docs: clarify fork head and test env setup

docs/ghostty-fork.md

@@ -71,7 +71,16 @@ section 3 copy-mode commit, even though the section 4 resize commits were applie
   - Emits one `OSC 133;A` fresh-prompt mark for real prompt transitions.
   - Uses `OSC 133;P` markers for prompt redraws so async zsh themes do not look like extra prompt lines.
 
-The fork branch HEAD is now the section 5 zsh redraw commit.
+### 6) zsh Pure-style multiline prompt redraws
+
+- Commit: `0cf559581` (zsh: fix Pure-style multiline prompt redraws)
+- Files:
+  - `src/shell-integration/zsh/ghostty-integration`
+- Summary:
+  - Handles multiline prompts that use `\n%{\r%}` to return to column 0 before the visible prompt line.
+  - Places the continuation marker after Pure's hidden carriage return so async redraws do not leave stale preprompt lines behind.
+
+The fork branch HEAD is now the section 6 zsh redraw commit.
 
 ## Upstreamed fork changes
 
@@ -93,6 +102,7 @@ These files change frequently upstream; be careful when rebasing the fork:
 
 - `src/shell-integration/zsh/ghostty-integration`
   - Prompt marker handling is easy to regress when upstream adjusts zsh redraw behavior. Keep the
-    `OSC 133;A` vs `OSC 133;P` split intact for redraw-heavy themes.
+    `OSC 133;A` vs `OSC 133;P` split intact for redraw-heavy themes, and preserve the special
+    handling for Pure-style `\n%{\r%}` prompt newlines.
 
 If you resolve a conflict, update this doc with what changed.

tests/test_ghostty_zsh_pure_preprompt_redraw.py

@@ -99,7 +99,8 @@ def _capture_session(*, use_ghostty: bool, wrapper_dir: Path, resources_dir: Pat
         env = dict(os.environ)
         env["HOME"] = str(home)
         env["TERM"] = "xterm-256color"
-        env["PATH"] = "/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
+        env.pop("GHOSTTY_SHELL_FEATURES", None)
+        env.pop("GHOSTTY_BIN_DIR", None)
         if use_ghostty:
             env["ZDOTDIR"] = str(wrapper_dir)
             env["GHOSTTY_ZSH_ZDOTDIR"] = str(home)