feat(commands): add /replicate command

Entry point for paper replication workflow.

.opencode/commands/replicate.md

@@ -0,0 +1,37 @@
+---
+description: Start paper replication workflow
+agent: paper-director
+---
+
+Start the paper replication workflow for the specified paper.
+
+## Input
+
+Paper file: $ARGUMENTS
+
+If no file specified, ask the user to provide the path to a paper (Markdown file or paste text directly).
+
+## Workflow
+
+1. Validate paper file exists (if path provided)
+2. Extract paper name from filename or ask user
+3. Create workspace directory: `workspace/{paper_name}/`
+4. Begin Phase 1: Paper Analysis
+   - Dispatch @paper-image-extractor
+   - Dispatch @paper-analyzer
+5. Present Human Checkpoint with analysis summary
+6. After approval, begin Phase 2: Code Generation (TDD)
+7. Begin Phase 3: Verification
+8. Present final replication report
+
+## Example Usage
+
+```
+/replicate workspace/attention_is_all_you_need.md
+```
+
+Or without arguments:
+```
+/replicate
+> Please provide the path to your paper or paste the content directly.
+```