fix(memory): bound native chat enrichment cache

src/renderer/src/components/native-chat/native-chat-session-option-enrichment.test.ts

@@ -7,6 +7,8 @@ import {
 import {
   clearNativeChatModelEnrichmentForTests,
   ensureNativeChatModelEnrichment,
+  getNativeChatModelEnrichmentEntryCountForTests,
+  NATIVE_CHAT_MODEL_ENRICHMENT_MAX_ENTRIES,
   readNativeChatEnrichedModels,
   resolveNativeChatLaunchSessionOptions,
   subscribeNativeChatEnrichedModels
@@ -27,6 +29,22 @@ describe('native chat session option enrichment', () => {
     mocks.discoverRuntimeCommitMessageModels.mockReset()
   })
 
+  it('bounds settled host enrichment entries', async () => {
+    for (let index = 0; index < NATIVE_CHAT_MODEL_ENRICHMENT_MAX_ENTRIES + 4; index += 1) {
+      ensureNativeChatModelEnrichment({
+        agent: 'cursor',
+        hostKey: `ssh:${index}`,
+        discover: async () => []
+      })
+    }
+    await Promise.resolve()
+    await Promise.resolve()
+
+    expect(getNativeChatModelEnrichmentEntryCountForTests()).toBe(
+      NATIVE_CHAT_MODEL_ENRICHMENT_MAX_ENTRIES
+    )
+  })
+
   it('keeps reads synchronous while one host-scoped probe is in flight', async () => {
     let resolveDiscovery: ((models: CatalogModel[]) => void) | undefined
     const discover = vi.fn(

src/renderer/src/components/native-chat/native-chat-session-option-enrichment.ts

@@ -19,6 +19,21 @@ type CatalogEnrichmentEntry = {
 }
 
 const enrichmentByAgentHost = new Map<string, CatalogEnrichmentEntry>()
+export const NATIVE_CHAT_MODEL_ENRICHMENT_MAX_ENTRIES = 256
+
+function retainEnrichmentEntry(key: string, entry: CatalogEnrichmentEntry): void {
+  enrichmentByAgentHost.delete(key)
+  enrichmentByAgentHost.set(key, entry)
+  while (enrichmentByAgentHost.size > NATIVE_CHAT_MODEL_ENRICHMENT_MAX_ENTRIES) {
+    const evictable = [...enrichmentByAgentHost].find(
+      ([, candidate]) => candidate.listeners.size === 0 && candidate.state !== 'pending'
+    )
+    if (!evictable) {
+      return
+    }
+    enrichmentByAgentHost.delete(evictable[0])
+  }
+}
 
 function enrichmentKey(agent: AgentType, hostKey: string): string {
   return JSON.stringify([agent, hostKey])
@@ -45,7 +60,7 @@ export function subscribeNativeChatEnrichedModels(
     listeners: new Set<(models: CatalogModel[]) => void>()
   }
   entry.listeners.add(listener)
-  enrichmentByAgentHost.set(key, entry)
+  retainEnrichmentEntry(key, entry)
   return () => entry.listeners.delete(listener)
 }
 
@@ -90,7 +105,7 @@ export function ensureNativeChatModelEnrichment(args: {
     listeners: new Set()
   }
   entry.state = 'pending'
-  enrichmentByAgentHost.set(key, entry)
+  retainEnrichmentEntry(key, entry)
 
   // Why: model discovery must never delay rendering or launching; the seed is
   // immediately usable while this once-per-host probe runs in the background.
@@ -98,6 +113,7 @@ export function ensureNativeChatModelEnrichment(args: {
     .discover()
     .then((discovered) => {
       entry.state = 'settled'
+      retainEnrichmentEntry(key, entry)
       if (!discovered || discovered.length === 0) {
         return
       }
@@ -113,9 +129,15 @@ export function ensureNativeChatModelEnrichment(args: {
     })
     .catch(() => {
       entry.state = 'settled'
+      retainEnrichmentEntry(key, entry)
     })
 }
 
 export function clearNativeChatModelEnrichmentForTests(): void {
   enrichmentByAgentHost.clear()
 }
+
+/** @internal - exposed for leak-regression tests only. */
+export function getNativeChatModelEnrichmentEntryCountForTests(): number {
+  return enrichmentByAgentHost.size
+}