Document Batch 4D archaeology and add README title image outside LFS.

Exclude REALMSINRUIN_TITLE_DEV.png from Git LFS so the README hero renders on Gitea.

Co-authored-by: Cursor <cursoragent@cursor.com>

Documentation/Archaeology/02-ProjectArchitecture.md

@@ -5,11 +5,11 @@
 - **Scope:** Project modules, targets, Build.cs dependencies, plugins (engine + project-local), gameplay-relevant configuration (maps, tags, input, networking, GAS-related settings), engine vs project boundaries.
 - **Inspection method:** Read-only inspection of `.uproject`, Target.cs, Build.cs, module startup, plugin descriptors, `Config/*.ini`, and PluginToolset (`ListEnabledPlugins`, `GetPluginInfo`, `IsEnabled`).
 - **Evidence classifications used:** Observed Implementation, Documented Intent, Inferred, Unknown.
-- **Tool or visibility limitations:** No Git repository at project root (filesystem integrity used). PluginToolset `ListEnabledPlugins` returns the full editor-enabled set (engine + project). No `OnlineSubsystem` / Steam settings found under `Config/`. SemanticSearch not used.
+- **Tool or visibility limitations:** PluginToolset `ListEnabledPlugins` returns the full editor-enabled set (engine + project). No `OnlineSubsystem` / Steam settings found under `Config/` (Pass 4 reconfirmed). Map World Settings GameMode not in asset-registry tags — inferred from package dependencies. SemanticSearch not used.
 - **Last updated:** 2026-07-16
 - **Current phase:** Phase 1 — Static Architecture
-- **Last completed pass:** Pass 1 (Batch 1)
-- **Next pass expected to contribute:** Batch 4 Pass 10 (map/GameMode relationships); Batch 4 Pass 4 (session usage confirmation)
+- **Last completed pass:** Pass 4 + Pass 10 (Batch 4D)
+- **Next pass expected to contribute:** Pass 11 when authorized
 
 ## Draft tracking
 
@@ -20,27 +20,44 @@
 - Advanced Sessions / Advanced Steam Sessions descriptors
 - DefaultEngine / DefaultGame / DefaultGameplayTags / DefaultInput highlights
 - CoreRedirects (GAS* → RIR* rename evidence)
+- **Pass 4:** Per-map GameMode via deps; GameDefaultMap/EditorStartupMap; GI unwired; OnlineSubsystem INI negative inventory; production AdvancedSessions node consumers
 
 ### Pending sections
-- Per-map GameMode assignment (requires map World Settings / asset inspection without loading levels)
-- Confirmation of which enabled engine plugins are referenced by live gameplay content
-- OnlineSubsystem / Steam runtime configuration location
+- Confirmation of which other enabled engine plugins are referenced by live gameplay content
+- Runtime OnlineSubsystem default platform when INI keys absent
 
 ### Evidence still required
-- Map asset tags / World Settings for `MainMenu`, `Test01`, `Dev_Island`, character-select maps
-- Whether `NetworkPrediction` / `OnlineFramework` / `AbilitySystemGameFeatureActions` are used by project Blueprints or only enabled
+- Whether JoinSession travels without explicit ClientTravel pin
+- Steam runtime defaults
 
 ### Tool or visibility limitations
-- Cannot load levels; map GameMode must come from asset metadata / config
-- Full enabled-plugin list is large; usage confirmation deferred to later batches
+- Map World Settings GameMode tags unavailable; dependency inference used
+- Full enabled-plugin list is large
 
 ### Unknowns requiring later verification
-- Where GameInstance class is configured (`GI_Dungeoneer` discovered via subclass search; not set in inspected DefaultEngine.ini)
-- GlobalDefaultGameMode absent from DefaultEngine.ini — GameMode likely per-map
+- `GI_Dungeoneer` not assigned via `GameInstanceClass` and has 0 referencers — Present but Unconnected
+- GlobalDefaultGameMode absent — per-map overrides only
 - No project OnlineSubsystem INI under `Config/`
 
 ---
 
+## Pass 4 — Maps, GameModes, sessions, config (Batch 4D)
+
+**Observed Implementation**
+
+| Topic | Finding |
+|-------|---------|
+| Startup maps | `GameDefaultMap=/Game/_Main/Levels/Maps/MainMenu.MainMenu`; `EditorStartupMap=/Game/_Main/Levels/Testing/Test01.Test01` |
+| Map → GameMode (deps) | MainMenu→`GM_MainMenu`; Test01 / Dev_Island / LEVEL_01→`GM_Dungeoneer` |
+| GameInstance | `GI_Dungeoneer` empty; **not** in `GameInstanceClass`; 0 asset referencers |
+| Sessions | Production create/find/join in `PC_MainMenu` / `WBP_MainMenu` / `WBP_GameSlot`; example BP 0 refs |
+| OnlineSubsystem INI | **Absent** from project `Config/*.ini` and plugin Config greps |
+| DefaultPawn | `GM_Dungeoneer` DefaultPawn=None; pawn from character-select SpawnActor+Possess |
+
+Full matrices: `11-UI-HUD-And-Sessions.md`.
+
+---
+
 ## 1. Project descriptor
 
 **Observed Implementation** — [`REALMSINRUIN_DEV.uproject`](REALMSINRUIN_DEV.uproject)