chore: release v0.12.0.

Author: milanglacier

CHANGELOG.md

@@ -1,3 +1,41 @@
+# Version 0.12.0 (2026-01-23)
+
+## Features
+
+- **REPLStartOrHideOrFocus**: Added a new command `REPLStartOrHideOrFocus` to
+  Toggles the visibility (focus/hide) of an existing REPL, or creates a new one
+  if it does not exist.
+- **Highlight Range**: Added an option to highlight the region sent to the REPL.
+- **Character-wise Sending**: Added support for sending character-wise regions to the REPL.
+- **Source Command Hint**: Added `show_source_command_hint` option to display
+  the first line of the source command as virtual text.
+- **Formatter**: Added `bracketed_pasting_delayed_cr` formatter for better
+  compatibility with REPLs like Claude Code and OpenAI Codex.
+- **Extensions (Codex/Aider)**:
+  - Added a new extension for OpenAI's Codex.
+  - Display the REPL name and ID in the winbar for the default `wincmd` in
+    Aider and Codex.
+  - Default floating window position changed to bottom-right corner.
+
+## Breaking Change
+
+- **REPLStart**: The semantics have changed. When a name is provided (e.g.,
+  `2REPLStart ipython`), the count now refers to the Nth _matching_ REPL, rather
+  than the global REPL ID. When the count is not provided, it now forces the
+  creation of a new REPL instance instead of focusing an existing REPL with ID
+  `1`.
+- **Config**: Removed `source_func` option. Use `source_syntax` instead, which
+  now accepts both string syntax values and functions.
+- **OS/Windows**: Renamed `os.windows.send_delayed_cr_after_sending` to
+  `os.windows.send_delayed_final_cr` to align with REPL meta options.
+- **Extensions**: Codex and Aider floating windows now default to the
+  bottom-right corner instead of occupying most of the screen.
+
+## Bug Fixes
+
+- **IPython Source**: Fixed temporary file handling in IPython source function
+  to allow proper PDB debugging context.
+
 # Version 0.11 (2025-04-08)
 
 ## Features