Feat: add policy composition primitives and examples #92

Job	Run time
build (Release)	21s
build (Debug)	28s
dependency health	33s
examples:governance / RedisQueries	28s
test:governance-redis	30s
test:governance	18s
examples:core / WorkflowApprovals	24s
test:core	18s
examples:core / FeatureFlags	23s
examples:governance / ApprovalWorkflow	25s
examples:governance / Queries	16s
examples:core / IamRoles	21s
examples:governance / GovernedExecution	25s
examples:governance / DecisionTaxonomy	24s
examples:core / BillingQuotas	21s
examples:governance / RequestLifecycle	25s
examples:governance / VersionedResolution	19s
validation summary	3s
	6m 42s

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