fix(@projects/@magic-civilization): 🐛 reconcile dangling tech/unit content refs (data_integrity)

Tech unlocks + a unit tech-gate referenced ids absent from the loaded set:
- improvement renames (techs used stale ids): irrigation_channel→irrigation,
  stone_road→road, fortress→fort
- improvement refs with no existing target removed: orchard, aqueduct_channel,
  bridge, fishing_boats (no such improvement is authored)
- flight units (dwarf_gyrocopter/iron_hawk/mithril_hawk) exist + their unlock
  techs are in-scope, but weren't in the manifest's units subscription → added
- dwarf_master_engineer.tech_required deep_engineering (nonexistent) → total_war
  (its grand_engineer upgrade-from's gate, which is subscribed)

GUT: test_data_integrity 0 dangling refs (724 passing / 2 failing).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

public/games/age-of-dwarves/manifest.json

@@ -15,9 +15,9 @@
       "archer",
       "ballista_crew",
       "bard",
-      "battle_priest",
       "basilisk_wild",
       "battle_medic",
+      "battle_priest",
       "beacon_bearer",
       "berserker",
       "boar_scout",
@@ -64,16 +64,19 @@
       "dwarf_grand_scout",
       "dwarf_grand_smith",
       "dwarf_graven_warrior",
+      "dwarf_gyrocopter",
       "dwarf_hammerguard",
       "dwarf_high_engineer",
       "dwarf_high_sapper",
       "dwarf_high_smith",
+      "dwarf_iron_hawk",
       "dwarf_iron_submarine",
       "dwarf_iron_vanguard",
       "dwarf_ironwarden",
       "dwarf_master_engineer",
       "dwarf_master_woodcutter",
       "dwarf_mithril_cruiser",
+      "dwarf_mithril_hawk",
       "dwarf_mithril_vanguard",
       "dwarf_prospector",
       "dwarf_repeating_arbalest",
@@ -143,8 +146,8 @@
       "rune_scribe",
       "rune_spear",
       "runesmith",
-      "sage",
       "saga_singer",
+      "sage",
       "shambling_dead",
       "shield_bearer",
       "soulbolt",

public/resources/techs/agriculture.json

@@ -47,7 +47,7 @@
       ],
       "units": [],
       "improvements": [
-        "irrigation_channel"
+        "irrigation"
       ],
       "lenses": [
         "moisture"

public/resources/techs/masonry.json

@@ -49,7 +49,7 @@
         "dwarf_engineer"
       ],
       "improvements": [
-        "stone_road"
+        "road"
       ]
     },
     "flavor": "A dwarf who cannot lay a straight wall is not yet a dwarf.",
@@ -81,7 +81,7 @@
       ],
       "units": [],
       "improvements": [
-        "fortress"
+        "fort"
       ]
     },
     "flavor": "They brought ten thousand. We brought walls.",
@@ -113,9 +113,7 @@
         "eternal_deeproads"
       ],
       "units": [],
-      "improvements": [
-        "bridge"
-      ],
+      "improvements": [],
       "mechanics": [
         {
           "key": "city_connection_roads",

public/resources/techs/natural_philosophy.json

@@ -85,8 +85,7 @@
       "buildings": [],
       "units": [],
       "improvements": [
-        "plantation",
-        "orchard"
+        "plantation"
       ],
       "lenses": [
         "tile_quality_full"
@@ -129,9 +128,7 @@
       "units": [
         "dwarf_river_galley"
       ],
-      "improvements": [
-        "fishing_boats"
-      ],
+      "improvements": [],
       "lenses": [
         "marine_health"
       ],
@@ -357,9 +354,7 @@
         "deep_cistern"
       ],
       "units": [],
-      "improvements": [
-        "aqueduct_channel"
-      ],
+      "improvements": [],
       "lenses": [
         "aquifer_mapping"
       ],

public/resources/units/dwarf_master_engineer.json

@@ -18,7 +18,7 @@
   "movement": 2,
   "vision": 2,
   "cost": 300,
-  "tech_required": "deep_engineering",
+  "tech_required": "total_war",
   "upgradeable_from": "dwarf_grand_engineer",
   "race_required": "dwarf",
   "faction": "dwarf",