CB-WP-0038: variant selection, H1 implemented, and H1 measured

ground-game packages hypotheses as selectable rules variants — a catalog,
a rules_delta.yaml, and prose — and their note is explicit that CSV text
alone is not executable here. So the kernel gains a Variant in game state:
in the state, therefore in the hash, therefore in the recording, because a
scenario replayed under a different variant would diverge silently.

Baseline is bit-for-bit what it was, asserted across seat counts and
seeds. A variant system that perturbs the baseline invalidates every
measurement this repo has.

H1-A and H1-B implemented from rules_delta.yaml and mutation-proven on
their own defects: "unclaimed" misread as face-up-and-unsolved, and the
attacker's Stress read after the attack's effects. Their `unchanged:` list
is asserted rather than trusted — that list is their claim about their own
experiment.

Measured, and three of their four criteria fail. DARVO arm rate is still
0 under greedy; ATTACK selection does not rise and falls for the rank-75
policy; group success collapses from 165/190/200 to 0 at 3/4/6 seats.
The mechanism is not the assumed one: greedy answers the pressure by
regulating, Stress plateaus at 3, so it never reaches the gate at 4 or the
arm at 5 — H1-A acts as a solve-rate tax and H1-B is unreachable under
competent play.

A harness defect was caught before the claim: sweep discarded refused
games silently and never reported its count, so "nobody won" and "nothing
played" printed identically. Reporting H1 as unwinnable on that basis
would have been the ADR-0018 family aimed at another repo's design. All
200 games ran in every cell; the zeros are real.

Chaos d8 = 8 — the window's first override, redrew L against a structural
L, so it changed nothing. Window 3 recorded in ChaosRollHistory.

NOT REVIEWED: tier L owes a separate-agent adversarial review, and no H1
result may reach ground-game until it has run.

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

editions/experiments/h1-problem-stress/metadata.json

@@ -0,0 +1,40 @@
+{
+  "dataset_id": "GROUND-DARVO-EXP-H1-0.1",
+  "variant_id": "h1-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 H1",
+  "version": "0.1-h1",
+  "status": "Experimental rules variant (not baseline)",
+  "player_count": "2–6",
+  "duration": "5–15 minutes",
+  "rounds": 5,
+  "relationship_slots_per_player": 2,
+  "description": "Experiment H1 on top of ground-darvo-r0: unsolved Problems raise everyone's Stress at Round End; high-Stress ATTACK self-soothes by 1. Hypothesis and success criteria: history/260807-attack-darvo-stress-design.md",
+  "inherits_unchanged_from_base": [
+    "Problems.csv",
+    "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"
+  ],
+  "changed_files": [
+    "Actions.csv",
+    "Rules_Text.csv",
+    "metadata.json",
+    "rules_delta.yaml",
+    "VARIANT.md"
+  ]
+}