feat: add main features

Agents for developpement added + frontend add + backend added. Git viewer created + agent and template creator + layout and project creator

crates/domain/src/markdown.rs

@@ -0,0 +1,44 @@
+//! Markdown content value object.
+
+use serde::{Deserialize, Serialize};
+
+/// A Markdown document — the content of an agent context (`.md`) or a template.
+///
+/// This is a thin newtype: the domain treats Markdown as opaque text and does
+/// not parse it. It exists to give the content a meaningful type at API
+/// boundaries (vs. a bare `String`).
+#[derive(Debug, Clone, PartialEq, Eq, Default, Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct MarkdownDoc(String);
+
+impl MarkdownDoc {
+    /// Wraps raw Markdown content (empty content is permitted).
+    #[must_use]
+    pub fn new(content: impl Into<String>) -> Self {
+        Self(content.into())
+    }
+
+    /// Returns the content as a string slice.
+    #[must_use]
+    pub fn as_str(&self) -> &str {
+        &self.0
+    }
+
+    /// Consumes the document, returning its content.
+    #[must_use]
+    pub fn into_string(self) -> String {
+        self.0
+    }
+
+    /// Returns `true` if the document is empty.
+    #[must_use]
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+}
+
+impl From<String> for MarkdownDoc {
+    fn from(s: String) -> Self {
+        Self(s)
+    }
+}