Add Oh My Pi ACP (built-in)

[jiwangyihao]

Adds the built-in ACP server mode for Oh My Pi.

Distribution:

• npm/npx: @oh-my-pi/pi-coding-agent@15.9.0 with acp

Authentication:

• ACP initialize advertises the built-in agent auth method, which satisfies Registry auth validation.
• The built-in ACP path also supports terminal auth when the client advertises ACP terminal auth capability.

Local validation performed:

• SKIP_URL_VALIDATION=1 uv run --with jsonschema .github/workflows/build_registry.py --dry-run passed and included omp-acp v15.9.0.
• Manual auth handshake against npx --prefix <tmp> --yes @oh-my-pi/pi-coding-agent@15.9.0 acp returned agentInfo: oh-my-pi v15.9.0 and authMethods: [{ id: "agent" }].

Notes:

• This entry now points at the upstream Oh My Pi package instead of the standalone omp-acp adapter package.
• Host-native verify_agents.py --auth-check --agent omp-acp --type npx on Windows/MSYS still uses bare npx, which is a local host quirk; GitHub Actions runs the registry checks on ubuntu-latest.

[gabrielmoreira]

@jiwangyihao omp has built-in ACP support: https://omp.sh/docs/acp

[jiwangyihao]

@jiwangyihao omp has built-in ACP support: https://omp.sh/docs/acp

I recently discovered this (OMP has built-in ACP support, though I found some blocking-related issues during testing) and submitted some fixes to the OMP repository via PRs. Those PRs have now been merged. After the next OMP release is published and tested, I will update this PR to use OMP’s built-in ACP support.