Rebrand Phase 5: Update GitHub workflows and scripts

[JustAGhosT]

Context

NexaMesh rebrand — CI/CD and deployment scripts.

GitHub Workflows

• .github/workflows/release-desktop.yml — bundle naming
• .github/workflows/deploy-azure-functions.yml — Azure Function app naming, CORS
• .github/workflows/ml-training.yml — project tagging
• .github/workflows/deploy-infrastructure.yml — resource group naming

Scripts

• scripts/setup-branching-strategy.sh
• scripts/setup-cosmos-containers.sh
• scripts/diagnose-azure-functions.sh
• scripts/Get-AzureSecrets.ps1
• scripts/Setup-CosmosContainers.ps1

GitHub Docs

• .github/AZURE_SETUP.md
• .github/AZURE_TROUBLESHOOTING.md
• .github/DEPLOYMENT_SEQUENCE.md
• .github/VALIDATION_SUMMARY.md
• .github/WORKFLOW_IMPROVEMENTS.md
• .github/copilot-instructions.md
• .github/instructions/marketing.md

Verification

• All workflow YAML is valid
• CI passes on branch

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