Suppress Node.js ExperimentalWarning in Copilot SDK subprocess to fix Node 24 stage failures

[Copilot]

Node.js v24+ emits ExperimentalWarning: SQLite is an experimental feature to stderr when the SQLite module is loaded. The @github/copilot-sdk treats any stderr output as fatal when its CLI subprocess exits, causing every agent-based pipeline stage to fail with CLI server exited with code 0 despite the process succeeding.

Changes

• CopilotProvider.ts — buildChildEnv() injects --disable-warning=ExperimentalWarning into NODE_OPTIONS for the SDK child process, suppressing the warning at the Node.js runtime level without affecting the parent process's process.env
• BaseAgent.ts — adds 'cli server exited' to the retryable error patterns so transient subprocess failures are retried up to 3× with exponential backoff

function buildChildEnv(): Record<string, string | undefined> {
  const env = { ...process.env }
  const flag = '--disable-warning=ExperimentalWarning'
  const current = env.NODE_OPTIONS ?? ''
  if (!current.includes(flag)) {
    env.NODE_OPTIONS = current ? `${current} ${flag}` : flag
  }
  return env  // passed to CopilotClient({ env }) — parent process.env is unchanged
}

Tests

• Unit: verifies NODE_OPTIONS flag is passed to CopilotClient and existing NODE_OPTIONS are preserved
• Integration: verifies the env option propagates through the SDK constructor
• E2E: verifies process.env is not mutated (child-only scope)
• Agent: verifies 'cli server exited' is classified as retryable

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/htekdev/gh-hookflow/releases/latest
  • Triggering command: /usr/bin/gh gh extension install htekdev/gh-hookflow (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[Copilot]

Copilot wasn't able to review any files in this pull request.

[github-actions]

✅ Test & Coverage Summary

Tier	Tests	Passed	Failed	Skipped	Time	Stmts	Branch	Funcs	Lines
✅ Unit Tests	2119	2119	0	0	20.5s	78.4% ✅	70.2% ✅	81.0% ✅	78.9% ✅
✅ Integration L3	256	256	0	0	8.5s	33.3% ✅	30.7% ✅	32.1% ✅	33.8% ✅
✅ Integration L4-L6	80	80	0	0	1.5s	19.2% ✅	15.3% ✅	21.9% ✅	19.7% ✅
✅ Integration L7	244	244	0	0	2.1s	66.0% ✅	53.8% ✅	72.0% ✅	67.1% ✅
✅ E2E	236	236	0	0	14.6s	10.8% ✅	7.5% ❌	10.4% ❌	11.1% ✅
Total	2935	2935	0	0

📊 Unit Coverage Details (78.9% lines)

Metric	Covered / Total	Percentage
Statements	6280/8006	78.44%
Branches	3055/4352	70.19%
Functions	1246/1539	80.96%
Lines	5959/7556	78.86%

[github-actions]

Coverage Report for Unit

Status	Category	Percentage	Covered / Total
🔵	Lines	78.86%	5959 / 7556
🔵	Statements	78.44%	6280 / 8006
🔵	Functions	80.96%	1246 / 1539
🔵	Branches	70.19%	3055 / 4352

File Coverage

No changed files found.

Generated in workflow #408 for commit d5ecdef by the Vitest Coverage Report Action

[htekdev]

LGTM - File permission fixes (chmod +x) for hook scripts. All CI green.

[htekdev]

LGTM - File permission fixes (chmod +x) for hook scripts. All CI green.

[htekdev]

LGTM - File permission fixes (chmod +x) on hook scripts. All CI green, trivial change.

[htekdev]

LGTM — all 13 CI checks pass. Targeted Node 24 ExperimentalWarning fix in Copilot SDK subprocess hooks. Auto-merging.