Add intentic (self-hosted parallel agent workspace)

[radarsu]

Adds intentic to Harnesses & orchestration → Session managers & parallel runners, placed by star count
(3, between iris at 5 and Agent CLI Menu at 2).

Inclusion requirements

• CLI or terminal interface — ships an ic CLI (prebuilt binaries for macOS, Linux and Windows in every
  release) that provisions and drives sandboxes, and each sandbox runs real terminals over PTY; the agents it
  runs are the terminal-native ones (Claude Code, Codex, OpenCode, Gemini CLI over ACP).
• Reads/writes code and runs commands autonomously — agents work in a real checkout in their own git
  worktree, run builds and tests in their container, and propose changes as diffs.
• Valid, active project — released continuously, MIT, TypeScript.

Why it's interesting for this section: isolation is per agent rather than per thread — a container plus a
git worktree each, so ten parallel runs never see each other's tree — and the sandbox image is an editable
Dockerfile the user approves rather than a fixed environment. Runs continue when you disconnect, and the same
fleet reopens from any browser or a phone.

Disclosure: I maintain intentic.