Phase 4: real model runners, the playable walkthrough, and a RIDGE-style menu

.gitattributes

@@ -0,0 +1,12 @@
+# Line endings are part of the reproducibility contract, not a style preference.
+# eval/scenarios.py hashes the label file's raw bytes to stamp every run, so a CRLF checkout
+# produces a different stamp for byte-identical labels and the stamp stops being verifiable
+# off the machine that made it. Normalising to LF keeps that hash, and the generated .tex
+# and .csv assets, identical on every platform.
+* text=auto eol=lf
+
+# Generated figures and the slide deck are binary. Never line-ending normalise these: the
+# .pptx is a zip archive and normalising it would corrupt the file.
+*.png binary
+*.pdf binary
+*.pptx binary

.gitignore

@@ -19,7 +19,15 @@ env/
 # Runtime data: memory databases, embeddings, run outputs (keep the folder, not the files)
 data/*
 !data/.gitkeep
+# Generated paper assets are the exception: they are deliverables, they are embedded in the
+# README, and a reviewer cloning the repo has to see them without running anything first.
+!data/figures/
+!data/tables/
 
 # OS
 .DS_Store
 .git.broken-backup/
+
+# Local secrets (API keys). Never committed.
+.env
+.env.local