chore: replace em dashes with hyphens, add no-em-dash rule to CLAUDE.md

provision/instance.go

@@ -30,8 +30,8 @@ func CreateInstance(ctx context.Context, db *mongo.Database, name string) (*mode
 // created before payment and provisioning happens on the confirmed-payment
 // webhook. Provisioning with the placeholder's own ID keeps the id stable, so
 // the subscription's custom_data never points at a rewritten row and later
-// webhooks still resolve it. If an instance with this ID already exists — a
-// webhook retried after a partial provision — it is returned as-is rather than
+// webhooks still resolve it. If an instance with this ID already exists - a
+// webhook retried after a partial provision - it is returned as-is rather than
 // duplicated.
 //
 // The count-then-insert loop is racy on its own. It is safe only because
@@ -92,7 +92,7 @@ var ErrSlugTaken = errors.New("slug taken")
 // the slug it holds now.
 //
 // It returns the current slug unchanged when the name still derives to it, so a
-// cosmetic edit — capitalisation, punctuation, a trailing "Ltd." — is not a move
+// cosmetic edit - capitalisation, punctuation, a trailing "Ltd." - is not a move
 // and cannot collide with the instance's own slug.
 func RenameSlug(name, currentSlug string) (string, error) {
 	base, err := BaseSlug(name)
@@ -110,13 +110,13 @@ func RenameSlug(name, currentSlug string) (string, error) {
 // It returns the name and slug the control plane held BEFORE the write, and
 // those are the only correct values to unwind with. The caller's own copy of the
 // instance may be stale, and admin's copy stores slug with `omitempty`, so an
-// unwind driven from there can write an empty slug — which either mis-restores
+// unwind driven from there can write an empty slug - which either mis-restores
 // the tenant host or trips the unique index against every other slugless row.
 //
 // The count-then-update is racy on its own, and is safe for the same reason
 // CreateInstanceWithID's loop is: instances.slug carries a unique index, so a
 // lost race surfaces as a duplicate-key error. Unlike creation there is nothing
-// to retry with — the caller asked for one specific name — so it becomes
+// to retry with - the caller asked for one specific name - so it becomes
 // ErrSlugTaken. Do not remove the duplicate-key branch, and do not remove the
 // index.
 func RenameInstance(ctx context.Context, db *mongo.Database, instanceID, name string) (inst *models.Instance, prevName, prevSlug string, err error) {

provision/slug.go

@@ -2,7 +2,7 @@
 // plane and sitesvc.
 //
 // These rules used to be duplicated: the control plane owned one copy and
-// sitesvc mirrored it by hand. The copies had already drifted — sitesvc retried
+// sitesvc mirrored it by hand. The copies had already drifted - sitesvc retried
 // on a lost slug race while the control plane returned an error. This package
 // is the single definition; neither service may reimplement any of it.
 package provision