perf: harden runtime for weaker hardware

docs/LEARNING_ROADMAP.md

@@ -474,6 +474,13 @@ keeps identical final checksums after one reusable per-tick population view and
 improves that case from 65.84 to 85.81 ticks per second. Revisit the target when
 world presentation or LOD enters the measured workload.
 
+[Baseline 03](benchmarks/SIMULATION_SCALING_BASELINE_03.md) versions the
+workload after combat was added and corrects its fixture to require one matching
+combatant per synthetic NPC. Indexed callbacks and cached combatant iteration
+keep the now-honest 600-record workload at 90.63 ticks per second with identical
+checksums across three samples. It remains data-only; rendered scale still
+requires the active-visual workload described by this milestone.
+
 [Loaded Resource Discovery 01](benchmarks/LOADED_RESOURCE_DISCOVERY_01.md)
 proves the first real spatial consumer. Exact loaded-anchor resolution remains
 near four inspected candidates from 18 through 1,800 resources, preserves every
@@ -1015,6 +1022,17 @@ Headless tests cover combat determinism, wolf attacks, enemy definitions,
 player downing/recovery, defend duty, war motivation, raid-to-resolution
 chains, player kills, and save/restore.
 
+The subsequent runtime health pass tightened those contracts: recovery revives
+both player records, hostile strikes require melee reach and deterministic
+approach, NPC death listeners see completed authoritative death state, player
+attacks revalidate faction/exact weapon reach and use an unscaled real-time
+cooldown, raids withdraw actual pantry food, and dash has one `CharacterBody3D`
+movement owner with separate duration and re-entry cooldown. Presentation hot paths are
+bounded through the existing spatial/population indexes, 5–10 Hz UI/environment
+updates, cached combatant order, and navigation retry backoff. High, Balanced,
+and Low profiles now prove a reversible weak-PC structural budget; real
+weak-hardware frame-time/GPU/memory measurement remains intentionally open.
+
 Recently completed:
 
 - `Jajce Villager Field Note 12`: a separate player-facing note selects the