COMET v0.4.0

Added

• Obsidian-compatible callouts with custom titles, fold states, nested content,
  and compact GitHub-inspired presentation in the Milkdown note surface.
• Obsidian-style typed Properties controls for text, lists, numbers,
  checkboxes, dates, date-times, tags, and property links, with COMET-styled
  type selection, inline list editing and removal, Vault tag suggestions, and
  Properties undo and redo shortcuts.

Changed

• Replaced the Atomic／full-page CodeMirror note surface with Milkdown Crepe
  components for one shared reading and editing document.
• Isolated Codex host integration and Node.js runtime adapters into
  @comet/codex and @comet/runtime, keeping the MCP, Core, Task, Graph, and
  Markdown packages host-neutral.
• Unified active Milkdown editing controls with COMET interface typography and
  sizing, and added Callout to Crepe's existing slash menu.
• Unified Vault metadata, Graph links, Task metadata, and link integrity on the
  @comet/markdown remark AST projection and Obsidian wikilink extension.

Fixed

• Fixed Milkdown code block copy actions in MCP Apps hosts that reject iframe
  Clipboard API access, and aligned the Copy button with COMET control tokens.

Removed

• Removed the legacy markdown-it renderer, Obsidian renderer plugins, and
  duplicate regex-based Markdown link parser.