host: the core owns the event loop; every platform becomes a vtable of optional methods

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diff --git a/src/CHANGELOG.md b/src/CHANGELOG.md
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+# Changelog
+
+## 0.0.1
+
+- Version tracking: the compiled version is embedded from build.zig.zon and shown by Changelog.
+- New builtins: Changelog, Newtty, and Joincol.
+- Markdown tree-sitter highlighting, including nested fenced code blocks.
+- `.patch` and `.diff` files are highlighted.
+- Coloring dispatch keys off the buffer title.
+- Opening a new file only splits into a new column when both panes would be at least 100 columns wide.
+- Terminal ANSI colors render only in tty mode; normal mode is a plain editing
+  view, so an edit can never shift a shell row's colour.
+- `New` and `Newcol` open an empty scratch buffer instead of a shell or a
+  temporary file. Its directory is inherited from the pane it was opened from.
+- `Save` on a scratch asks for a path, prefilled with that inherited
+  directory, and the buffer becomes an ordinary file once written.
+- `Save` on a terminal writes its plaintext scrollback to a prompted path and
+  leaves the pane a terminal.
+- A dropped pane's memory outlives its frame, so a pane pointer taken during
+  that frame stays valid until the next one repairs it.
+- The core owns the event loop. Each platform is now a `Host` of optional
+  function pointers; an unimplemented method falls back to an in-process
+  default, so a host with no methods at all is still a complete pardes.
+- Ctrl-V and Ctrl-Shift-V paste in a tty pane: the default register and the
+  system clipboard, typed at the program the way a terminal emulator pastes
+  (bracketed under mode 2004). A paste arriving from the desktop reaches the
+  shell instead of an edit buffer the pty cannot see.
+- The default filesystem is pardes's own source, embedded from an allowlist
+  (src/source_manifest.zig): what a host with no file method reads, and what
+  the browser has always read. It replaced a build-time generator that embedded
+  every tracked .zig file.
+- `zig build run-isolated` builds and runs `pardes-isolate`: the same source
+  with one comptime option, whose host supplies only the terminal. The
+  filesystem is not disabled in it, it is absent — the libc paths compile away.