Move test scaffolding out of the deploy path

BridgeSeeder and BridgeProbe are not part of the bridge, but living under
overlay/Scripts/Custom/ meant deploy.ps1 would copy them onto any server we
deployed to. Move them to tools/scaffolding/, which nothing syncs.

overlay/Config/Bridge.cfg now carries the bridge's own settings (host, port,
queue cap, sweep intervals) rather than the scaffolding flags. Config.Get
returns false for a missing key, so a deployed server never runs the seeder or
probe even if their .cs files are present.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

overlay/Config/Bridge.cfg

@@ -1,14 +1,25 @@
 
-# Settings for the ServUO/sidecar bridge test scaffolding.
+# uo-link bridge settings.
+#
+# Key scope is the filename: Bridge.cfg + StatSweepSeconds => "Bridge.StatSweepSeconds".
+# Read in Configure(), which runs before World.Load.
 
-# When true, BridgeSeeder populates the world with synthetic accounts, characters,
-# houses and player vendors on ServerStarted, then saves. It refuses to run twice:
-# if the account "seed_000" already exists it does nothing.
-# Set back to False once the world is seeded.
-SeedOnStart=False
+# Loopback only. The socket being local is the trust boundary for inbound commands;
+# if the sidecar ever moves off-host, add a shared secret first.
+Host=127.0.0.1
+Port=7788
 
-# Read-only census of the seeded world on startup (see BridgeSeeder.Census).
-CensusOnStart=False
+# Outbound queue cap. On overflow the plugin drops oldest and counts the drops,
+# because a stalled sidecar must never OOM the shard.
+QueueCap=10000
 
-# Times the bridge reads against the loaded world (see BridgeProbe).
-ProbeOnStart=False
+# Sweep intervals, seconds. Measured on a 150-character shard: a vitals sweep costs
+# 0.0015 ms/char, so 1000 online players is ~1.5 ms per sweep. See docs/PLAN.md §1.
+StatSweepSeconds=30
+DecaySweepSeconds=60
+EconomySweepSeconds=300
+
+# The test scaffolding in tools/scaffolding/ reads its own flags from this file
+# (SeedOnStart, CensusOnStart, ProbeOnStart). They are absent here on purpose:
+# Config.Get returns the default of false when a key is missing, so a deployed
+# server never runs the scaffolding even if its .cs files are present.