feat: implement FParkan architecture foundation

Add the modular fparkan workspace, domain crates, adapters, apps, xtask policy/CI, acceptance evidence, and licensed corpus gates for the macOS-focused roadmap foundation.

apps/fparkan-headless/src/main.rs

@@ -0,0 +1,114 @@
+#![forbid(unsafe_code)]
+#![allow(clippy::print_stderr, clippy::print_stdout)]
+//! `FParkan` headless runtime entrypoint.
+
+use fparkan_runtime::{
+    create, load_mission, step_headless, EngineConfig, EngineMode, EngineServices, MissionRequest,
+};
+use fparkan_vfs::DirectoryVfs;
+use fparkan_world::InputSnapshot;
+use std::path::PathBuf;
+use std::sync::Arc;
+
+fn main() {
+    if let Err(err) = run() {
+        eprintln!("{err}");
+        std::process::exit(2);
+    }
+}
+
+fn run() -> Result<(), String> {
+    let raw_args: Vec<String> = std::env::args().skip(1).collect();
+    let args = Args::parse(&raw_args)?;
+    let services = if let Some(root) = &args.root {
+        EngineServices::new(Arc::new(DirectoryVfs::new(root)))
+    } else {
+        EngineServices::default()
+    };
+    let mut engine = create(
+        EngineConfig {
+            mode: EngineMode::Headless,
+        },
+        services,
+    )
+    .map_err(|err| format!("{err}"))?;
+    if let Some(mission) = args.mission {
+        let loaded = load_mission(&mut engine, MissionRequest { key: mission })
+            .map_err(|err| format!("{err}"))?;
+        println!(
+            "mission objects={} areals={} surfaces={} graph_roots={} components={} wear={} material_slots={} textures={} lightmaps={} graph_failures={}",
+            loaded.object_count,
+            loaded.areal_count,
+            loaded.surface_count,
+            loaded.graph_root_count,
+            loaded.graph_unit_component_count,
+            loaded.graph_wear_resolved_count,
+            loaded.graph_material_resolved_count,
+            loaded.graph_texture_resolved_count,
+            loaded.graph_lightmap_resolved_count,
+            loaded.graph_failure_count
+        );
+    }
+    let mut last = None;
+    for _ in 0..args.ticks {
+        last = Some(step_headless(&mut engine, InputSnapshot).map_err(|err| format!("{err}"))?);
+    }
+    if let Some(frame) = last {
+        println!(
+            "tick={} hash={:02x?}",
+            frame.snapshot.tick.0, frame.snapshot.hash.0
+        );
+    }
+    Ok(())
+}
+
+struct Args {
+    root: Option<PathBuf>,
+    mission: Option<String>,
+    ticks: u64,
+}
+
+impl Args {
+    fn parse(args: &[String]) -> Result<Self, String> {
+        let mut parsed = Self {
+            root: None,
+            mission: None,
+            ticks: 1,
+        };
+        let mut iter = args.iter();
+        while let Some(arg) = iter.next() {
+            match arg.as_str() {
+                "--root" => {
+                    parsed.root = Some(
+                        iter.next()
+                            .map(PathBuf::from)
+                            .ok_or_else(|| "--root requires a path".to_string())?,
+                    );
+                }
+                "--mission" => {
+                    parsed.mission = Some(
+                        iter.next()
+                            .cloned()
+                            .ok_or_else(|| "--mission requires a path".to_string())?,
+                    );
+                }
+                "--ticks" => {
+                    parsed.ticks = iter
+                        .next()
+                        .ok_or_else(|| "--ticks requires a value".to_string())?
+                        .parse()
+                        .map_err(|_| "--ticks must be an integer".to_string())?;
+                }
+                _ => return Err(usage()),
+            }
+        }
+        if parsed.mission.is_some() && parsed.root.is_none() {
+            return Err("--mission requires --root".to_string());
+        }
+        Ok(parsed)
+    }
+}
+
+fn usage() -> String {
+    "usage: fparkan-headless [--root <path> --mission <path>] [--ticks <n>]".to_string()
+}