game_data: typed loaders for the combat / character / mission tables

Decode Project Sylpheed's IDXD data model into plain, cloneable structs
(from GP_MAIN_GAME_E.pak; the D/F/I/J/S paks are localized dups):

- Weapon (121), CraftUnit (89, with the AI flight model in .fields),
  Vessel (23, structural component counts), PlayerConfig (24) — the
  full combat balance.
- Character (68 — faction + portrait set), Stage (29 missions:
  location, phases, and the per-stage resource tables it wires up).
- Generic Record / load_records(schema) reads any of the 105 IDXD
  schemas without a bespoke struct.

Each blob = one entity; token[0] names the table, fields are
value-before-key. Named Option<> fields for the common stats + a full
`fields` map; defaulted fields stay None (they're code-resident, not on
disc — honest blanks, never guessed). 8 tests against the real disc.

Examples: iso_map / deep_map census the ISO's formats and IDXD schemas;
dm_extract / dm_rows / dm_roster / mission_map dump the decoded data.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/sylpheed-formats/examples/dm_rows.rs

@@ -0,0 +1,14 @@
+use sylpheed_formats::{idxd::IdxdObject, PakArchive};
+fn short(s:&str)->String{ s.trim_start_matches("Weapon_").trim_start_matches("UN_").trim_start_matches("UnitName_UN_").into() }
+fn g<'a>(o:&'a IdxdObject,k:&str)->String{ o.get_f32(k).map(|v|{if v==v.trunc(){format!("{}",v as i64)}else{format!("{v}")}}).or_else(||o.get_raw(k).filter(|x|x.chars().next().map(|c|c.is_ascii_digit()).unwrap_or(false)).map(|s|s.to_string())).unwrap_or("·".into()) }
+fn main(){
+    let disc=std::env::var("SYLPHEED_DISC").unwrap();
+    let arc=PakArchive::open(format!("{disc}/dat/GP_MAIN_GAME_E.pak")).unwrap();
+    let recs=|want:u32|->Vec<IdxdObject>{ arc.entries().iter().filter_map(|e|arc.read(e).ok()).filter_map(|b|IdxdObject::parse(&b).ok()).filter(|o|o.schema_hash==want).collect() };
+    println!("### WEAPONS  (name | target | load | int | power | vel | range | trig)");
+    for o in recs(0x6ab4825a).iter().take(16){ println!("{:<34}\t{}\t{}\t{}\t{}\t{}\t{}\t{}", short(o.get_raw("ID").unwrap_or("?")), o.get_raw("TargetType").unwrap_or("·"), g(o,"LoadingCount"),g(o,"Interval"),g(o,"Power"),g(o,"Velocity"),g(o,"MaximumRange"),g(o,"TriggerShotCount")); }
+    println!("\n### UNITS/CRAFT  (name | HP | cruise | accel | radar | turrets | score)");
+    for o in recs(0x43faa517).iter().take(16){ println!("{:<38}\t{}\t{}\t{}\t{}\t{}\t{}", short(o.get_raw("ID").unwrap_or("?")), g(o,"HP"),g(o,"CruisingVelocity"),g(o,"Acceleration"),g(o,"RadarRange"),g(o,"TurretCount"),g(o,"ScorePoint")); }
+    println!("\n### VESSELS/CAPITAL SHIPS  (name | HP | Sz_X | Sz_Z | radar | turrets | bridges | hatches | shieldgen | thrusters)");
+    for o in recs(0x3c5b0549).iter(){ println!("{:<30}\t{}\t{}\t{}\t{}\t{}\t{}\t{}\t{}\t{}", short(o.get_raw("ID").unwrap_or("?")), g(o,"HP"),g(o,"Size_X"),g(o,"Size_Z"),g(o,"RadarRange"),g(o,"TurretCount"),g(o,"BridgeCount"),g(o,"HatchCount"),g(o,"ShieldGeneratorCount"),g(o,"ThrusterCount")); }
+}