChatBaseUrl"
-              :placeholder="t('models.baseUrlPlaceholder')"
-            />
-          </label>
-          <label v-if="newChatNeedsApiKey" class="new-chat-field">
-            <span class="new-chat-label">{{ t("models.apiKey") }}</span>
-            <NInput
-              v-model:value="newChatApiKey"
-              type="password"
-              show-password-on="click"
-              :placeholder="t('models.apiKeyPlaceholder')"
-            />
-          </label>
           <div class="new-chat-field">
             <span class="new-chat-label">
               {{ t("chat.workspace") }}