Maturity from run history, pack revision digests, attribute sets, projects and templates (RBT-WP-0008)

Also fixes run lists and scores mixing runs of different packs in one repository.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 295952@bnt-lap001
Assistant-Session: e93f64ad-516c-46eb-9666-aad8d300c477

attribute-sets/harbour-defaults.yaml

@@ -0,0 +1,8 @@
+spec: attribute-set/v0.1
+id: harbour-defaults
+title: Defaults for any harbour lighthouse
+attributes:
+  lamp: paraffin
+  signal: horn
+  motto: Steady light for those at sea
+  keeper: {requirement: required, note: Who keeps this light. Needed before the story can start.}

attribute-sets/stormy-coast.yaml

@@ -0,0 +1,8 @@
+spec: attribute-set/v0.1
+id: stormy-coast
+title: A coast with bad weather
+extends: [harbour-defaults]
+attributes:
+  weather: storm
+  signal: flags
+  lamp: electric