sync from monorepo @ 5408ddc3

crates/dirigent_fermata/src/core/project.rs

@@ -1,12 +1,14 @@
 use std::path::{Path, PathBuf};
 
-/// Markers checked in priority order when walking up from a target path.
-const MARKERS: &[&str] = &["botignore.toml", ".botignore", ".git"];
+/// Strong markers that definitively identify a project root.
+const STRONG_MARKERS: &[&str] = &["botignore.toml", ".botignore.toml", ".git"];
 
 /// Walk upward from `target` (or its parent if `target` is a file) looking
-/// for the nearest project root. Roots are identified by the presence of
-/// any marker in `MARKERS`. Walks from the **target file's location**, not
-/// from cwd, because agents `cd` around.
+/// for the nearest project root. Strong markers (`botignore.toml`,
+/// `.botignore.toml`, `.git`) stop the walk immediately. A `.botignore`
+/// file is remembered as a fallback but does not stop the walk — the search
+/// continues upward for a stronger boundary. If none is found, the
+/// `.botignore` location is used.
 pub fn find_project_root(target: &Path) -> Option<PathBuf> {
     let start = if target.is_file() {
         target.parent()?
@@ -14,14 +16,18 @@ pub fn find_project_root(target: &Path) -> Option<PathBuf> {
         target
     };
 
+    let mut fallback: Option<PathBuf> = None;
     let mut current = Some(start);
     while let Some(dir) = current {
-        for marker in MARKERS {
+        for marker in STRONG_MARKERS {
             if dir.join(marker).exists() {
                 return Some(dir.to_path_buf());
             }
         }
+        if fallback.is_none() && dir.join(".botignore").exists() {
+            fallback = Some(dir.to_path_buf());
+        }
         current = dir.parent();
     }
-    None
+    fallback
 }