Spectra v0.6.0

Published packages

@mohanscodex/spectra-ai, @mohanscodex/spectra-agent, and @mohanscodex/spectra-app remain the unified core SDK packages.
@mohanscodex/spectra-code is the terminal TUI app built on the core packages with OpenTUI. The archived @mohanscodex/spectra-tui package is not part of the release train.

Added file content blocks with filename, path, MIME, size, and data fields so prompts can carry local file attachments through provider serialization.
Expanded built-in provider coverage for OpenAI-compatible cloud providers, coding-plan endpoints, and local runtimes including Ollama, LM Studio, llama.cpp, vLLM, and SGLang.
Added OAuth/device-login support for Kimi Code and OpenAI Codex style coding providers.
Added provider usage recording and reporting, including live usage fetches for supported coding plans and cache-aware token accounting.
Refreshed generated model metadata for newer provider models.

Added the runSubagent primitive for bounded child-agent execution with model overrides, budgets, event forwarding, abort propagation, and error reporting.
Improved steering and follow-up queue semantics so queued messages drain reliably during active streams without duplicate submissions.
Surfaced loop-end reasons and kept loop warnings in UI status/toasts instead of injecting them into tool messages.
Added structured task reporting for background and foreground subagent work.

Added layer-2 orchestration that wires AgentRegistry delegation through runSubagent.
Improved session provenance and parity behavior across session stores.
Kept the fixed-version core package release unified across ai, agent, app, and the code app.

Added multi-agent collaboration with foreground subagents, background task mode, child-session navigation, and subagent status rendering.
Added local file attachments: @ fuzzy file autocomplete, MIME detection, file visuals, prompt badges, transcript persistence, and provider handoff.
Added the phased todo tool and /todo command with inline hierarchical rendering, validation errors, import/export/edit/copy flows, and command palette integration.
Added memory tool rendering with scope-aware theming and skipped unnecessary permission prompts for non-file utility tools.
Added prompt-anchored autocomplete for slash command arguments and file paths, plus command/menu selection-window refinements.
Added shell timing metadata, timeout footers, syntax highlighting parser registration, source-aware code block styles, and improved file-icon/color visuals.
Improved provider, skills, memory, usage, cost, settings, update, doctor, and modal dialog polish.
Moved steering message display to render immediately and fixed duplicated or delayed steering submissions.
Fixed child-session filtering, subagent view layout, bottom navigation controls, tool status icons, shell metadata display, edit diff spacing, inline tool titles, and redundant icons.

Updated release automation to delete package-scoped tags/releases, create or update one unified vX.Y.Z GitHub release, and trigger platform binary builds for that unified tag.
Expanded published-package smoke testing to include @mohanscodex/spectra-code alongside the core packages.
Fixed Windows binary packaging by dynamically generating WiX components, installing WiX v4 through the dotnet toolchain, and correcting variable usage.
Updated READMEs to reflect the current core package split, OpenTUI-based Spectra Code app, feature matrix, providers, attachments, todos, and release packaging.