T08 iter 2: Reveal, Resolve, End; relations and the DARVO trigger

Round machinery, system-driven (GR-R04/R06/R08):

- GR-R06 fixed step order with GR-R07 Lead-first ordering inside a step.
  Steps 1 (GROUND), 3 (DARVO stages), 4 (INVESTIGATE) and 6 (SOLVE) are
  not implemented yet; their Actions resolve as no-ops and no scenario
  claims coverage of them.
- SUPPORT GR-A03/A04/A05 and ATTACK GR-A06..A09, with relation
  formation, flip and break per GR-L01/L03/L04 and Protection
  cancellation.
- GR-R08 End: DARVO trigger at Stress 5 in Lead order, Lead rotation,
  Round advance, per-round flags cleared.
- Stress clamps 0-5 on every application, the U2 default, so a mid-round
  spike that is reduced before End does not trigger DARVO.

Two consent-dependent rules are deliberately left out because they need
a decision command rather than a default: Bond formation (GR-L02) and
the target's flip-or-break choice on Support-through-Rivalry (GR-A05).
Both are noted in code and covered by a provisional scenario.

Fixes a defect in the T07 scaffold: relations were keyed by a tuple,
which JSON cannot use as an object key, so state_hash would have
panicked on any state holding a relation. Relation keys are now a Pair
newtype serialized as "a-b", with a regression test.

setup.patch may now create a final key so scenarios can seed open-ended
maps; a typo anywhere earlier in the path is still an error.

8 scenarios pass, 28 rules covered; 17 tests, fmt/clippy green.

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

scenarios/ground/gr-a04-bond-support.yaml

@@ -0,0 +1,48 @@
+scenario: ground/gr-a04-bond-support
+description: >
+  Support through an existing Bond: −2 Stress and the target's Freedom
+  token is readied (GR-A04, GR-F04). A Support with no relation forms no
+  Bond, because GR-L02 requires the target's consent.
+covers: [GR-A04, GR-F04, GR-L02, GR-L05]
+provisional: true
+seed: 42
+setup:
+  players: 3
+  preset: standard-3p
+  patch:
+    "lead": 0
+    "relations.0-1": Bond
+    "players.1.stress": 3
+    "players.1.freedom_ready": false
+commands:
+  - actor: P1
+    cmd: select_action
+    args: { action: SUPPORT, target: P2 }
+  # No relation with P3: Stress drops but no Bond forms without consent.
+  - actor: P2
+    cmd: select_action
+    args: { action: SUPPORT, target: P3 }
+  - actor: P3
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: SYSTEM
+    cmd: reveal
+  - actor: SYSTEM
+    cmd: resolve
+expect:
+  events:
+    - kind: StressSet
+      player: 1
+      stress: 1
+    - kind: FreedomReadied
+      player: 1
+    - kind: StressSet
+      player: 2
+      stress: 1
+  state:
+    "players.1.stress": 1
+    "players.1.freedom_ready": true
+    "players.2.stress": 1
+    # No Bond formed with P3: the relation map is unchanged.
+    "relations": { "0-1": Bond }
+  rejects: []

scenarios/ground/gr-a07-bond-flip.yaml

@@ -0,0 +1,38 @@
+scenario: ground/gr-a07-bond-flip
+description: >
+  Attack through an existing Bond: +2 Stress and the Bond flips to a
+  Rivalry (GR-A07, GR-L04).
+covers: [GR-A07, GR-L04, GR-O05]
+provisional: false
+seed: 42
+setup:
+  players: 3
+  preset: standard-3p
+  patch:
+    "lead": 0
+    "relations.0-1": Bond
+commands:
+  - actor: P1
+    cmd: select_action
+    args: { action: ATTACK, target: P2 }
+  - actor: P2
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: P3
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: SYSTEM
+    cmd: reveal
+  - actor: SYSTEM
+    cmd: resolve
+expect:
+  events:
+    - kind: StressSet
+      player: 1
+      stress: 4
+    - kind: RelationFormed
+      relation: Rivalry
+  state:
+    "players.1.stress": 4
+    "relations.0-1": Rivalry
+  rejects: []

scenarios/ground/gr-a08-rivalry-break.yaml

@@ -0,0 +1,42 @@
+scenario: ground/gr-a08-rivalry-break
+description: >
+  Attack through an existing Rivalry: +2 Stress and the relation breaks
+  (GR-A08, GR-L04). Protection absorbs a separate Attack (GR-A09).
+covers: [GR-A08, GR-A09, GR-T01]
+provisional: false
+seed: 42
+setup:
+  players: 3
+  preset: standard-3p
+  patch:
+    "lead": 0
+    "relations.0-1": Rivalry
+    "players.2.protection": 1
+commands:
+  - actor: P1
+    cmd: select_action
+    args: { action: ATTACK, target: P2 }
+  # P3 is protected, so this Attack is cancelled and costs the token.
+  - actor: P2
+    cmd: select_action
+    args: { action: ATTACK, target: P3 }
+  - actor: P3
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: SYSTEM
+    cmd: reveal
+  - actor: SYSTEM
+    cmd: resolve
+expect:
+  events:
+    - kind: StressSet
+      player: 1
+      stress: 4
+    - kind: RelationBroken
+    - kind: AttackCancelled
+      target: 2
+  state:
+    "players.1.stress": 4
+    "players.2.stress": 2
+    "players.2.protection": 0
+  rejects: []

scenarios/ground/gr-d01-darvo-trigger.yaml

@@ -0,0 +1,42 @@
+scenario: ground/gr-d01-darvo-trigger
+description: >
+  DARVO trigger: a player who ends the round at Stress 5 with the marker
+  OFF is set to DENY (GR-D01, GR-R08). Stress clamps at 5 on every
+  application (GR-F01 under the U2 default).
+covers: [GR-D01, GR-R08, GR-F01]
+provisional: true
+seed: 42
+setup:
+  players: 3
+  preset: standard-3p
+  patch:
+    "lead": 0
+    "players.1.stress": 4
+commands:
+  - actor: P1
+    cmd: select_action
+    args: { action: ATTACK, target: P2 }
+  - actor: P2
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: P3
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: SYSTEM
+    cmd: reveal
+  - actor: SYSTEM
+    cmd: resolve
+  - actor: SYSTEM
+    cmd: end_round
+expect:
+  events:
+    - kind: StressSet
+      player: 1
+      stress: 5
+    - kind: DarvoTriggered
+      player: 1
+  state:
+    "players.1.stress": 5
+    "players.1.darvo": Deny
+    "round": 2
+  rejects: []

scenarios/ground/gr-r06-round-resolve.yaml

@@ -0,0 +1,50 @@
+scenario: ground/gr-r06-round-resolve
+description: >
+  A full round: Select, Reveal, Resolve in GR-R06 step order, End. An
+  unrelated Attack raises Stress and forms a Rivalry; a Support with no
+  relation lowers Stress without forming a Bond.
+covers: [GR-R01, GR-R04, GR-R06, GR-R07, GR-R08, GR-A03, GR-A06, GR-L01, GR-L03, GR-F01]
+provisional: false
+seed: 42
+setup:
+  players: 3
+  preset: standard-3p
+  patch:
+    "lead": 0
+commands:
+  - actor: P1
+    cmd: select_action
+    args: { action: ATTACK, target: P2 }
+  - actor: P2
+    cmd: select_action
+    args: { action: SUPPORT, target: P3 }
+  - actor: P3
+    cmd: select_action
+    args: { action: GROUND }
+  - actor: SYSTEM
+    cmd: reveal
+  - actor: SYSTEM
+    cmd: resolve
+  - actor: SYSTEM
+    cmd: end_round
+expect:
+  events:
+    - kind: Revealed
+    # GR-R06: Support (step 2) resolves before Attack (step 5).
+    - kind: StressSet
+      player: 2
+      stress: 1
+    - kind: StressSet
+      player: 1
+      stress: 3
+    - kind: RelationFormed
+      relation: Rivalry
+    - kind: RoundEnded
+      round: 2
+  state:
+    "round": 2
+    "lead": 1
+    "players.1.stress": 3
+    "players.2.stress": 1
+    "step": Select
+  rejects: []