test(eval): a frozen-set directory for the search gate, sets ignored not absent

`eval/soek/` is where the search gate's question sets are placed by hand. The
sets themselves are `.gitignore`d rather than committed, and that is this
repository's existing rule rather than a new one: `okf_retrieval_gate.py`
already states that a gold set names documents in someone's corpus, so it
arrives as a path and is never a constant here.

Measured before it was decided: the sets carry coordination ids and an
absolute path under a home directory, both of which this repository's own
frames forbid in a tracked file. A set that is absent is reported
`IKKE KJOERT -- fixture mangler` and counted RED, never as 0 hits and never as
a quiet pass, so a machine without them cannot read silence as a green row.

The README states the SHAPE each set must have and nothing about where any of
them came from or what any of them contains.

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

eval/soek/.gitignore

@@ -0,0 +1,16 @@
+# The frozen question sets are INPUTS, never constants in this repository.
+#
+# `tools/okf_retrieval_gate.py` states the rule this directory inherits: "a
+# gold set names documents in a consumer's corpus, so a real set arrives as a
+# path plus an expected sha256 and is never committed". The sets named here
+# additionally carry prose quoted verbatim from a consumer whose own status is
+# unsettled, and CLAUDE.md names that class as not publishable from here.
+#
+# So they are ignored, not absent: place them in this directory and the gate
+# reads them. Nothing here reaches a public mirror by accident, and the gate
+# reports `IKKE KJOERT -- fixture mangler` (RED) for any set that is not here,
+# so a machine without them cannot mistake silence for a pass.
+fase-sporsmaal.json
+holdout-sporsmaal.json
+norske-sporsmaal.json
+delsporsmaal.json