Update Builder CLI from fusion to builder binary

[steve8708]

Summary

Updates all references to the Builder.io CLI from the old fusion executable and @builder.io/fusion npm package to the new builder binary installed via a curl script.

Problem

The Builder.io agent-native CLI was rebranded and redistributed under a new name and installation method. The old executable name (fusion) and install command (npx --yes @builder.io/fusion) were no longer valid, causing broken onboarding instructions and incorrect defaults throughout the codebase.

Solution

Performed a consistent find-and-replace across all user-facing and internal references — defaults, docs, registry entries, CLI arg handling, and UI install instructions — replacing fusion with builder and swapping the npm-based install for the new curl-based installer.

Key Changes

• AgentPanel.tsx – Updated CLI_DEFAULT constant from "fusion" to "builder"
• AgentTerminal.tsx – Updated JSDoc default reference from 'fusion' to 'builder'
• cli-registry.ts – Renamed registry key from fusion to builder; cleared installPackage (no longer an npm package)
• terminal-plugin.ts – Updated all fallback command defaults from "fusion" to "builder"
• docs.harnesses.tsx – Updated the Builder.io row in the harness comparison table to use builder as the command
• harnesses.ts – Updated fusionConfig to use command: "builder", cleared installPackage, and added installCommand: "curl -fsSL https://www.builder.io/install.sh | bash"
• config.ts – Added optional installCommand field to HarnessConfig interface to support non-npm install flows
• App.tsx – Updated install UI to render installCommand when present, falling back to the npx --yes {installPackage} pattern
• utils.ts – Updated CLI args switch-case from "fusion" to "builder"

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You can tag me at @BuilderIO for anything you want me to fix or change

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[builder-io-integration]

Builder has reviewed your changes and found 1 potential issue.

Review Details

PR #91 Review: Builder CLI Rename (fusion → builder)

This PR performs a consistent rename of the Builder.io CLI identifier from fusion to builder across 9 files, and switches the install method from npx --yes @builder.io/fusion to a curl-based installer. The approach is sound and the changes are internally consistent.

Risk: Standard — While the code changes are low-complexity, the rename introduces a localStorage migration gap that causes a confirmed broken state for existing users.

Key Findings

🟡 MEDIUM — localStorage not migrated (confirmed by 2/2 agents)
Existing users who had previously selected Builder.io (stored as "fusion" under agent-native-cli-command) will load the new code and immediately hit a broken terminal: the PTY server rejects "fusion" as unrecognized since it was removed from CLI_REGISTRY, sending a WebSocket "not-found" error and closing the connection.

What Looks Good

• ✅ installPackage: "" is safe — both the PTY server and harness server guard with if (registry?.installPackage), so no npx --yes trailing-empty-string is ever executed
• ✅ App.tsx correctly uses config.installCommand || \npx --yes ${config.installPackage}`` — the curl command renders for Builder.io
• ✅ The terminal-plugin.ts status-endpoint fallback ("claude" → "builder") was a pre-existing inconsistency that is now correctly fixed
• ✅ buildCliArgs switch-case updated correctly; no other CLI-specific branches missed

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View in Builder.io

_{Code review by Builder.io}

[builder-io-integration]

🟡 Missing localStorage migration for "fusion" → "builder"

Existing users with "fusion" saved under agent-native-cli-command will get a broken terminal on next load: the PTY server rejects "fusion" (removed from CLI_REGISTRY) and closes the WebSocket with a "not-found" error. Add a one-time migration: if (saved === "fusion") { localStorage.setItem(CLI_STORAGE_KEY, "builder"); return "builder"; }

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