feat(plugin): publish Relight Studio

[superche]

Summary

• publish Relight Studio 0.1.1 as a static convax.plugin/3 Web workflow Plugin
• discover installed image model tools through generation.tools.list and invoke the shared generation.canvas.execute path with a direct incoming Canvas image
• request the host-owned create-pending-node result mode so Canvas feedback appears immediately and the same node is replaced on success
• drain Plugin node-state persistence before generation and suppress tail saves while generation is active
• provide lighting presets, draggable key-light positioning, WebGL preview, model selection, and generated-node status
• implement both selects and all eight lighting sliders with Radix UI Select and Slider, bundled locally with React into the static Plugin package

Architecture

Relight-specific UI and workflow code belongs in convax-plugins, while Convax remains provider-neutral. This Plugin does not bundle a provider, model, credential flow, or companion executable. It selects only installed kind: model image tools that accept reference_image; installed Tool Plugins remain the complete generation boundary.

The native controls remain hidden state mirrors for the established imperative workflow, while Radix owns the interactive and accessible control surface. The build emits a self-contained local ESM bundle with no remote URL or bare runtime import.

Dependencies and merge order

• requires microvoid/convax#23 for the generic Canvas pending-resource lifecycle and the Desktop generation adapter
• requires fix(xiaoyunque): register reference image assets #19 for XiaoYunque reference-image registration when upload_file does not return a Pippit asset id
• this PR intentionally remains draft; after fix(xiaoyunque): register reference image assets #19 merges, it must rebase on main and advance its Registry sequence beyond 23

Validation

• rebased onto current origin/main (542be60)
• bun run check passed outside the restricted loopback sandbox
• XiaoYunque shared tool tests: 106 passed
• repository tooling tests: 57 passed, including 5 Relight-specific package tests
• strict root lockfile, typecheck, static Plugin validation, companion builds, deterministic packing, and Registry/index builds passed
• packed artifact: convax-plugin-relight-studio-0.1.1.zip (373009 bytes)
• real browser validation: Radix Select/Slider exposed one semantic control each, keyboard interaction changed the lighting value, and the console remained at 0 errors / 0 warnings

No live or billable generation call was triggered during validation.