fix: rename seed files and IDs to match cleaned titles

All 100 seed YAML files now have:
- Filenames that match their id field
- IDs that are slugs of their titles
- No cultural identifiers in titles or IDs

70 files renamed. e.g. quaker-meeting-for-worship.yaml -> meeting-for-worship.yaml,
moroccan-jmaa-village.yaml -> jmaa-village-assembly.yaml,
japanese-hansei.yaml -> hansei-reflection.yaml

seeds/powhiri-welcoming-ceremony.yaml

@@ -0,0 +1,35 @@
+id: powhiri-welcoming-ceremony
+title: Powhiri Welcoming Ceremony
+description: >-
+  A Maori welcoming ceremony that establishes connection and the rights of
+  visitors and hosts. Originating in Aotearoa New Zealand Maori tradition,
+  the powhiri follows a fixed sequence of encounters.
+source: Te Ara Encyclopedia of New Zealand
+source_url: https://teara.govt.nz/en/powhiri
+tags: [maori, ceremony, welcome, indigenous]
+forked_from: null
+image: null
+steps:
+  - headline: Karanga (the call)
+    description: >-
+      A woman from the host group performs a call of welcome; a woman from the
+      visiting group responds. This acknowledges the living and the dead.
+  - headline: Whaikorero (formal speeches)
+    description: >-
+      Speakers from each side deliver formal orations in turn, beginning with
+      the hosts. Each speech is followed by a waiata (song) from that side.
+  - headline: Koha (gift)
+    description: >-
+      The visitors present a koha — a gift or contribution — placed on the
+      marae, representing reciprocity and gratitude.
+  - headline: Hongi (greeting)
+    description: >-
+      Hosts and visitors press noses and foreheads in the hongi, symbolising
+      the sharing of breath and the joining of the two groups.
+outcome: >-
+  Strangers become guests; the relationship between the two groups is
+  formally established and acknowledged.
+practice: >-
+  Protocols vary by iwi (tribe) and marae — follow the local kawa. Visitors
+  should arrange guidance from a local kaikaranga or kaikorero before
+  attending.