chore: pin shipped text formats to LF

Everything in this repository runs on Linux accelerator hosts, and campaign
receipts record the SHA-256 of the harness files that produced them. With Git's
default autocrlf on Windows a checkout rewrites the shell drivers with CRLF,
which breaks them outright on the target host and changes every recorded digest.

The two inventory CSVs are renormalized here because their content is unchanged;
the remaining files normalize as part of the commits that actually modify them.

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

.gitattributes

@@ -0,0 +1,12 @@
+# Everything here runs on Linux accelerator hosts, and campaign receipts record
+# the SHA-256 of the harness files they were produced by. A CRLF checkout on
+# Windows would both break the shell drivers and change every recorded digest,
+# so pin the text formats this repository ships.
+*.py text eol=lf
+*.sh text eol=lf
+*.json text eol=lf
+*.yaml text eol=lf
+*.csv text eol=lf
+*.tsv text eol=lf
+*.txt text eol=lf
+*.md text eol=lf