M13.15: qa scenarios 1-4 (kinetic type, shape logo, compositing, tracking) and fixes

engine.batch + MCP batch tool; layer.newText/newShape name; prop.get evaluated
expression value; keys.select by path with errors; @uid paths; plain-JSON gradients;
addShapeItem/effect.apply return paths; unknown layers error; conform rescales
footage duration; render log name for [###]; render_frame transparent; clearer
mask errors; truncated groups in flat get_layer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/project/src/props.rs

@@ -307,6 +307,11 @@ pub enum Seg {
 
 /// Parse `transform/position`, `effects/#1/blurriness`, `effects/@57/blurriness`,
 /// `contents/rect#2/size`.
+/// `@57` (a whole path that is one uid).
+fn bare_uid(path: &str) -> Option<Uid> {
+    path.trim().strip_prefix('@')?.parse().ok()
+}
+
 pub fn parse_path(s: &str) -> Vec<Seg> {
     s.split(['/', '.'])
         .filter(|x| !x.is_empty())
@@ -365,10 +370,17 @@ impl PropGroup {
         let i = g.child_index(last)?;
         g.children.get_mut(i)
     }
+    /// A property by path; a bare `@uid` finds the property anywhere below this group.
     pub fn prop(&self, path: &str) -> Option<&Property> {
+        if let Some(u) = bare_uid(path) {
+            return self.find(u);
+        }
         self.node(path)?.as_prop()
     }
     pub fn prop_mut(&mut self, path: &str) -> Option<&mut Property> {
+        if let Some(u) = bare_uid(path) {
+            return self.find_mut(u);
+        }
         match self.node_mut(path)? {
             Node::Prop(p) => Some(p),
             _ => None,

crates/project/src/render_queue.rs

@@ -1277,10 +1277,12 @@ impl RenderLog {
 pub fn log_path(output: &str) -> String {
     let p = std::path::Path::new(output);
     let stem = p.file_stem().map(|s| s.to_string_lossy().to_string()).unwrap_or_default();
-    let mut stem: String = stem.replace("_[#####]", "").replace("[#####]", "");
+    let mut stem = stem;
     if let Some(i) = stem.find('#') {
+        // The run of `#`s, with its brackets when it has them (`[###]`, `[#####]`).
         let n = stem[i..].chars().take_while(|c| *c == '#').count();
-        stem.replace_range(i..i + n, "");
+        let (a, b) = if stem[..i].ends_with('[') && stem[i + n..].starts_with(']') { (i - 1, i + n + 1) } else { (i, i + n) };
+        stem.replace_range(a..b, "");
     }
     let stem = stem.trim_end_matches(['_', '.', ' ']);
     let name = format!("{}_RenderLog.txt", if stem.is_empty() { "Render" } else { stem });
@@ -1529,6 +1531,7 @@ mod tests {
         assert_eq!(log_path("/out/Main_[#####].png"), "/out/Main_RenderLog.txt");
         assert_eq!(log_path("/out/a.mov"), "/out/a_RenderLog.txt");
         assert_eq!(log_path("seq###.tif"), "seq_RenderLog.txt");
+        assert_eq!(log_path("gen/g_[###].png"), "gen/g_RenderLog.txt", "any bracketed run (M13.15)");
     }
 
     #[test]