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SharedKernel contracts (so Assembler stays decoupled): IAgentRunContextProvider (agent + task) and ISkillCatalog (skill prompts by key). Implemented by OrgBoard (AgentRunContextProvider) and Skills (SkillCatalog). Assembler: - PromptAssembler builds house-style + identity + the agent's skill bodies + the task, and derives the primary action + risk from the agent's first skill. RAG/working-memory join at M6. - AgentRunExecutor (real): resolve context + skills → assemble → resolve BYOK config (with fallback) → call IModelClient → parse into action + risk → capture all on the AgentRun. Verified: build green; ArchitectureTests 8/8; IntegrationTests 29/29 — incl. the M4 acceptance: assigning a Spec task to Aria (PO, gated, stub BYOK) yields a Completed run with the assembled prompt (skill body + task title), action "write-spec", risk "Draft", and model output. Nothing executes — the gate is M5. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>