fix(tests): lsp specs ride the seam scrub; acp e2e mounts the subprocess service

CI now exports DSH_GATE_CONCURRENCY into every job, and the lsp suites
spread the raw parent env into the spawn spec's ordinary channel — which
the seam rightly rejects for DSH_* names. The specs now build their child
env the way production does (scrubbedParentEnv() + explicit extras).
The acp with-key e2e never mounted dsh-subprocess-local, leaving the
provider's inject unsatisfied, so no 'acp' provider ever registered.

packages/lsp/lsp-local/tests/connection.spec.ts

@@ -2,6 +2,7 @@ import { afterEach, describe, expect, it } from 'vitest'
 import { fileURLToPath } from 'node:url'
 import { LspConnection } from '@deepseek-ai/dsh-lsp-local'
 import type { ConnectionWriter } from '@deepseek-ai/dsh-lsp-local/src/connection.ts'
+import { scrubbedParentEnv } from '@deepseek-ai/dsh-subprocess'
 import { spawnSubprocess } from '@deepseek-ai/dsh-subprocess-local/src/spawn.ts'
 
 const fixtureServer = fileURLToPath(new URL('./fixture-server.ts', import.meta.url))
@@ -29,7 +30,7 @@ function connect(
     command: process.execPath,
     args: [fixtureServer],
     cwd: process.cwd(),
-    env: { ...process.env as Record<string, string>, ...env },
+    env: { ...scrubbedParentEnv(), ...env },
     maxMessageBytes: 16_000_000,
     maxStderrBytes: 100_000,
     pipeDrainGraceMs: 3_000,
@@ -139,7 +140,7 @@ function connectScript(script: string, maxStderrBytes = 100_000, writer?: Connec
     command: process.execPath,
     args: ['-e', script],
     cwd: process.cwd(),
-    env: { ...process.env as Record<string, string> },
+    env: scrubbedParentEnv(),
     maxMessageBytes: 16_000_000,
     maxStderrBytes,
     pipeDrainGraceMs: 3_000,

packages/lsp/lsp-local/tests/instance.spec.ts

@@ -9,6 +9,7 @@ import type { ConnectionWriter } from '@deepseek-ai/dsh-lsp-local/src/connection
 import { escalateProcessTree } from '@deepseek-ai/dsh-lsp-local/src/instance.ts'
 import type { InstanceSpec } from '@deepseek-ai/dsh-lsp-local/src/instance.ts'
 import type { LspProviderQuery, LspQueryResult } from '@deepseek-ai/dsh-lsp'
+import { scrubbedParentEnv } from '@deepseek-ai/dsh-subprocess'
 import { spawnSubprocess } from '@deepseek-ai/dsh-subprocess-local/src/spawn.ts'
 
 const fixtureServer = fileURLToPath(new URL('./fixture-server.ts', import.meta.url))
@@ -39,7 +40,7 @@ function makeInstance(
     command: process.execPath,
     args: [fixtureServer],
     cwd: ws,
-    env: { ...process.env as Record<string, string>, ...env },
+    env: { ...scrubbedParentEnv(), ...env },
     configuration: { setting: 42 },
     initializationOptions: { init: true },
     maxMessageBytes: 16_000_000,
@@ -69,7 +70,7 @@ function scriptInstance(script: string, overrides: Partial<InstanceSpec> = {}):
     command: process.execPath,
     args: ['-e', script],
     cwd: ws,
-    env: { ...process.env as Record<string, string> },
+    env: scrubbedParentEnv(),
     configuration: null,
     initializationOptions: null,
     maxMessageBytes: 16_000_000,

packages/subagent/subagent-acp/tests/subagent-acp.e2e.ts

@@ -6,6 +6,7 @@ import { afterEach, describe, expect, it } from 'vitest'
 import { Context } from 'cordis'
 import type { Agent } from '@deepseek-ai/dsh-agent'
 import SubagentService from '@deepseek-ai/dsh-subagent'
+import LocalSubprocessService from '@deepseek-ai/dsh-subprocess-local'
 import { resolveExampleLaunch } from '@deepseek-ai/dsh-loader-smoke'
 import * as acp from '../src/index.ts'
 
@@ -52,6 +53,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('ACP backend with-key e2e (drive
     workdir = await mkdtemp(join(tmpdir(), 'dsh-subagent-acp-e2e-'))
     ctx = new Context()
     await ctx.plugin(SubagentService)
+    await ctx.plugin(LocalSubprocessService)
     await ctx.plugin(acp, {
       providerName: 'acp',
       command: childLaunch.command,
@@ -81,6 +83,7 @@ describe.skipIf(!process.env.DEEPSEEK_API_KEY)('ACP backend with-key e2e (drive
     workdir = await mkdtemp(join(tmpdir(), 'dsh-subagent-acp-e2e-'))
     ctx = new Context()
     await ctx.plugin(SubagentService)
+    await ctx.plugin(LocalSubprocessService)
     await ctx.plugin(acp, {
       providerName: 'acp',
       command: childLaunch.command,