Add Murmure — community intelligence for AI devtools

[murmurecc]

https://murmure.cc/

checklist

Please make sure you've complied with the contribution guidelines :

• The homepage clearly states that the product is for developers.
  → Oui, Murmure est conçu spécifiquement pour les équipes qui construisent des AI devtools.

• "Headless", "API-First", "SaaS" are frequently used keywords.
  → Oui (SaaS API-first avec webhooks).

• The product is available now and requires payment.
  → Oui, disponible en production avec plans payants.

• The product reached a significant milestone...
  → Oui.

• The PR has a descriptive title.
  → Oui.

• The new submission isn't a duplicate.
  → Oui.

• The entry has a description, is sorted alphabetically, and ends with a full stop.
  → Oui.

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Entry ajoutée dans la section Analytics :

• Murmure - Community intelligence and 48h sentiment reports for AI devtool teams.