Conversione references in skill condivisa agency-shared-references

- Creata nuova skill agency-shared-references con 24 references centralizzate
- Spostate tutte le references da cartelle sparse (references/, agency-web-developer/, agency-archivist/) in un'unica posizione
- Aggiornati tutti i symlink delle 14 skills per puntare a ../agency-shared-references/references
- Aggiornati tutti i riferimenti nei SKILL.md (percorsi coerenti)
- README.md aggiornato con nuova struttura e istruzioni generiche
- INSTALL.sh semplificato con istruzioni platform-agnostic
- Eliminata cartella references/ dal root (ora centralizzata)
- Struttura più pulita e mantenibile, facile da installare su qualsiasi piattaforma

agency-strategy/SKILL.md

@@ -179,11 +179,11 @@ perché **specializzati in clarity-first e conversioni**.
 
 ## References
 
-- [strategy_playbook.md](../../references/strategy_playbook.md) — Framework positioning
-- [copy_frameworks.md](../../references/copy_frameworks.md) — Framework copy
-- [content_formats.md](../../references/content_formats.md) — Formati content
-- [audience_personas.md](../../references/audience_personas.md) — Template personas
-- [brand_voice.md](../../references/brand_voice.md) — Tone of voice
+- [strategy_playbook.md](../agency-shared-references/references/strategy_playbook.md) — Framework positioning
+- [copy_frameworks.md](../agency-shared-references/references/copy_frameworks.md) — Framework copy
+- [content_formats.md](../agency-shared-references/references/content_formats.md) — Formati content
+- [audience_personas.md](../agency-shared-references/references/audience_personas.md) — Template personas
+- [brand_voice.md](../agency-shared-references/references/brand_voice.md) — Tone of voice
 
 ---
 

agency-strategy/references

@@ -1 +1 @@
-../references
+../agency-shared-references/references