REC-100/REC-101: drop impossible gitlink requirement and fictitious RUST_LOG passthrough

deployment/idunn/recipe.toml declared required_gitlinks = ["vendor/cultcache-rs",
"vendor/cultnet-rs"], but HEAD (6519289, "Consume the core stack from CultLib
instead of forking it") already deleted both vendor directories and
.gitmodules. Idunn's TargetDeclaration::admit() (F:/Projects/Idunn/src/
deployment.rs:1390-1399) requires the operator's bound gitlink set to match
required_gitlinks exactly, so with no vendor dirs left to bind, this recipe
cannot currently be admitted at all — a live deployment defect, not just
dead text. required_gitlinks is #[serde(default)] (deployment.rs:26-27), so
dropping the line is a valid empty declaration, not a schema violation.

Also drops optional_environment = ["RUST_LOG"]: the recipe declares Idunn
may forward an operator-set RUST_LOG into the child process, but
src/provider_backend.rs:634 unconditionally overwrites it with
.env("RUST_LOG", "warn") right before spawn. The declaration currently
promises a passthrough the code never honors.

Kill attempts that failed to find a live consumer of the removed lines:
- git ls-tree origin/main -- vendor/: empty. No .gitmodules file exists.
- git grep -n "RUST_LOG" over the whole repo: only the two lines touched
  here (the recipe declaration and the hardcoded overwrite).
- Read F:/Projects/Idunn/src/deployment.rs to confirm both fields are
  optional (serde default) before cutting, per the assignment's
  instruction to understand Idunn's parser before touching recipe fields.

Collision check: git diff --stat origin/main...codex/ghostlight-release-binding
and ...codex/ghostlight-model-allowlist over deployment/idunn/recipe.toml
and src/provider_backend.rs: both empty, no in-flight work touches these
lines.

Validated deployment/idunn/recipe.toml still parses as TOML after the edit
(python tomllib load succeeded). Not touched: the RUST_LOG overwrite in
provider_backend.rs itself is a behavior question (should the child honor
an operator override?), not a dead-code cut, so it stays as-is per the
subtraction-only mandate.

REC-100, REC-101

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

deployment/idunn/recipe.toml

@@ -1,7 +1,6 @@
 schema = "gamecult.idunn.target_declaration.v1"
 target = "codex-connector"
 source_stamp_environment = "CODEX_CONNECTOR_BUILD_COMMIT"
-required_gitlinks = ["vendor/cultcache-rs", "vendor/cultnet-rs"]
 
 [[steps]]
 id = "extract-codex"
@@ -85,7 +84,6 @@ required_environment = [
   "GAMECULT_IDUNN_PROCESS_WRITE_LEASE",
   "GAMECULT_IDUNN_RUNTIME_BUNDLE",
 ]
-optional_environment = ["RUST_LOG"]
 
 [service.health]
 contract = "codex-connector.runtime-health.v1"