Length is now sourced from the zone graph's longest entry→boss path,
not the dice roll, so "Room X/Y" matches what the player walks. The
dice fallback stays for graphless zones.
Goblin Warrens grows to the T1 12–14 band (13-node traversal): adds the
missing Trap anchor and deepens both fork branches + the post-merge
approach. Pattern reference for the remaining zones in D1-b…d.
G1 — schema. Adds zone_node + zone_edge tables and three columns to
dnd_zone_run (current_node, visited_nodes, node_choices). Linear
columns stay during the migration; G9 retires them.
G2 — types + validator. New internal/plugin/zone_graph.go defines
ZoneNode/ZoneEdge/ZoneGraph + ZoneNodeKind/ZoneEdgeLockKind. BuildGraph
enforces: exactly one entry, exactly one boss, boss reachable via BFS,
no orphan nodes, no self-loops without explicit opt-in. BuildLinearGraph
synthesizes a chain for legacy zones.
G3 — legacy compiler + dual-mode loader. compileLegacyZoneGraph turns
a ZoneDefinition into a representative linear graph (MaxRooms shape).
loadZoneGraph returns the registered graph if hand-authored (G7+),
else the legacy fallback. compileRunGraph mirrors a per-run RoomSeq
exactly for hot-swap derivations.
G4 — run-state dual-write. DungeonRun gains CurrentNode / VisitedNodes
/ NodeChoices. scanZoneRun reads them and hot-swaps current_node from
current_room when a row predates the migration (deriveLegacyNodeID
matches BuildLinearGraph's "<zone>.r<n>" scheme). startZoneRun and
markRoomCleared write both columns.
No behavior change yet — navigation surface (forks, locked edges,
!zone go) lands in G5.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
