Add Pixir agent

[ranvier2d2]

Summary

Adds Pixir to the ACP Registry.

Pixir is an OTP-native, local-first coding-agent harness with ACP over stdio. It is distributed through the published npx package @ranvier-technologies/pixir-acp@0.1.3, which launches the Pixir ACP server.

• ID: pixir
• Version: 0.1.3
• Distribution: npx @ranvier-technologies/pixir-acp@0.1.3
• Website: https://pixir.dev
• Auth: initialize advertises pixir-login with type: "terminal"
• Icon: 16x16 monochrome SVG using currentColor

Validation

Ran locally from the registry repo root:

pnpm view @ranvier-technologies/pixir-acp version dist-tags --json
git diff --check upstream/main...HEAD
uv run --with jsonschema .github/workflows/build_registry.py --dry-run
uv run python .github/workflows/verify_agents.py --agent pixir --type npx --auth-check --verbose

Results:

• Published npx package exists and latest is 0.1.3.
• Diff whitespace check passed.
• Registry dry-run validated 39 agents successfully and included pixir v0.1.3.
• Pixir auth check passed with Auth OK: pixir-login(terminal).