feat(note): add initial Vix Note foundation

Author: GaspardKirira

CHANGELOG.md

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+# Changelog
+
+All notable changes to Vix Note will be documented in this file.
+
+The format follows a simple versioned changelog style.
+
+## v0.1.0
+
+### Added
+
+- Added the initial Vix Note module foundation.
+- Added the public umbrella header:
+  - `include/vix/note/note.hpp`
+
+- Added module version metadata:
+  - `include/vix/note/Version.hpp`
+
+- Added core note error support:
+  - `NoteError`
+  - `NoteErrorCode`
+
+- Added core result and output models:
+  - `NoteResult`
+  - `NoteResultStatus`
+  - `NoteOutput`
+  - `NoteOutputKind`
+
+- Added the note cell model:
+  - markdown cells
+  - Reply cells
+  - C++ cells
+  - HTML cells
+  - cell ids
+  - cell titles
+  - execution counts
+  - cell outputs
+
+- Added the note document model:
+  - document id
+  - document title
+  - document path
+  - ordered cell storage
+  - execution counter
+  - cell insertion
+  - cell removal
+  - cell lookup by index or id
+
+- Added the markdown-compatible `.vixnote` parser.
+- Added parser options for:
+  - automatic cell id assignment
+  - title inference from the first markdown heading
+
+- Added `.vixnote` storage support:
+  - load from disk
+  - save to disk
+  - atomic write option
+  - parent directory creation
+  - serialization back to markdown-compatible text
+
+- Added C++ cell execution through `vix run`.
+- Added runtime session support:
+  - mutable document state
+  - execution records
+  - output application
+  - execution count tracking
+
+- Added the high-level note kernel:
+  - run one cell
+  - run all cells
+  - run executable cells only
+  - stop on first failure option
+  - non-executable skipped-cell option
+
+- Added embedded web asset support:
+  - default index HTML
+  - default CSS
+  - default JavaScript
+  - asset lookup
+  - asset content type detection
+
+- Added local UI route resolver:
+  - static asset routes
+  - `/api/document`
+  - `/api/cells/<index>/run`
+  - `/api/run-all`
+
+- Added local server facade:
+  - server lifecycle state
+  - start
+  - stop
+  - restart
+  - local URL generation
+  - route forwarding
+
+- Added static HTML exporter:
+  - standalone HTML export
+  - fragment export
+  - markdown rendering
+  - code cell rendering
+  - HTML cell rendering
+  - output rendering
+  - custom CSS option
+
+- Added browser UI assets:
+  - `assets/index.html`
+  - `assets/css/note.css`
+  - `assets/js/note.js`
+
+- Added example note documents:
+  - `examples/hello.vixnote`
+  - `examples/learning_cpp.vixnote`
+  - `examples/vix_ui_note.vixnote`
+
+- Added CMake build configuration.
+- Added CMake test configuration.
+- Added CMake example file copying configuration.
+- Added README documentation.
+- Added roadmap documentation.
+
+### Design
+
+- Established Vix Note as a UI-first notebook foundation.
+- Clarified that Vix Note is not a replacement for `vix repl`.
+- Kept C++ cell execution aligned with normal Vix CLI behavior by delegating to `vix run`.
+- Kept the first server layer backend-independent through `NoteRoutes` and `NoteServer`.
+- Kept `.vixnote` files readable as markdown-compatible documents.
+
+### Current Limitations
+
+- Reply cells are recognized but not fully executed yet.
+- `NoteServer` is currently a lifecycle and routing facade, not a concrete socket-binding HTTP server.
+- The browser UI is static and prepared for later API integration.
+- Markdown rendering in the HTML exporter supports only a small dependency-free subset.
+- C++ cell execution currently depends on the `vix` command being available.
+
+### Planned Next
+
+- Connect `NoteServer` to the real Vix HTTP server layer.
+- Add a CLI command such as `vix note <file.vixnote>`.
+- Load real `.vixnote` documents into the browser UI.
+- Connect browser actions to note API routes.
+- Add real Reply cell execution through Vix Reply.
+- Improve compiler and runtime error display.
+- Improve HTML export rendering.