init: archlens — architecture diagram generator

Hex arch + DDD, tree-sitter parsing, Mermaid/ASCII output.
Supports Rust + Python. 92 tests. CI, diff, --check for staleness detection.

crates/presentation/src/cli.rs

@@ -0,0 +1,61 @@
+use std::path::PathBuf;
+
+use clap::{Parser, Subcommand};
+
+#[derive(Parser, Debug)]
+#[command(
+    name = "archlens",
+    about = "Generate architecture diagrams from source code"
+)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Option<Command>,
+
+    #[arg(default_value = ".")]
+    pub path: PathBuf,
+
+    #[arg(long, default_value = "module")]
+    pub level: String,
+
+    #[arg(long, default_value = "mermaid")]
+    pub format: String,
+
+    #[arg(long)]
+    pub output: Option<String>,
+
+    #[arg(long)]
+    pub config: Option<String>,
+
+    #[arg(long)]
+    pub scope: Option<String>,
+
+    #[arg(long)]
+    pub exclude: Vec<String>,
+
+    #[arg(long)]
+    pub split_by_module: bool,
+
+    #[arg(long)]
+    pub strict: bool,
+
+    #[arg(
+        long,
+        help = "Check if output matches existing file, exit 1 if different"
+    )]
+    pub check: bool,
+
+    #[arg(short, long, action = clap::ArgAction::Count)]
+    pub verbose: u8,
+}
+
+#[derive(Subcommand, Debug)]
+pub enum Command {
+    Init {
+        #[arg(default_value = ".")]
+        path: PathBuf,
+    },
+    Diff {
+        #[arg(help = "Path to existing diagram file to compare against")]
+        existing: PathBuf,
+    },
+}