fix: remove avoidable model runtime limits

Preserve long histories and parsed attachments, expose paged process and Subagent output, isolate MCP discovery failures, and expand browser snapshots and knowledge result selection. Remove fixed Harness output and updated remote Runtime duration limits.

Keep released Agent profile and v1 bridge compatibility while enabling larger framed exchanges and optional limits for updated peers. Document remote coverage requirements and real-model boundary validation.

Release note: Long model tasks can retain more context and continue reading complete tool output; remote execution preserves compatibility with released Agents. Updated remote limits require an updated Agent and Runtime bundle.

src/main/agent/continue-runtime.test.ts

@@ -523,7 +523,7 @@ describe('ContinueAgentRuntime', () => {
     expect(prompt.length).toBeGreaterThan(24_000)
   })
 
-  it('reports oversized Skill payloads instead of dropping them silently', async () => {
+  it('passes large Skill payloads to Continue without a product character cap', async () => {
     const runtime = new ContinueAgentRuntime({
       binaryPath: '',
       configPath: 'C:\\safe config\\continue.yaml',
@@ -537,8 +537,8 @@ describe('ContinueAgentRuntime', () => {
       })
     })
 
-    await expect(collectEvents(runtime)).rejects.toThrow('超过 Continue')
-    expect(mocks.runHost).not.toHaveBeenCalled()
+    await collectEvents(runtime)
+    expect(String(mocks.runHost.mock.calls[0]?.[0])).toContain('巨'.repeat(130_000))
   })
 
   it('blocks anonymous platform fallback without an explicit model configuration', async () => {
@@ -598,6 +598,26 @@ describe('ContinueAgentRuntime', () => {
     expect(prompt).not.toContain('\n')
   })
 
+  it('passes every history message and its complete text to the native host', async () => {
+    const history = Array.from({ length: 502 }, (_, index) => ({
+      role: index % 2 ? 'assistant' as const : 'user' as const,
+      content: `history-${index} ${index === 0 ? 'x'.repeat(130_000) : 'text'}`
+    }))
+    const runtime = createRuntime()
+    for await (const event of runtime.run({
+      requestId: crypto.randomUUID(),
+      conversationId: 'full-history',
+      prompt: 'current request',
+      history
+    }, new AbortController().signal)) {
+      expect(event).toBeDefined()
+    }
+    const prompt = String(mocks.runHost.mock.calls[0]?.[0])
+    for (const message of history) {
+      expect(prompt).toContain(message.content)
+    }
+  })
+
   it('ignores the synthetic greeting when there is no prior user turn', async () => {
     const runtime = createRuntime()
     for await (const event of runtime.run(