fix: skip repeated OpenCode binary validation

OpenCode startup on Linux ARM could run a --version probe before launching the configured Runtime and recheck registered remote binary metadata. Execution now trusts the selected path and registered manifest identity after setup-time verification, so switching and cold launch avoid duplicate binary work.

Release note: 优化 Linux ARM 上切换 OpenCode 的启动速度；已安装或已登记的 Runtime 在执行时不再重复启动或检查二进制。

docs/features/remote-host/technical-design.md

@@ -81,7 +81,9 @@ Detached GoodBuddy Agent
 - Host 管理独占 Agent/Runtime 的包准备、更新和完整 payload 验证。已有项目的打开和切换
   只更新本地项目选择。Workspace 和执行路径按需读取 Host current registry，
   执行固定 `attach-or-bootstrap` 并复用当前 Agent 连接；同一进程内复用已确认 identity。
-  它们不取得安装包、不发布组件，也不通过 SFTP 重读或哈希 payload。
+  它们不取得安装包、不发布组件，也不通过 SFTP 重读或哈希 payload；已登记 Runtime
+  的能力读取和 Prompt 启动只核对 registry 与 manifest 元数据，不再次执行、读取或检查
+  OpenCode 二进制。
 - Agent 的固定 attach/按需启动命令只读取 Host 管理已提交的 installation registry 和
   与其 digest 匹配的有界 manifest 元数据，不在每次项目切换时重新验签或哈希完整 payload。
   完整验签、payload 扫描和 registry 写入仍只发生在显式 Host 准备/更新流程。

src/agent-daemon/runtime-bundle-verifier.test.ts

@@ -213,11 +213,8 @@ describe('Remote Runtime bundle verifier', () => {
         Buffer.from('changed')
       ])
     )
-    await expect(capabilities()).resolves.toEqual([])
+    await expect(capabilities()).resolves.toHaveLength(1)
-    expect(reportError).toHaveBeenCalledWith(
+    expect(reportError).not.toHaveBeenCalled()
-      'Verified Runtime unavailable: opencode',
-      expect.any(Error)
-    )
   })
 
   it('adopts signed published metadata without rehashing unrelated payload', async () => {

src/main/agent/opencode-runtime.ts

@@ -678,6 +678,7 @@ async function defaultDetectBinary(
   return detectRuntimeBinary({
     binaryPath: configuredPath,
     bundledPath,
+    validation: 'path-only',
     binaryNames: [runtime],
     label: 'OpenCode CLI'
   })

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

@@ -1,6 +1,6 @@
 import { EventEmitter } from 'node:events'
 import { realpath } from 'node:fs/promises'
-import { basename, dirname } from 'node:path'
+import { basename, dirname, resolve } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import {
@@ -93,6 +93,29 @@ describe('runtime discovery', () => {
     expect(detection.version).toMatch(/^\d+\.\d+\.\d+/u)
   })
 
+  it('trusts a configured execution path without reading or launching it', async () => {
+    process.env.PATH = ''
+    process.env.Path = ''
+    const candidate = resolve(
+      dirname(fileURLToPath(import.meta.url)),
+      'runtime-that-does-not-exist'
+    )
+
+    const detection = await detectRuntimeBinary({
+      binaryPath: candidate,
+      validation: 'path-only',
+      binaryNames: ['binary-that-does-not-exist'],
+      label: 'Managed Runtime'
+    })
+
+    expect(detection).toEqual({
+      available: true,
+      path: candidate,
+      source: 'configured',
+      detail: 'Managed Runtime 已就绪'
+    })
+  })
+
   it('rejects relative configured paths without resolving them from cwd', async () => {
     process.env.PATH = ''
     process.env.Path = ''

src/main/agent/runtime-discovery.ts

@@ -25,6 +25,7 @@ const VERSION_TERMINATION_WAIT_MS = 500
 export type RuntimeBinaryDiscoveryInput = {
   binaryPath: string
   bundledPath?: string
+  validation?: 'execute' | 'canonical-file' | 'path-only'
   bundledValidation?: 'execute' | 'canonical-file'
   bundledVersion?: string
   allowAutomaticDiscovery?: boolean
@@ -333,11 +334,24 @@ export async function detectRuntimeBinary(
     if (!bundledPath) {
       return undefined
     }
+    if (input.validation === 'path-only') {
+      return isAbsolute(bundledPath)
+        ? availableDetection(
+            input.label,
+            normalize(bundledPath),
+            input.bundledVersion,
+            'bundled'
+          )
+        : undefined
+    }
     const canonicalPath = await canonicalFile(bundledPath)
     if (!canonicalPath) {
       return undefined
     }
-    if (input.bundledValidation === 'canonical-file') {
+    if (
+      (input.bundledValidation ?? input.validation) ===
+      'canonical-file'
+    ) {
       return availableDetection(
         input.label,
         canonicalPath,
@@ -359,10 +373,24 @@ export async function detectRuntimeBinary(
   if (configuredPath) {
     if (!isAbsolute(configuredPath)) {
       configuredPathProblem = 'relative'
+    } else if (input.validation === 'path-only') {
+      return availableDetection(
+        input.label,
+        normalize(configuredPath),
+        undefined,
+        'configured'
+      )
     } else {
       const canonicalPath = await canonicalFile(configuredPath)
       if (!canonicalPath) {
         configuredPathProblem = 'invalid'
+      } else if (input.validation === 'canonical-file') {
+        return availableDetection(
+          input.label,
+          canonicalPath,
+          undefined,
+          'configured'
+        )
       } else {
         const validation = await validateRuntimeVersion(canonicalPath)
         if (validation.valid) {
@@ -391,6 +419,15 @@ export async function detectRuntimeBinary(
         continue
       }
       foundAutomaticCandidate = true
+      if (
+        input.validation === 'canonical-file' ||
+        input.validation === 'path-only'
+      ) {
+        return availableDetection(
+          input.label,
+          canonicalPath
+        )
+      }
       const validation = await validateRuntimeVersion(canonicalPath)
       if (validation.valid) {
         return availableDetection(

src/shared/node/runtime-bundle-verifier.ts

@@ -233,7 +233,7 @@ export async function verifyPublishedRuntimeBundle(
 /**
  * Reconstructs a Runtime identity that was fully verified when it was
  * registered. Normal capabilities and prompt launches use this bounded
- * metadata path instead of hashing the complete Runtime payload again.
+ * metadata path instead of re-verifying or executing the Runtime binary.
  */
 export async function loadRegisteredRuntimeBundle(
   bundleDirectoryInput: string,
@@ -242,12 +242,50 @@ export async function loadRegisteredRuntimeBundle(
   const registered = runtimeRegistryEntrySchema.parse(
     options.registered
   )
-  const verified = await verifyPublishedRuntimeBundle(
+  const bundleDirectory = assertAbsoluteManagedPath(
-    bundleDirectoryInput,
+    resolve(bundleDirectoryInput)
+  )
+  const rootStat = await lstat(bundleDirectory)
+  assertOwnedDirectory(
+    rootStat,
+    'Runtime bundle directory',
+    options.uid
+  )
+  if (
+    shouldEnforceMode(options) &&
+    modeString(rootStat.mode) !== '0700'
+  ) {
+    throw new Error('Runtime bundle directory permissions must be 0700')
+  }
+  const manifestBytes = await readMetadataFile(
+    join(bundleDirectory, MANIFEST_FILE_NAME),
+    'Runtime manifest',
     options
   )
-  const { manifest, manifestDigest } = verified
+  let value: unknown
+  try {
+    value = JSON.parse(manifestBytes.toString('utf8'))
+  } catch (error) {
+    throw new Error('Runtime manifest is invalid JSON', {
+      cause: error
+    })
+  }
+  const manifest = remoteRuntimeBundleManifestSchema.parse(value)
+  if (!canonicalRuntimeManifestBytes(manifest).equals(manifestBytes)) {
+    throw new Error(
+      'Runtime manifest is not in canonical deterministic form'
+    )
+  }
+  assertRuntimeManifestMatchesLock(
+    manifest,
+    remoteRuntimeLockSchema.parse(options.runtimeLock),
+    options.architecture
+  )
+  const manifestDigest =
+    await digestRemoteRuntimeBundleManifest(manifest)
   if (
+    basename(bundleDirectory) !==
+      registered.bundleDigest.slice('sha256:'.length) ||
     manifest.runtimeId !== registered.runtimeId ||
     manifest.runtimeVersion !== registered.runtimeVersion ||
     manifest.architecture !== registered.architecture ||
@@ -265,7 +303,15 @@ export async function loadRegisteredRuntimeBundle(
     )
   }
 
-  return verified
+  return {
+    bundleDirectory,
+    executablePath: join(
+      bundleDirectory,
+      ...manifest.entrypoint.path.split('/')
+    ),
+    manifest,
+    manifestDigest
+  }
 }
 
 export function canonicalRuntimeManifestBytes(