Set up Slack server for community

[skokaina]

Why

GitHub Issues is for bugs, not conversations. Early adopters need a real-time channel to ask "how do I do X" without opening an issue. This is where your first 10 contributors come from. Without it, potential contributors bounce.

Channels to create

Channel	Purpose
`#general`	Announcements and general discussion
`#help`	"How do I..." questions
`#show-and-tell`	Users sharing agents they built with AgentSpec
`#contributing`	Discussion for code contributors
`#bugs`	Quick triage before opening GitHub issues

Setup tasks

• Create Discord server with AgentSpec branding (logo already at `logo/agentspec_full.png`)
• Create channels listed above
• Set up a welcome message explaining what AgentSpec is and linking to docs
• Add invite link to README.md (badge format: ``)
• Add invite link to CONTRIBUTING.md
• Add invite link to docs homepage (`docs/index.md`)

[iliassjabali]

PR #41 addresses the three invite-link checklist items (README, CONTRIBUTING, docs/index.md). Remaining items (branding, channel creation, welcome message / Workflow Builder onboarding) are Slack-UI-only and tracked separately.