Add story-to-pack research and a structured situation review

Research toward building a content pack from a story corpus, kept on its own
branch and independent of the game. Records the selection experiments against
blind labels, and settles selection as gate G2 followed by a human review:
review.py writes REVIEW.md and a review.json form, apply_review.py checks the
filled form and writes situations.json for the next stage.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C6UDQ9o6L6Ey173U7XVou6

tools/story-to-pack/probe/rule-frozen.json

@@ -0,0 +1,22 @@
+{
+ "terms": [
+  [
+   "S1",
+   ">=",
+   0.61185
+  ],
+  [
+   "S6",
+   "<=",
+   0.16025
+  ]
+ ],
+ "dev": {
+  "accepted": 5,
+  "label2": 3,
+  "label1plus": 5,
+  "precision2": 0.6,
+  "precision1plus": 1.0,
+  "recall2": 0.6
+ }
+}