Files
devin auth login with stdio "inherit" when it finds no Devin sign-in, and the program read magpie's next requests from the host's stdin as its answer ("Login canceled") while writing over its answers; host.js now gives every program started through Bun.spawn and Bun.spawnSync (all of node:child_process goes through them) nothing to read and stderr to write. pi-zcode asks its region with onSelect and options { id, label }, pi's own shape, and checks the id ("bigmodel"); pi.js answered with the label, so the login said "Login cancelled". Packages read their sign-in back from pi's auth.json (readStoredCredential: pi-zcode for its plans, pi-cursor for its token, pi-provider-qoder through the registry, pi-antigravity syncs its accounts through it) and register what they find on session_start (pi-zcode its plans' models, pi-devin-plus and pi-xai-oauth refresh their catalogs), and a provider registered after loading went into a queue nothing read. Now each package is bound with pi's ExtensionRunner as pi's session binds it (bindCore: no UI, tools or session of magpie's), so a later registerProvider reaches the runtime; each pi provider's first account is kept in $PI_CODING_AGENT_DIR/auth.json as pi keeps it, written when it changes; and a provider newly signed in, and each one signed in when the host starts, is sent session_start, after which magpie lists its models again if they changed. A runner that can't be made leaves the packages registered as before. TestPiPackage now has a select answered with an id, a login that starts a program on the terminal, and a session_start that reads the sign-in from pi's auth.json and adds a model; it fails on the old code (the label answered; the model never listed, auth.json empty) and passes. With real accounts in a sandbox HOME: pi-zcode signed in through Z.ai and lists 11 models (none before); its requests reach ZCode but the account's Start Plan answers 200 {"code":1005,"msg":"exceed quota limit"}, which pi-zcode reads as an empty answer (its bug). pi-provider-qoder signed in through Google, 16 models, tool round trips on Kimi-K3 and Efficient. pi-devin-plus signed in, its catalog refreshed on session_start (53 models), tool round trips on swe-2 and claude-opus-5.5; pi-xai-oauth (grok-4.7) and pi-antigravity (gemini-3.8-flash) tool round trips; @rahularya01/pi-cursor answers text (its agent doesn't call a client's tools, upstream). pi-provider-kiro wasn't signed in: it needs pi's terminal, a Builder ID or an IdC login. go vet, builds (darwin, GOOS=linux -tags nogui, GOOS=windows) pass.
usage: WorkBuddy's credits are said beside their share — on the Routing page, the Usage page and the menu bar, used or left as the share is (#659)