chore: add per-package README and CHANGELOG for pub.dev

pub.dev requires README.md and CHANGELOG.md in each package directory.
Added minimal but accurate files to all four packages.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

packages/cli/CHANGELOG.md

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+# Changelog
+
+## 1.0.0 — 2026-04-25
+
+Initial stable release.
+
+- `dew init` — initialise a Dew project
+- `dew kanban` — full kanban board management (16 subcommands + TUI)
+- `dew mcp serve` — start the MCP server for AI assistant integration

packages/cli/README.md

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+# dew
+
+A git-native, file-based project management CLI with a kanban board and MCP server.
+
+See the [full documentation](https://github.com/artificery-dev/dew#readme) for installation, quick-start, and all available commands.
+
+## Installation
+
+```sh
+dart pub global activate dew
+```
+
+## License
+
+MIT — see [LICENSE](LICENSE).

packages/core/CHANGELOG.md

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+# Changelog
+
+## 1.0.0 — 2026-04-25
+
+Initial stable release.
+
+- `DewCommand` base class with arg-parser-driven CLI and MCP tool dual-mode
+- `DewToolCommand` mixin for commands that expose an MCP tool
+- `CommandRegistry` for feature-package command registration
+- `ProjectContext` for locating and loading `.project/dew.yaml`
+- `schemaFromArgParser` helper for generating JSON Schema from `ArgParser`

packages/core/README.md

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+# dew_core
+
+Core abstractions for the [Dew](https://github.com/artificery-dev/dew) project management tool.
+
+Provides `DewCommand`, `DewToolCommand`, `CommandRegistry`, and `ProjectContext` — the building blocks used by every Dew feature package.
+
+## Usage
+
+This package is an internal dependency of `dew_kanban`, `dew_mcp`, and `dew`. It is not intended for direct use outside the Dew ecosystem.
+
+## License
+
+MIT — see [LICENSE](LICENSE).

packages/kanban/CHANGELOG.md

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+# Changelog
+
+## 1.0.0 — 2026-04-25
+
+Initial stable release.
+
+- 16 kanban CLI subcommands: `create`, `list`, `move`, `get`, `update`, `delete`, `archive`, `unarchive`, `link`, `unlink`, `comment`, `search`, `board`, `stats`, `config`, `tui`
+- Interactive TUI with board view, ticket detail, inline editor, and help overlay
+- Full MCP tool definitions for all commands
+- Git-native file-based storage (Markdown + YAML frontmatter)
+- Configurable columns, ticket types, labels, milestones, and transitions

packages/kanban/README.md

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+# dew_kanban
+
+Kanban board feature package for the [Dew](https://github.com/artificery-dev/dew) project management tool.
+
+Provides all kanban CLI commands (`create`, `list`, `move`, `get`, `update`, `delete`, `archive`, `unarchive`, `link`, `unlink`, `comment`, `search`, `board`, `stats`, `config`, `tui`) plus the interactive terminal UI and MCP tool definitions.
+
+## Usage
+
+This package is consumed by the `dew` CLI and `dew_mcp` packages. See the [main README](https://github.com/artificery-dev/dew#readme) for full documentation.
+
+## License
+
+MIT — see [LICENSE](LICENSE).

packages/mcp/CHANGELOG.md

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+# Changelog
+
+## 1.0.0 — 2026-04-25
+
+Initial stable release.
+
+- `DewMcpServer` stdio MCP server exposing all kanban tools
+- 15 MCP tools covering the full kanban lifecycle
+- `dew mcp serve` command for connecting AI assistant clients

packages/mcp/README.md

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+# dew_mcp
+
+MCP (Model Context Protocol) server package for the [Dew](https://github.com/artificery-dev/dew) project management tool.
+
+Exposes all Dew kanban operations as MCP tools so AI assistants (GitHub Copilot, Claude, etc.) can manage your kanban board directly.
+
+## Usage
+
+```sh
+dew mcp serve
+```
+
+Connect your MCP client to the process via stdio. See the [main README](https://github.com/artificery-dev/dew#readme) for full setup instructions.
+
+## License
+
+MIT — see [LICENSE](LICENSE).