Close exec() once, so remote delivery stops raising SyntaxError

[scgopi]

The bug

Every remote delivery has been a silent no-op since 2026-09-15. On remote hosts and Codespaces there is no ~/.graphcode/bin/graphcode, no briefing, no wake digest and no PROMPT.md — for the whole of 0.1.73.

f6b8af41 (the Windows daemon port) rewrote the installer's embedded python into an exec('def w(p,c): …') helper and closed the call twice. The emitted program ends:

exec('def w(p,c):\n … 0o644)\n')');
                            ^ stray quote and paren

Python raises SyntaxError before writing a byte. The fragment ends in >/dev/null 2>&1 || true, so nothing on the Mac ever saw it.

This is the real cause of both symptoms reported today: a Codespace with no CLI shim, and a loop whose entire brief was a pointer at a PROMPT.md that was never delivered.

Measured

Reconstructing the exact emitted program from the Swift source and running it:

Source	Result
f6b8af41^ (before the Windows port)	exit 0, file written
origin/main today	exit 1, SyntaxError, nothing written
this branch	exit 0, shim written mode 0755, briefing written, receipt written

Why no test caught it

Every existing test asserts on the script as text: that it mentions python3, that its base64 manifest decodes, that it is || trued. None of that notices a program python refuses to parse.

RemoteInstallerExecutionTests runs the real fragment under /bin/sh against a scratch HOME and asserts on what landed — contents, the shim's executable bit, the receipt — plus py_compile on the delivered shim, and both halves of the neutered/un-neutered exit-status contract. Skipped, never silently passed, if python3 is absent.

Verification

Step	Result
xcodebuild -scheme graphcode test	exit=0, ** TEST SUCCEEDED **, Test run with 1903 tests in 200 suites passed
xcodebuild -scheme graphcode-cli build	exit=0
xcodebuild -scheme graphcoded build	exit=0
swiftlint lint	0 errors
swift format lint --recursive --strict	exit=0

TDD evidence

RED: restore the stray quote and run xcodebuild -only-testing:graphcodeTests/RemoteInstallerExecutionTests -> exit=65, theInstallerActuallyWritesEveryFileItCarries fails 5 expectations and aDeliveredShimIsAProgramPythonCanRun fails 2

GREEN: xcodebuild -scheme graphcode -destination platform=macOS test -> exit=0, ** TEST SUCCEEDED **, Test run with 1903 tests in 200 suites passed

REGRESSION: full suite plus graphcode-cli and graphcoded builds, swiftlint and swift format lint -> exit=0 on every step, 0 lint errors, the 1900 pre-existing tests all still pass