Restructure balancing docs into docs/balancing/

bin/app/data/config/recipes.toml

@@ -1,7 +1,7 @@
 # recipes.toml
 #
-# Production tree v2 (see docs/content_design.md, "Production tree v2" and
-# "Numbers — first pass"). Quantities and durations are tuned so that every
+# Production tree v2 (structure in docs/content_design.md, numbers with
+# derivations in docs/balancing/derived.md). Quantities and durations are tuned so that every
 # fitted ship lands on the threat-cost ladder and the ratio curve is
 # realized: tier 1 ratios are 1:1, tier 2 ratios are 2:3, tier 3+ ratios
 # are deliberately strange.
@@ -14,7 +14,7 @@
 #                                   rock IS ore)
 #   mid    + quartz                 geode deposits in expansion territory
 #                                   (deposit gating pending — see action
-#                                   item 5 in docs/progression_design.md;
+#                                   item 5 in docs/balancing/README.md;
 #                                   until then quartz mines anywhere)
 #   late   + voidsteel              battle-forged: ONLY from reprocessing
 #                                   salvaged scrap, so capital production
@@ -141,7 +141,7 @@ outputs = [{item = "copper_coil", amount = 1}]
 duration_seconds = 1.5
 
 # Depth-3 chain (ore -> ingot -> plate -> block) is the factory's
-# doubling-time knob; see the block economy rules in progression_design.md.
+# doubling-time knob; see the block economy rules in docs/balancing/rules.md.
 # Explicitly unlocked at start (-1): building blocks appear in no
 # schematic's materials, so implicit unlocking can never reach this recipe.
 [[recipe]]

bin/app/data/config/stations.toml

@@ -1,6 +1,6 @@
 # stations.toml
 #
-# Combat-pass anchors (see docs/content_design.md, "Combat stat anchors"):
+# Combat-pass anchors (see docs/balancing/targets.md, "Combat anchors"):
 # a fresh player defence station holds one early parity wave unaided; the
 # enemy station at level 0 matches the player station exactly and scales
 # with the push level x. Station scrap drops stay authored (pushing rewards

bin/app/data/config/world.toml

@@ -19,6 +19,8 @@ enemy_buffer_width_tiles = 20
 
 [expansion]
 columns_per_expansion_tiles = 10
+# x = expansions already purchased; ~1 per cycle mid-game, decelerating
+# to 2-3 cycles late (docs/balancing/derived.md).
 cost_building_blocks_formula = "300 + 50*x + 10*x*x"
 
 [push]
@@ -35,7 +37,7 @@ artifact_chance_formula = "0.05 * x"  # 5% chance per station level
 artifact_win_count      = 5
 
 [waves]
-# Tuned against the factory-size curve (content_design.md, balancing
+# Tuned against the factory-size curve (docs/balancing/targets.md, balancing
 # targets): stays below the player's achievable military output early,
 # crosses it around the late boundary (~cycle 15), overwhelms by ~24.
 threat_rate_formula = "2*x + 0.15*x*x"