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/error.rs

@@ -0,0 +1,71 @@
+//! Domain-level validation errors.
+//!
+//! These errors are raised by validating constructors (`new`/`try_new`) when an
+//! invariant documented in `ARCHITECTURE.md` §3.2 is violated. They are pure
+//! data — no I/O, no platform coupling.
+
+use thiserror::Error;
+
+/// Error raised when an entity or value object invariant is violated at
+/// construction time.
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum DomainError {
+    /// A required string field was empty.
+    #[error("field `{field}` must not be empty")]
+    EmptyField {
+        /// Name of the offending field.
+        field: &'static str,
+    },
+
+    /// A path that must be absolute was relative.
+    #[error("path `{path}` must be absolute")]
+    PathNotAbsolute {
+        /// The offending path.
+        path: String,
+    },
+
+    /// A path that must be relative was absolute, or escaped its root via `..`.
+    #[error("path `{path}` must be relative and must not contain `..`")]
+    PathNotRelativeSafe {
+        /// The offending path.
+        path: String,
+    },
+
+    /// An environment variable name was not a valid identifier.
+    #[error("`{value}` is not a valid environment variable identifier")]
+    InvalidEnvVar {
+        /// The offending value.
+        value: String,
+    },
+
+    /// An SSH port was outside the valid `1..=65535` range.
+    #[error("ssh port must be in 1..=65535, got {port}")]
+    InvalidPort {
+        /// The offending port.
+        port: u32,
+    },
+
+    /// A PTY dimension was zero.
+    #[error("pty size must have rows>0 and cols>0, got rows={rows} cols={cols}")]
+    InvalidPtySize {
+        /// Requested rows.
+        rows: u16,
+        /// Requested cols.
+        cols: u16,
+    },
+
+    /// `synchronized == true` requires an agent originating from a template.
+    #[error("a synchronized agent must originate from a template")]
+    SyncRequiresTemplate,
+
+    /// A manifest entry was inconsistent (e.g. synchronized without template metadata).
+    #[error("manifest entry inconsistent: {reason}")]
+    InconsistentManifest {
+        /// Human-readable reason.
+        reason: String,
+    },
+
+    /// A generic invariant violation with an explanatory message.
+    #[error("invariant violated: {0}")]
+    Invariant(String),
+}