feat: Add Designer Feedback Loop and Tooling (M11.6)

content/config/overlays/aggressive_economy.yml

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+# Example Overlay: Aggressive Economy
+# Demonstrates how to use YAML overlays to test balance changes.
+#
+# This overlay increases resource regeneration and reduces scarcity pressure
+# to test how the game behaves with a more forgiving economy.
+#
+# Usage:
+#   echoes-balance-studio sweep --overlay content/config/overlays/aggressive_economy.yml
+#
+# Or use test-tuning for quick experiments:
+#   echoes-balance-studio test-tuning --name aggressive_econ \
+#       --change economy.regen_scale=1.2 \
+#       --change environment.scarcity_pressure_cap=4000
+
+name: aggressive_economy
+description: |
+  Test higher resource regeneration and reduced scarcity.
+  Use this overlay to see how the game behaves when resources
+  are more abundant and scarcity pressure is lower.
+
+overrides:
+  economy:
+    regen_scale: 1.2
+    demand_population_scale: 80000
+  environment:
+    scarcity_pressure_cap: 4000
+    scarcity_unrest_weight: 0.00003
+    scarcity_pollution_weight: 0.00002
+
+metadata:
+  author: balance_team
+  purpose: testing
+  related_issue: example

content/config/overlays/fast_pacing.yml

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+# Example Overlay: Fast Narrative Pacing
+# Demonstrates how to adjust narrative timing for testing.
+#
+# This overlay increases the rate of story seed activations
+# and reduces quiet periods between events.
+#
+# Usage:
+#   echoes-balance-studio sweep --overlay content/config/overlays/fast_pacing.yml
+
+name: fast_narrative_pacing
+description: |
+  Test faster narrative pacing with more frequent story events.
+  Use this to see how players handle increased drama density.
+
+overrides:
+  director:
+    max_active_seeds: 3
+    global_quiet_ticks: 2
+    seed_active_ticks: 4
+    seed_resolve_ticks: 2
+    seed_quiet_ticks: 3
+    story_seed_limit: 4
+
+metadata:
+  author: narrative_team
+  purpose: testing
+  related_issue: example