M7.6: Hostile encounter stub + marker-scale fix — closes M7

EncounterTrigger.FindHostileTrigger now polls each tactical-mode
tick. Edge-detected by NPC actor id: a fresh hostile entering
ENCOUNTER_TRIGGER_TILES range fires the stub exactly once — console
log with name/allegiance/template, save-flash toast "Combat HUD
lands with M8 — encounter logged: {name}". Player keeps moving;
the same hostile won't re-fire until you've left the trigger ring
and come back.

Deviation from the M7 plan §6.6: the plan proposed autosaving on
hostile detect so M8 testing would have fresh combat starts. Wired
that, then walked into a wolf and got a respawn loop — SaveTo →
CaptureBody → _streamer.FlushAll evicts every loaded chunk → NPCs
respawn with fresh actor ids on the next tactical tick → fresh id
breaks edge detection → stub re-fires → autosave again → loop. The
visible symptom was grey untiled chunks and a screen-filling red
blob (an unscaled NPC marker on the spawn frame at zoom 32 renders
at ~307 screen px radius). M8 owns combat-start autosave anyway:
at that point CombatHUDScreen captures combatant state before
FlushAll, so the loop can't form. Removed the SaveTo here; comment
in code records the reason.

Marker scale stamped at construction. NPCs spawn inside _Process
(EnsureLoadedAround → OnChunkLoaded → MountNpcMarker) *after* the
per-frame counter-scale loop has already iterated _npcMarkers, so
a new marker would render at Scale=(1,1) for one frame. New
CounterScaleVec() helper reads the current camera zoom and is
stamped into Scale at marker construction (both PlayerMarker on
spawn/restore and every NpcMarker). The player path also reorders
SetInitialZoom to run BEFORE the player marker constructs so the
counter-scale picks the post-zoom value rather than the fit-zoom
default.

That closes the M7 milestone — title → wizard → worldgen → play →
pause / save / load / dialogue / hostile-stub all wired, only the
M7.4 polish items left were the bugs surfaced in play-testing.
Next: §11.1 cross-build save-bytes parity test (user-driven), then
M8 (combat HUD, inventory, level-up, shop, quest log, dungeon).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Theriapolis.Godot/Scenes/TitleScreen.cs

@@ -18,7 +18,7 @@ namespace Theriapolis.GodotHost.Scenes;
 /// </summary>
 public partial class TitleScreen : Control
 {
-    private const string VersionLabel = "PORT / GODOT · M7.5";
+    private const string VersionLabel = "PORT / GODOT · M7.6";
     private const string WizardScenePath = "res://Scenes/Wizard.tscn";
 
     public override void _Ready()