refactor: move all project folders into projects/ subdirectory

This change reorganizes the repository structure to keep the root directory
clean. All 15 project folders are now nested under projects/, alongside
infrastructure directories (agents/, templates/, deliverables/, rag/, skills/).

This allows the repository to grow without polluting the core service directories.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/chapter_roundtable.yml

@@ -5,6 +5,10 @@ description: >
   The output is a consensus critique (or documented disagreement) for the polish step.
 
 debug: true
+system: agent_prompt
+
+agent_prompt:
+  - "= identity.md"
 
 skills:
   - guides/YAFictionGuide.md