feat: add uipath-integrations skill for SaaS tool connections

[1aifanatic]

Summary

• Adds a new skills/uipath-integrations/ skill teaching AI agents how to connect UiPath automations to popular SaaS tools
• Covers Slack (Incoming Webhooks + Bot API), Airtable (REST API v0 — list/create records), Notion (REST API v1 — query/create pages), HubSpot (CRM contacts/deals via REST API v3), and Zapier (inbound webhook trigger pattern)
• Includes generic REST API patterns using HttpClient, credential management best practices using Orchestrator assets, and webhook input argument handling
• Common pitfalls table (rate limits, 401 errors, JSON serialization, Zapier configuration)

Motivation

Solopreneurs and small teams frequently need to connect UiPath automations to the SaaS tools they already use. The existing skills cover UiPath's own Integration Service connectors (Jira, Salesforce) but there's no guidance for direct API integrations with the lightweight tools most solopreneurs rely on.

Test plan

• Verify SKILL.md frontmatter follows existing skill format (name, description with TRIGGER/DO NOT TRIGGER, metadata.allowed-tools)
• Verify code examples compile (C# patterns match existing coded-workflows skill conventions)
• Verify uip resources assets CLI commands match current CLI syntax
• Verify cross-references to other skills use correct relative paths