feat: CliKit — a terminal UI layer for the CLI on @alchemy.run/sigil

[BlankParticle]

Bottom of stack #1236: feat/clikit → feat/profile → feat/cli-overhaul.

This PR introduces CliKit, the shared terminal UI service used by the two PRs above for prompts, progress, semantic output, and full-screen applications. It is built on @alchemy.run/sigil, our renderer fork.

What lands here

• One scoped CliKit service, provided once at the CLI root.
• A lazily imported SigilRuntime, so non-interactive commands do not eagerly load React or the renderer.
• Typed non-interactive and cancellation failures instead of hanging on unavailable input.
• Serialized prompt sessions, interruption-safe live views, and one renderer root per output stream.
• Prompt primitives for text, secrets, confirmation, selection, menus, browser authorization, and custom screens.
• Scope-owned progress, task, transcript, application, and alternate-screen lifecycles.
• Theme-aware layout, typography, feedback, data, and interactive components with Unicode/ASCII fallbacks.
• Sigil-owned stdio capture so logs and direct output remain ordered around active live regions.
• Capability detection for TTY input, color, Unicode, size, alternate screen, and --no-input.

The implementation and public terminology consistently use Sigil: SigilRuntime, Sigil component aliases, loader names, comments, and tests. The obsolete Ink patch is removed later in the stack when the legacy renderer is deleted.

Stack boundary

• feat!: profiles overhaul #1234 consumes CliKit for profiles and authentication.
• feat!: overhaul the Alchemy CLI #1235 moves every remaining CLI surface onto CliKit, deletes the legacy renderer and Clack, and introduces the final SigilCli root view.

The focused CliKit suite exercises real rendering through fake streams, including ordering, resize behavior, prompts, cancellation, interruption, renderer failures, full-screen sessions, and teardown.

[alchemy-version-bot]

Install the packages built from this commit:

Alchemy

alchemy

bun add https://pkg.ing/alchemy/a895bcc

@alchemy.run/better-auth

bun add https://pkg.ing/@alchemy.run/better-auth/a895bcc

@alchemy.run/cloudflare-runtime

bun add https://pkg.ing/@alchemy.run/cloudflare-runtime/a895bcc

@alchemy.run/frontend-frameworks

bun add https://pkg.ing/@alchemy.run/frontend-frameworks/a895bcc

@alchemy.run/node-utils

bun add https://pkg.ing/@alchemy.run/node-utils/a895bcc

@alchemy.run/pr-package

bun add https://pkg.ing/@alchemy.run/pr-package/a895bcc

@alchemy.run/floci

bun add https://pkg.ing/@alchemy.run/floci/a895bcc

Distilled

@distilled.cloud/core

bun add https://pkg.ing/@distilled.cloud/core/cb11c5b

@distilled.cloud/aws

bun add https://pkg.ing/@distilled.cloud/aws/cb11c5b

@distilled.cloud/axiom

bun add https://pkg.ing/@distilled.cloud/axiom/cb11c5b

@distilled.cloud/cloudflare

bun add https://pkg.ing/@distilled.cloud/cloudflare/cb11c5b

@distilled.cloud/hetzner

bun add https://pkg.ing/@distilled.cloud/hetzner/cb11c5b

@distilled.cloud/neon

bun add https://pkg.ing/@distilled.cloud/neon/cb11c5b

@distilled.cloud/planetscale

bun add https://pkg.ing/@distilled.cloud/planetscale/cb11c5b