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_polish.yml

@@ -3,12 +3,17 @@ description: >
   Iris polishes the chapter using the editorial consensus from the review roundtable.
 debug: true
 model: power
+system: agent_prompt
 
 skills:
   - guides/YAFictionGuide.md
   - guides/RomanceFictionGuide.md
   - guides/SciFiFictionGuide.md
 
+agent_prompt:
+  - "= identity.md"
+  - "agent.rag.json"
+
 sections:
   - agent
   - project
@@ -43,6 +48,7 @@ steps:
       Preserve everything the editors marked as STRENGTHS.
       Do not add new plot elements not already present.
       Match the genre tone and audience level throughout.
+      Output ONLY the fully rewritten chapter text.
 
   - type: document
     filename: "{{task_name_slug}}-polished"