0xdhx a4efa4deda test(#2665): cover the derivation and the in-process scrub ...

The single regression test exercised CLAUDE_CONFIG_DIR only, so deleting
GSD_RUNTIME or CODEX_HOME from any literal broke nothing -- a mutation of 24 of
the 27 added key-value pairs survived.

Four tests here: every configHome env var the registry declares is scrubbed;
every scrubbed key is blanked rather than merely present; the four non-registry
vars are named explicitly so deleting one is a failure rather than a silent
narrowing; and scrubConfigLocationEnv round-trips both a set and an unset var
(restoring an originally-unset var as '' would itself be a leak).

Both derivation tests assert a floor on the registry first, so a renamed registry
shape fails loudly instead of making the assertions vacuously true.

Negative-controlled against the hand-written 3-key list this PR shipped: the
parity test fails there and names all 19 missing vars.

Addresses review findings: Major 6, Minor 8.

2026-08-08 05:50:17 -05:00

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