T08 iter 5: the DARVO sequence machine

Resolution step 3 (GR-R06), the last unimplemented step:

- GR-D02 binding: one stage per consecutive round, DENY then ATTACK
  then REVERSE, regardless of the player's later Stress.
- GR-D03 DENY: turn one face-up, unsolved, unprotected Problem face
  down and Deny it. Under the U3 default no legal target is a no-op and
  the sequence still advances.
- GR-D04 ATTACK: one extra Attack under the normal relation rules, then
  place the Focus token beside the target even if it was cancelled.
- GR-D05 REVERSE: flip Focus to Blame, +1 Stress to the holder, one
  Protection to the owner, unless the holder's GROUND-ND rejects it.
  Under the U5 default the owner takes -2 either way and the sequence
  ends.
- GR-D06 early end: a Support through a Bond that predates this round's
  Support step cancels the stage and ends the sequence, and the placed
  Focus token is removed. GROUND-GR ends it after the stage resolves.
- GR-D07: the marker returns to OFF, so a later End can re-trigger.

The Attack rules are now one routine shared by the chosen ATTACK Action
and the DARVO extra Attack, so GR-A06..A09 cannot drift between them.

Stage targets are named by their own command during Reveal, validated
against what the stage admits: DENY needs an eligible Problem, ATTACK
another player, and only a player with a live sequence may choose.

18 scenarios pass; AM-1 coverage 47/58 (81%), up from 41/58.

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

scenarios/ground/gr-d06-darvo-early-end.yaml

@@ -0,0 +1,43 @@
+scenario: ground/gr-d06-darvo-early-end
+description: >
+  A Support through a Bond that existed before this round cancels the
+  current stage and ends the sequence; the placed Focus token is removed
+  (GR-D06, GR-A04, GR-L05).
+covers: [GR-D06, GR-L05]
+provisional: false
+seed: 42
+setup:
+  players: 3
+  preset: standard-3p
+  patch:
+    "lead": 0
+    "players.0.darvo": Attack
+    "focus.0": 2
+    "relations.0-1": Bond
+commands:
+  - actor: P2
+    cmd: select_action
+    args: { action: SUPPORT, target: P1 }
+  - actor: P1
+    cmd: select_action
+    args: { action: INVESTIGATE, problem: 3 }
+  - actor: P3
+    cmd: select_action
+    args: { action: INVESTIGATE, problem: 3 }
+  - actor: SYSTEM
+    cmd: reveal
+  - actor: P1
+    cmd: choose_darvo_target
+    args: { target: P3 }
+  - actor: SYSTEM
+    cmd: resolve
+expect:
+  events:
+    - kind: DarvoEnded
+      player: 0
+  state:
+    "players.0.darvo": Off
+    # GR-D06: the stage never fired, so P3 took no extra Attack.
+    "players.2.stress": 2
+    "focus": {}
+  rejects: []