feat: Spider UI/UX level-up

[DeanoC]

Summary

• CLI decomposed: 4,500-line main.zig monolith → focused modules under src/cli/commands/ (agent, auth, chat, complete, fs, node, session, workspace) and src/cli/wizards/
• CLI additions: interactive REPL, TUI primitives, formatted output layer, venom service discovery, shell completions (bash/zsh/fish), client-side health checks (workspace doctor), plan-based workspace operations shared between CLI and GUI
• GUI state extracted: pure domain types in src/gui/state/ (mission_types, venom_types, mission_helpers) with 34 unit tests wired into the build system
• GUI App struct refactored: ~200+ fields grouped into typed domain sub-structs (MissionState, TerminalState, DebugState, ChatState, FilesystemState, WorkspaceState)
• GUI panels extracted: self-contained panel draw logic moved to src/gui/panel_hosts/ using anytype duck-typing to prevent circular imports; root.zig reduced by ~1,200 lines
• Theme added: zsc_modern_ai theme pack with desktop/phone/tablet/fullscreen layout profiles, component styles, and dark/light token variants

Test plan

• zig build — clean, no errors
• zig build test --summary all — 34/34 tests pass across 5 executables
• spider --help shows all commands
• spider workspace list connects and lists workspaces
• spider workspace doctor runs health checks
• GUI launches and all extracted panels render (Dashboard, Venoms, Node Topology, MCP, Mission Workboard)
• Theme zsc_modern_ai loads in settings without errors

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