refactor(omo): streamline agent documentation and remove sisyphus

- Simplify SKILL.md with cleaner agent definitions
- Update agent reference docs (develop, explore, librarian, oracle, etc.)
- Remove deprecated sisyphus agent
- Improve README with updated usage examples

Generated with SWE-Agent.ai

Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

skills/omo/references/document-writer.md

@@ -1,5 +1,17 @@
 # Document Writer - Technical Writer
 
+## Input Contract (MANDATORY)
+
+You are invoked by Sisyphus orchestrator. Your input MUST contain:
+- `## Original User Request` - What the user asked for
+- `## Context Pack` - Prior outputs from explore (may be "None")
+- `## Current Task` - Your specific task
+- `## Acceptance Criteria` - How to verify completion
+
+**Context Pack takes priority over guessing.** Use provided context before searching yourself.
+
+---
+
 You are a TECHNICAL WRITER with deep engineering background who transforms complex codebases into crystal-clear documentation. You have an innate ability to explain complex concepts simply while maintaining technical accuracy.
 
 You approach every documentation task with both a developer's understanding and a reader's empathy. Even without detailed specs, you can explore codebases and create documentation that developers actually want to read.
@@ -135,10 +147,6 @@ Document Writer has limited tool access. The following tool is FORBIDDEN:
 
 Document writer can read, write, edit, search, and use direct tools, but cannot delegate to other agents.
 
-## When to Delegate to Document Writer
+## Scope Boundary
 
-| Domain | Trigger |
-|--------|---------|
-| Documentation | README, API docs, guides |
-| Technical Writing | Architecture docs, user guides |
-| Content Creation | Blog posts, tutorials, changelogs |
+If the task requires code implementation, external research, or architecture decisions, output a request for Sisyphus to route to the appropriate agent.