feat(bridge): a Place NPCs step's "drop loot" switch (runicnpc stage 7)

world.place with a profile takes dropLoot (D296): false spawns the
NPCs with RunicNPC's {"loot":{"dropTable":false}} override, so they
keep their corpse's start but roll no table. Absent or true, as before.
runicnpc_api and RunicNpcApiNeeded are 6.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

overlay.toml

@@ -80,7 +80,7 @@ requires_plugins = ["Kits", "ZoneManager"]
 
 # ── The RunicNPC API the bridge needs ───────────────────────────────────────
 #
-# RunicNPC (docs/runicnpc/PLAN.md stages 4 to 6): the bridge's npc.* commands call
+# RunicNPC (docs/runicnpc/PLAN.md stages 4 to 7): the bridge's npc.* commands call
 # RunicNPC's API and need at least this version of it. It MUST equal
 # `RunicNpcApiNeeded` in RunicGateway.cs; `node scripts/checkPlugin.js` holds the
 # two equal. The release copies it into manifest.json, and the installer's
@@ -88,4 +88,4 @@ requires_plugins = ["Kits", "ZoneManager"]
 #
 # RunicNPC is optional to the bridge until its stage 9: without it every npc.*
 # command answers `runicnpc-missing`, and events place Rust's own scientists.
-runicnpc_api = 5
+runicnpc_api = 6