test(pi): no-prompt branch with --model emits --provider ollama (no -p)

[hggz]

test(pi): no-prompt branch with --model emits --provider ollama (no -p)

What

Covers the prompt === null arm of PiAdapter.buildCommand — i.e. interactive pi with -m and no -p:

if (prompt !== null) {
  return ["pi", "-p", prompt, ...providerArgs, ...modelArgs];
}
return ["pi", ...providerArgs, ...modelArgs];   // <-- this branch

Currently only the prompt+model arm is asserted by the existing test renamed in #16. This PR adds coverage for the no-prompt arm.

Why

That branch is only reachable when process.stdin.isTTY === true, so a plain spawnSync test cannot hit it (subprocess stdin is never a TTY). To exercise it, the new test allocates a pty via util-linux script:

spawnSync("script", ["-qfec", `node ${CLI} -m <model>`, "/dev/null"], …)

…then strips CR characters from the output and parses the DOCKER_INVOKED line as usual. The test self-skips if command -v script is unavailable (it is preinstalled on ubuntu-latest).

The test asserts:

• exit code 0
• pi argv contains no stray -p
• pi argv tail is exactly pi --provider ollama --model <model>

How verified

$ pnpm install --frozen-lockfile && pnpm build && pnpm test:e2e:cli
…
✔ pi: --model is forwarded with --provider ollama in local mode
✔ pi: interactive (no -p, no piped stdin) with --model emits 'pi --provider ollama --model X' (no -p)
…
ℹ tests 20
ℹ pass  20
ℹ fail  0

[capotej]

needs a rebase