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/agile-retrospective.yaml

@@ -0,0 +1,39 @@
+id: agile-retrospective
+title: Agile Retrospective
+description: >-
+  A five-step team reflection meeting held at the end of an iteration to
+  improve process. Formalised in the Agile software development tradition,
+  drawing on Norm Kerth's retrospective prime directive.
+source: Esther Derby and Diana Larsen, "Agile Retrospectives"
+source_url: https://www.agileretrospectives.com/
+tags: [agile, retrospective, teams, improvement]
+forked_from: null
+image: null
+steps:
+  - headline: Set the stage
+    description: >-
+      The facilitator states the retrospective prime directive and checks in
+      each person briefly, setting psychological safety.
+  - headline: Gather data
+    description: >-
+      The team collects what happened during the iteration — events,
+      metrics, feelings — without interpretation.
+  - headline: Generate insights
+    description: >-
+      The team analyses the data for patterns and root causes, asking why
+      things happened as they did.
+  - headline: Decide what to do
+    description: >-
+      The team selects one or two actionable improvements for the next
+      iteration, with owners and due dates.
+  - headline: Close
+    description: >-
+      The facilitator closes with appreciation and a check on how the
+      retrospective itself went.
+outcome: >-
+  The team commits to one or two concrete improvements owned by named
+  people, with shared understanding of why.
+practice: >-
+  The prime directive matters: "Regardless of what we discover, we
+  understand and truly believe that everyone did the best job they could."
+  It prevents blame.