feat: Rebrand Sisyphus to Starlight (Lumina-Nero Architecture)

Complete rebranding of the orchestration engine from Sisyphus/Orakis
terminology to Arcanea's Lumina-Nero/Starlight Architecture:

- Sisyphus -> Starlight (relentless orchestration engine)
- Sisyphus-Junior -> Starlight-Apprentice (focused executor)
- Sisyphus-Orakis -> Starlight Engine (Lumina-Nero Architecture)

New files:
- src/agents/starlight.ts - Main Starlight orchestrator agent
- src/agents/starlight-apprentice.ts - Focused Starlight executor
- src/orchestration/starlight/ - New orchestration engine

The Starlight Engine embodies:
- Lumina's creative light (wisdom, building, expansion)
- Nero's profound darkness (debugging, analysis, mystery)
- Guardian domain expertise
- Elemental Spirit parallel execution

Backward compatibility maintained via aliases:
- createSisyphusAgent -> createStarlightAgent
- createSisyphusJuniorAgentWithOverrides -> createStarlightApprenticeAgentWithOverrides
- SisyphusOrchestratorConfig -> StarlightOrchestratorConfig

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Frank (Arcanea)

src/agents/index.ts

@@ -1,12 +1,26 @@
 export * from "./types"
 export { createBuiltinAgents } from "./utils"
 export type { AvailableAgent, AvailableCategory, AvailableSkill } from "./dynamic-agent-prompt-builder"
-export { createSisyphusAgent } from "./sisyphus"
+
+// Starlight - The Lumina-Nero Orchestration Engine (primary orchestrator)
+export { createStarlightAgent, createSisyphusAgent } from "./starlight"
+
+// Starlight-Apprentice - Focused executor (subagent)
+export {
+  createStarlightApprenticeAgentWithOverrides,
+  createSisyphusJuniorAgentWithOverrides,
+  STARLIGHT_APPRENTICE_DEFAULTS,
+  SISYPHUS_JUNIOR_DEFAULTS
+} from "./starlight-apprentice"
+
+// Oracle - Vision and architecture guidance
 export { createOracleAgent, ORACLE_PROMPT_METADATA } from "./oracle"
+
+// Research agents
 export { createLibrarianAgent, LIBRARIAN_PROMPT_METADATA } from "./librarian"
 export { createExploreAgent, EXPLORE_PROMPT_METADATA } from "./explore"
 
-
+// Specialized agents
 export { createMultimodalLookerAgent, MULTIMODAL_LOOKER_PROMPT_METADATA } from "./multimodal-looker"
 export { createMetisAgent, METIS_SYSTEM_PROMPT, metisPromptMetadata } from "./metis"
 export { createMomusAgent, MOMUS_SYSTEM_PROMPT, momusPromptMetadata } from "./momus"

src/agents/starlight-apprentice.ts

@@ -0,0 +1,115 @@
+import type { AgentConfig } from "@opencode-ai/sdk"
+import { isGptModel } from "./types"
+import type { AgentOverrideConfig } from "../config/schema"
+import {
+  createAgentToolRestrictions,
+  type PermissionValue,
+} from "../shared/permission-compat"
+
+const STARLIGHT_APPRENTICE_PROMPT = `<Role>
+Starlight-Apprentice - Focused executor from Arcanea Intelligence OS.
+Execute tasks directly with Guardian precision. NEVER delegate or spawn other agents.
+</Role>
+
+<Critical_Constraints>
+BLOCKED ACTIONS (will fail if attempted):
+- task tool: BLOCKED
+- delegate_task tool: BLOCKED
+
+ALLOWED: call_omo_agent - You CAN spawn explore/librarian agents for research.
+You work ALONE for implementation. No delegation of implementation tasks.
+</Critical_Constraints>
+
+<Todo_Discipline>
+TODO OBSESSION (NON-NEGOTIABLE):
+- 2+ steps → todowrite FIRST, atomic breakdown
+- Mark in_progress before starting (ONE at a time)
+- Mark completed IMMEDIATELY after each step
+- NEVER batch completions
+
+No todos on multi-step work = INCOMPLETE WORK.
+</Todo_Discipline>
+
+<Verification>
+Task NOT complete without:
+- lsp_diagnostics clean on changed files
+- Build passes (if applicable)
+- All todos marked completed
+</Verification>
+
+<Style>
+- Start immediately. No acknowledgments.
+- Match user's communication style.
+- Dense > verbose.
+</Style>`
+
+function buildStarlightApprenticePrompt(promptAppend?: string): string {
+  if (!promptAppend) return STARLIGHT_APPRENTICE_PROMPT
+  return STARLIGHT_APPRENTICE_PROMPT + "\n\n" + promptAppend
+}
+
+// Core tools that Starlight-Apprentice must NEVER have access to
+// Note: call_omo_agent is ALLOWED so subagents can spawn explore/librarian
+const BLOCKED_TOOLS = ["task", "delegate_task"]
+
+export const STARLIGHT_APPRENTICE_DEFAULTS = {
+  model: "anthropic/claude-sonnet-4-5",
+  temperature: 0.1,
+} as const
+
+// Backward compatibility alias
+export const SISYPHUS_JUNIOR_DEFAULTS = STARLIGHT_APPRENTICE_DEFAULTS
+
+export function createStarlightApprenticeAgentWithOverrides(
+  override: AgentOverrideConfig | undefined,
+  systemDefaultModel?: string
+): AgentConfig {
+  if (override?.disable) {
+    override = undefined
+  }
+
+  const model = override?.model ?? systemDefaultModel ?? STARLIGHT_APPRENTICE_DEFAULTS.model
+  const temperature = override?.temperature ?? STARLIGHT_APPRENTICE_DEFAULTS.temperature
+
+  const promptAppend = override?.prompt_append
+  const prompt = buildStarlightApprenticePrompt(promptAppend)
+
+  const baseRestrictions = createAgentToolRestrictions(BLOCKED_TOOLS)
+
+  const userPermission = (override?.permission ?? {}) as Record<string, PermissionValue>
+  const basePermission = baseRestrictions.permission
+  const merged: Record<string, PermissionValue> = { ...userPermission }
+  for (const tool of BLOCKED_TOOLS) {
+    merged[tool] = "deny"
+  }
+  merged.call_omo_agent = "allow"
+  const toolsConfig = { permission: { ...merged, ...basePermission } }
+
+  const base: AgentConfig = {
+    description: override?.description ??
+      "Starlight-Apprentice - Focused task executor from Arcanea Intelligence OS. Same Guardian discipline, no delegation.",
+    mode: "subagent" as const,
+    model,
+    temperature,
+    maxTokens: 64000,
+    prompt,
+    color: override?.color ?? "#78a6ff", // Cosmic Blue - Arcanea secondary color
+    ...toolsConfig,
+  }
+
+  if (override?.top_p !== undefined) {
+    base.top_p = override.top_p
+  }
+
+  if (isGptModel(model)) {
+    return { ...base, reasoningEffort: "medium" } as AgentConfig
+  }
+
+  return {
+    ...base,
+    thinking: { type: "enabled", budgetTokens: 32000 },
+  } as AgentConfig
+}
+
+// Backward compatibility alias
+export const createSisyphusJuniorAgentWithOverrides = createStarlightApprenticeAgentWithOverrides