refactor(scripts): split monolithic module into per-script submodules

Extract shared `mkScript` and `mkScriptModule` helpers into `lib.nix`
Split each script into `modules/scripts/<name>/` with its own
  `default.nix`, `script.sh`, and `assertions.nix`
Remove `conditions` parameter from `mkScriptModule`; move condition
  assertions into per-script `assertions.nix` files with inline checks
  and error messages
Simplify `mkScriptModule` to return `{ options, moduleConfig }` instead
  of a module function, taking `config` as a direct parameter
Add `description` field to `mkScript` that inserts the description as
  a `# <text>` comment between the shebang and env vars
Thread `description` through `mkScriptModule` to each `default.nix`
Move top comment lines from each `script.sh` into the `description`
  field and remove from sources to avoid duplication
Remove old flat `.sh` files from `modules/scripts/` root

1 files changed, 7 insertions, 0 deletions

diff --git a/modules/scripts/neomutt-sync/assertions.nix b/modules/scripts/neomutt-sync/assertions.nix
new file mode 100644
index 0000000..38f48e4
--- /dev/null
+++ b/modules/scripts/neomutt-sync/assertions.nix
@@ -0,0 +1,7 @@
+{ config, ... }:
+[
+  {
+    assertion = !config.scripts.neomutt-sync.enable || config.communication.neomutt.enable;
+    message = "scripts.neomutt-sync is enabled but requires `communication.neomutt.enable`.";
+  }
+]