CB-WP-0042 T01-T04: H2's scoped stress, with the named defects caught

H2 is ground-game's answer to our H1 reading — that a flat +1 to every
seat is a solve-rate tax scaling with the number of Problems. Unclaimed
Problems now tick only the seats in scope: global (all), personal (the
owner), bond (the owner's Bond network over Bond edges only, degree 0
falling back to personal), assigned by hidden priority so 2p never has the
bond card in play.

T01: the package is vendored with digests, and H2's Problems.csv is r0's
with one column added and NOTHING else changed — checked, not assumed,
because the delta claims deal_and_thresholds unchanged and a silent
difference would make every H2-vs-baseline comparison a comparison of two
boards as well as two rule sets. Scopes are read from the column, not
derived from the priority in Rust: F25 exists because we hardcoded numbers
the edition already carried.

T02: owner and scope are new ProblemState fields, both Option and both
skipped when None, so a baseline state serialises without them and every
recorded scenario's hash is untouched — asserted on the JSON, not assumed.
with_variant() replaces the bare field write, because state.variant = v
would leave owners unassigned: a silently wrong game rather than a failing
one.

T03: every named defect is mutation-proven — traversing Rivalry edges,
applying stacking once, a degree-0 owner ticking everyone, personal
hitting everyone. The degree-0 mutation MISSED first: the fallback lives
inside bond_network and the mutation broke the None-owner arm instead, a
different branch. It stayed green until aimed at the path the test
exercises. A mutation that misses is not evidence the test works.

T04: ownership is not a permission. Filtering SOLVE to the owner turns it
red, which is the regression this task exists for — the engine had no
owner concept before T02 added one.

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

editions/experiments/h2-scoped-problem-stress/metadata.json

@@ -0,0 +1,40 @@
+{
+  "dataset_id": "GROUND-DARVO-EXP-H2-0.1",
+  "variant_id": "h2-scoped-problem-stress",
+  "base_variant_id": "ground-darvo-r0",
+  "base_path": "editions/ground-darvo-r0",
+  "game_title": "GROUND",
+  "subtitle": "A Game of Bonds and Rivalry",
+  "edition": "DARVO Edition — experiment H2",
+  "version": "0.1-h2",
+  "status": "Experimental rules variant (not baseline)",
+  "player_count": "2–6",
+  "duration": "5–15 minutes",
+  "rounds": 5,
+  "relationship_slots_per_player": 2,
+  "description": "Experiment H2: unclaimed Problems apply End Stress only to stress_scope (personal / bond / global). Bond scope taxes the Bond network so bonded seats share incentive to SOLVE. Not stacked on H1. Design: history/260808-h2-scoped-problem-stress.md",
+  "inherits_unchanged_from_base": [
+    "Solutions.csv",
+    "Modes.csv",
+    "Scenarios.csv",
+    "Tokens.csv",
+    "DARVO.csv",
+    "Relations.csv",
+    "Player_Mats.csv",
+    "Glossary.csv",
+    "Extensions.csv",
+    "BOM.csv",
+    "Print_Manifest.csv",
+    "Symbols.csv",
+    "Back_Designs.csv",
+    "Design_Tokens.csv",
+    "Actions.csv"
+  ],
+  "changed_files": [
+    "Problems.csv",
+    "Rules_Text.csv",
+    "metadata.json",
+    "rules_delta.yaml",
+    "VARIANT.md"
+  ]
+}