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.

crates/fparkan-test-support/src/lib.rs

@@ -0,0 +1,25 @@
+#![forbid(unsafe_code)]
+//! Dev-only synthetic builders and fake ports.
+
+use fparkan_render::{FrameOutput, RenderBackend, RenderCommandList, RenderError};
+
+/// Fake clock.
+#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
+pub struct FakeClock {
+    /// Current tick.
+    pub tick: u64,
+}
+
+/// Recording backend.
+#[derive(Clone, Debug, Default)]
+pub struct RecordingRenderBackend {
+    /// Recorded command lists.
+    pub captures: Vec<RenderCommandList>,
+}
+
+impl RenderBackend for RecordingRenderBackend {
+    fn execute(&mut self, commands: &RenderCommandList) -> Result<FrameOutput, RenderError> {
+        self.captures.push(commands.clone());
+        Ok(FrameOutput)
+    }
+}