fix: consolidate compound-docs into ce-compound skill (#390)

plugins/compound-engineering/skills/ce-compound-refresh/references/schema.yaml

@@ -0,0 +1,127 @@
+# Documentation schema for learnings written by ce:compound
+# Treat this as the canonical frontmatter contract for docs/solutions/.
+
+required_fields:
+  module:
+    type: string
+    description: "Module or area affected by the problem"
+
+  date:
+    type: string
+    pattern: '^\d{4}-\d{2}-\d{2}$'
+    description: "Date the problem was solved (YYYY-MM-DD)"
+
+  problem_type:
+    type: enum
+    values:
+      - build_error
+      - test_failure
+      - runtime_error
+      - performance_issue
+      - database_issue
+      - security_issue
+      - ui_bug
+      - integration_issue
+      - logic_error
+      - developer_experience
+      - workflow_issue
+      - best_practice
+      - documentation_gap
+    description: "Primary category of the problem"
+
+  component:
+    type: enum
+    values:
+      - rails_model
+      - rails_controller
+      - rails_view
+      - service_object
+      - background_job
+      - database
+      - frontend_stimulus
+      - hotwire_turbo
+      - email_processing
+      - brief_system
+      - assistant
+      - authentication
+      - payments
+      - development_workflow
+      - testing_framework
+      - documentation
+      - tooling
+    description: "Component involved"
+
+  symptoms:
+    type: array[string]
+    min_items: 1
+    max_items: 5
+    description: "Observable symptoms such as errors or broken behavior"
+
+  root_cause:
+    type: enum
+    values:
+      - missing_association
+      - missing_include
+      - missing_index
+      - wrong_api
+      - scope_issue
+      - thread_violation
+      - async_timing
+      - memory_leak
+      - config_error
+      - logic_error
+      - test_isolation
+      - missing_validation
+      - missing_permission
+      - missing_workflow_step
+      - inadequate_documentation
+      - missing_tooling
+      - incomplete_setup
+    description: "Fundamental technical cause of the problem"
+
+  resolution_type:
+    type: enum
+    values:
+      - code_fix
+      - migration
+      - config_change
+      - test_fix
+      - dependency_update
+      - environment_setup
+      - workflow_improvement
+      - documentation_update
+      - tooling_addition
+      - seed_data_update
+    description: "Type of fix applied"
+
+  severity:
+    type: enum
+    values:
+      - critical
+      - high
+      - medium
+      - low
+    description: "Impact severity"
+
+optional_fields:
+  rails_version:
+    type: string
+    pattern: '^\d+\.\d+\.\d+$'
+    description: "Rails version in X.Y.Z format"
+
+  related_components:
+    type: array[string]
+    description: "Other components involved"
+
+  tags:
+    type: array[string]
+    max_items: 8
+    description: "Search keywords, lowercase and hyphen-separated"
+
+validation_rules:
+  - "All required fields must be present"
+  - "Enum fields must match allowed values exactly"
+  - "symptoms must be a YAML array with 1-5 items"
+  - "date must match YYYY-MM-DD format"
+  - "rails_version, if provided, must match X.Y.Z format"
+  - "tags should be lowercase and hyphen-separated"