Fix Windows dev launchers and bound captured-output cleanup

[bigboateng]

Change contract

When: A developer launches Codex or Qwen through pitot dev on Windows, or captures output from an agent that leaves a child holding its output pipe.
Before: npm .cmd launchers went directly to process execution, the dev integration tests skipped Windows, and inherited output pipes could delay cleanup and eventually report success.
After: Supported npm launchers resolve to their declared Node entrypoints with unchanged arguments. Incomplete captured output returns an error after a two-second drain limit. Native helper tests exercise runtime decisions and cleanup on all three supported operating systems.

Boundaries preserved

• Accept only the complete standard npm Node wrapper, expected package and known Codex/Qwen entrypoint. Custom wrappers fail with explicit Node invocation guidance.
• Preserve sibling node.exe precedence, direct executable invocation and the distinction between --exec field splitting and explicit argv.
• Keep runtime teardown ordering and DeepSeek's separate ACP launch path.

Evidence

Scenario or check	Expected result	Observed result
Full Go suite	Existing behavior and new native dev tests pass	Passed locally on macOS
Launcher fixtures	Global/local layout accepted; altered wrapper, package, entrypoint or missing interpreter rejected	Passed locally and on native Windows CI
Dev lifecycle	Allow/deny, exact argv, unique runtime paths; cleanup after success, failed start, nonzero exit and cancellation	Passed locally
Inherited captured output	Return an incomplete-output error without a success message	Passed locally
Formatting, static checks and maintenance tests	Pass	Passed; 227 maintenance tests, 3 platform skips
Windows, macOS and Linux CI	All checks and current agent report pass	All 49 checks passed; current report has 33 agent and 3 runtime passes

Failure and recovery

Unsupported wrappers explain how to invoke the trusted Node entrypoint explicitly. Revert this change to restore prior launch behavior if a compatibility regression appears.

Remaining limits

Only the supported plain-Node npm wrapper is recognized. Package metadata checks do not authenticate installed code. The output drain limit does not terminate arbitrary descendant processes. Tests use local helpers and replay infrastructure without model calls.

[github-actions]

Pitot coding-agent E2E

Intelligence Flow is the verification source; Pitot's public README carries the latest main status.

Agent	Ubuntu	macOS	Windows	Result	Evidence
Claude	✅ Pass · real CLI 2.1.296 · native · binary-observed anthropic messages	✅ Pass · real CLI 2.1.296 · native · binary-observed anthropic messages	✅ Pass · real CLI 2.1.296 · native · binary-observed anthropic messages	✅ Passing	All platforms are required
Cursor	✅ Pass · real CLI 2026.10.01-e373342 · native · binary-observed cursor connect proto	✅ Pass · real CLI 2026.10.01-e373342 · native · binary-observed cursor connect proto	✅ Pass · real CLI 2026.10.01-e373342 · native · binary-observed cursor connect proto	✅ Passing	All platforms are required
Codex	✅ Pass · real CLI 0.162.1 · native · binary-observed openai responses	✅ Pass · real CLI 0.162.1 · native · binary-observed openai responses	✅ Pass · real CLI 0.162.1 · native · binary-observed openai responses	✅ Passing	All platforms are required
Devin	✅ Pass · real CLI 3000.11.3 · native · binary-observed devin connect proto	✅ Pass · real CLI 3000.11.3 · native · binary-observed devin connect proto	✅ Pass · real CLI 3000.11.3 · native · binary-observed devin connect proto	✅ Passing	All platforms are required
DeepSeek Harness	✅ Pass · real CLI 0.2.0-rc.2 · native · binary-observed openai chat	✅ Pass · real CLI 0.2.0-rc.2 · native · binary-observed openai chat	✅ Pass · real CLI 0.2.0-rc.2 · native · binary-observed openai chat	✅ Passing	All platforms are required
GitHub Copilot CLI	✅ Pass · real CLI 1.0.95 · native · binary-observed openai chat	✅ Pass · real CLI 1.0.95 · native · binary-observed openai chat	✅ Pass · real CLI 1.0.95 · native · binary-observed openai chat	✅ Passing	All platforms are required
Gemini	✅ Pass · real CLI 0.63.0 · native · binary-observed gemini generate content	✅ Pass · real CLI 0.63.0 · native · binary-observed gemini generate content	✅ Pass · real CLI 0.63.0 · native · binary-observed gemini generate content	✅ Passing	All platforms are required
Kimi Code	✅ Pass · real CLI 2.1.1 · native · binary-observed openai chat	✅ Pass · real CLI 2.1.1 · native · binary-observed openai chat	✅ Pass · real CLI 2.1.1 · native · binary-observed openai chat	✅ Passing	All platforms are required
OpenCode	✅ Pass · real CLI 2.0.27 · native · binary-observed openai responses	✅ Pass · real CLI 2.0.27 · native · binary-observed openai responses	✅ Pass · real CLI 2.0.27 · native · binary-observed openai responses	✅ Passing	All platforms are required
Pi	✅ Pass · real CLI 1.1.0 · native · binary-observed openai chat	✅ Pass · real CLI 1.1.0 · native · binary-observed openai chat	✅ Pass · real CLI 1.1.0 · native · binary-observed openai chat	✅ Passing	All platforms are required
Qwen Code	✅ Pass · real CLI 0.25.1 · native · binary-observed openai chat	✅ Pass · real CLI 0.25.1 · native · binary-observed openai chat	✅ Pass · real CLI 0.25.1 · native · binary-observed openai chat	✅ Passing	All platforms are required

Runtime capabilities

Capability	Ubuntu	macOS	Windows	Result
pitot request	✅ Pass · real runtime allow/deny	✅ Pass · real runtime allow/deny	✅ Pass · real runtime allow/deny	✅ Passing

Source commit: 933d2a6250cb