feat: add interactive VT and workspace command plane

docs/BRAND.md

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+# Lumbridge brand mark
+
+## Concept
+
+Lumbridge's symbol is an original ember-flame wrapped around a bridge arch. The
+diagonal negative space also reads as a terminal chevron or an open gateway.
+Together, those shapes express a fast native workspace where engineers cross
+between terminals, tools, hosts, and agents.
+
+The mark is symbol-only. Do not ship a Unicode fire emoji as the application
+icon, add pseudo-medieval ornament, or attach generated lettering to the mark.
+
+## Color
+
+| Role | Hex | Intended surface |
+| --- | --- | --- |
+| Ember | `#FF6B35` | Canonical application icon and neutral contexts |
+| Ember, light UI | `#D94824` | Light surfaces around `#F6F3EE` |
+| Ember, dark UI | `#FF8A5B` | Dark surfaces around `#0B0F14` |
+
+All files have transparent backgrounds. The surface colors above are usage
+guidance and are not baked into the assets. Do not add gradients, drop shadows,
+outlines, or extra flame colors.
+
+## Assets
+
+The 1024 px master is
+`assets/brand/master/lumbridge-mark-master-1024.png`. Use it as the source for
+new platform exports.
+
+- `assets/brand/app-icons/lumbridge-app-{size}.png` contains the canonical Ember
+  icon at 16, 32, 48, 64, 128, 256, 512, and 1024 px.
+- `assets/brand/light/lumbridge-mark-light-{size}.png` contains the light-UI
+  colorway at the same sizes.
+- `assets/brand/dark/lumbridge-mark-dark-{size}.png` contains the dark-UI
+  colorway at the same sizes.
+
+The existing PNGs are RGBA and square. Packaging may derive platform-native
+containers such as macOS `.icns` later, but those derived files should preserve
+the supplied canvas and must not stretch or crop the symbol.
+
+## Placement
+
+- Preserve the mark's aspect ratio and transparent canvas.
+- Outside an application-icon tile, keep clear space equal to at least one
+  eighth of the rendered mark height on every side.
+- Prefer the prepared export nearest the requested display size. Do not scale a
+  16 px export upward.
+- At 16–24 px, use the canonical app-icon export without a wordmark, badge, or
+  status dot. The flame and gateway are the intended small-size reading; the
+  terminal chevron becomes secondary.
+- Do not place detailed artwork or low-contrast orange immediately behind the
+  transparent mark.
+
+## Generation and production record
+
+The concept was generated once with the built-in `image_gen` mode using this
+prompt:
+
+> Use case: logo-brand. Asset type: native desktop application icon master for
+> Lumbridge, a very high-performance Rust terminal multiplexer and AI-agent
+> workspace. Create one original symbol-only brand mark that expresses
+> firemaking energy, a bridge or gateway, and a terminal prompt through a single
+> strong silhouette. Use a compact upright ember-flame whose interior negative
+> space forms a clean bridge arch or open gateway; incorporate one extremely
+> subtle angular terminal chevron idea into the geometry without adding a
+> separate floating glyph. Use a vector-friendly, flat, minimal geometric mark
+> with precise edges, centered on a square transparent canvas. Use warm ember
+> orange. Exactly one symbol; no text, letters, wordmark, emoji glyph, gradient,
+> shadow, 3D, mockup, border tile, or watermark. Avoid RuneScape imagery or
+> style, game trademarks, medieval crests, literal campfires, logs, swords,
+> shields, runes, detailed sparks, characters, mascots, and decorative
+> flourishes.
+
+The selected output's geometry was retained. Production exports were then made
+deterministically: low-alpha detached pixels were removed, the mark was inset
+onto a 1024 px transparent canvas, its generated shading was replaced with the
+three exact flat colors above, and Lanczos downscales were produced. No
+third-party artwork, typeface, or game asset is included.
+
+## Originality and release constraints
+
+This identity deliberately uses only generic fire, bridge, gateway, and terminal
+ideas. Do not adapt or add artwork, interfaces, names, symbols, screenshots, or
+other assets from RuneScape or another game.
+
+Generation and internal review are not a trademark search or legal clearance.
+Before a public release, perform a similarity search for the symbol and obtain
+product-name/trademark review; the original mark does not by itself clear the
+name `Lumbridge`. Keep the prompt and this production record with the assets for
+provenance, and review the image-generation provider's then-current output terms
+before redistribution.