fix(vectors): pin conformance vectors to LF with .gitattributes (#1160)

.gitattributes

@@ -0,0 +1,11 @@
+# Auto-detect text files and normalize line endings to LF on commit and checkout
+* text=auto eol=lf
+
+# Conformance vector fixtures must preserve exact byte stability across
+# platforms. Scope -text to the generated corpus only (packs/, capsules/,
+# and the two JSON indexes) so the Python gates and README that enforce
+# that stability stay under LF normalization themselves.
+spec/vectors/packs/** -text
+spec/vectors/capsules/** -text
+spec/vectors/index.json -text
+spec/vectors/capsules.json -text

spec/vectors/build.py

@@ -217,12 +217,12 @@ def write_pack(
     correct = pack_integrity(hashed_manifest, engram_bytes)
 
     if integrity is True:
-        (d / "INTEGRITY").write_text(correct + "\n")
+        (d / "INTEGRITY").write_bytes((correct + "\n").encode("utf-8"))
         shipped = correct
     elif integrity is None:
         shipped = None
     else:
-        (d / "INTEGRITY").write_text(str(integrity) + "\n")
+        (d / "INTEGRITY").write_bytes((str(integrity) + "\n").encode("utf-8"))
         shipped = str(integrity)
 
     for rel, content in (extra_files or {}).items():
@@ -527,7 +527,7 @@ def main() -> int:
 
     PACKS.mkdir(exist_ok=True)
     vectors = build(PACKS)
-    INDEX.write_text(index_document(vectors), encoding="utf-8")
+    INDEX.write_bytes(index_document(vectors).encode("utf-8"))
     print(f"Built {len(vectors)} vectors into {PACKS}")
     return 0
 

spec/vectors/build_capsules.py

@@ -285,7 +285,7 @@ def main() -> int:
             return 0
 
     index = build(OUT)
-    INDEX.write_text(capsules_document(index), encoding="utf-8")
+    INDEX.write_bytes(capsules_document(index).encode("utf-8"))
     print(f"Built {len(index)} capsule fixtures into {OUT}")
     return 0