refactor(config): remove the unwired config module

Config::load was never called: the DNS-override story it carried
contradicts the actual resolver flow, and nothing in the CLI or
snap advertised a key. Delete the module and every mention of the
ecrou.yaml file in SPEC and the snap; the XDG_CONFIG_HOME redirect
in the command chain served only that file.

SPEC.md

@@ -343,8 +343,6 @@ tool.
 └── <...>.provisioned                   # hot-cell marker
 ```
 
-`~/.config/ecrou.yaml` carries over (DNS overrides today).
-
 ## Snap packaging
 
 Confinement: strict. Plugs: `network`, `home`, `kvm`. Manual

crates/ecrou/src/config.rs

@@ -1,43 +0,0 @@
-use anyhow::Context;
-
-use crate::Result;
-use serde::Deserialize;
-
-#[derive(Debug, Deserialize, Default)]
-pub struct Config {
-    #[serde(default)]
-    pub dns: Vec<String>,
-}
-
-impl Config {
-    pub fn load() -> Result<Self> {
-        let config_path = dirs::config_dir().map(|p| p.join("ecrou.yaml"));
-
-        match config_path {
-            Some(path) if path.exists() => {
-                let content =
-                    std::fs::read_to_string(&path).context("Failed to read config file")?;
-
-                let config: Config =
-                    serde_yaml::from_str(&content).context("Failed to parse config file")?;
-
-                // Set defaults
-                let config = Config {
-                    dns: if config.dns.is_empty() {
-                        vec!["1.1.1.1".to_string()]
-                    } else {
-                        config.dns
-                    },
-                };
-
-                Ok(config)
-            }
-            _ => {
-                // No config file, use defaults
-                Ok(Config {
-                    dns: vec!["1.1.1.1".to_string()],
-                })
-            }
-        }
-    }
-}

crates/ecrou/src/lib.rs

@@ -31,7 +31,6 @@
 //! embeds the library exactly the way the CLI does - a [`RootfsCache`]
 //! to prepare a rootfs, then [`run`] to boot it.
 
-pub mod config;
 pub mod distro;
 pub mod download;
 pub mod error;

snap/snapcraft.yaml

@@ -27,7 +27,6 @@ description: |
   ## Configuration and cache
 
   - image cache: `~/snap/ecrou/common/cache/ecrou`
-  - config: `~/snap/ecrou/common/config/ecrou.yaml`
 
   The home interface does not cover dotfiles, so the XDG
   directories are redirected into the snap's common data area.
@@ -58,17 +57,16 @@ parts:
     build-packages: [cmake, perl]
     override-build: |
       craftctl default
-      # The home interface stops at dotfiles, so ~/.cache and
+      # The home interface stops at dotfiles, so ~/.cache is
-      # ~/.config are unreachable under strict confinement. Point the
+      # unreachable under strict confinement. Point the XDG cache
-      # XDG lookups (the dirs crate honors these variables) into the
+      # lookup (the dirs crate honors the variable) into the snap's
-      # snap's durable area, shared across refreshes.
+      # durable area, shared across refreshes.
       mkdir -p "$CRAFT_PART_INSTALL/command-chain"
       cat > "$CRAFT_PART_INSTALL/command-chain/ecrou-env" <<'EOF'
       #!/bin/sh
       XDG_CACHE_HOME="$SNAP_USER_COMMON/cache"
-      XDG_CONFIG_HOME="$SNAP_USER_COMMON/config"
+      export XDG_CACHE_HOME
-      export XDG_CACHE_HOME XDG_CONFIG_HOME
+      mkdir -p "$XDG_CACHE_HOME"
-      mkdir -p "$XDG_CACHE_HOME" "$XDG_CONFIG_HOME"
       exec "$@"
       EOF
       chmod 755 "$CRAFT_PART_INSTALL/command-chain/ecrou-env"