Annotate skill doc reads with skill names (#16813)

Addresses #16303

Problem: Skill doc reads render as plain `Read SKILL.md`, so the TUI
hides which skill was opened.

Solution: Best-effort annotate exact `SKILL.md` reads with the matching
loaded skill name from `skills_all` before rendering exec cells.

Before:
```
• Explored
  └ Read SKILL.md
```

After:
```
• Explored
  └ Read SKILL.md (pr-babysitter skill)
```

codex-rs/tui/src/chatwidget/skills.rs

@@ -19,6 +19,7 @@ use codex_core::skills::model::SkillDependencies;
 use codex_core::skills::model::SkillInterface;
 use codex_core::skills::model::SkillMetadata;
 use codex_core::skills::model::SkillToolDependency;
+use codex_protocol::parse_command::ParsedCommand;
 use codex_protocol::protocol::ListSkillsResponseEvent;
 use codex_protocol::protocol::SkillMetadata as ProtocolSkillMetadata;
 use codex_protocol::protocol::SkillsListEntry;
@@ -142,6 +143,31 @@ impl ChatWidget {
         self.skills_all = skills;
         self.set_skills(Some(enabled_skills_for_mentions(&self.skills_all)));
     }
+
+    pub(crate) fn annotate_skill_reads_in_parsed_cmd(
+        &self,
+        mut parsed_cmd: Vec<ParsedCommand>,
+    ) -> Vec<ParsedCommand> {
+        if self.skills_all.is_empty() {
+            return parsed_cmd;
+        }
+
+        for parsed in &mut parsed_cmd {
+            let ParsedCommand::Read { name, path, .. } = parsed else {
+                continue;
+            };
+            if name != "SKILL.md" {
+                continue;
+            }
+
+            // Best effort only: annotate exact SKILL.md path matches from the loaded skills list.
+            if let Some(skill) = self.skills_all.iter().find(|skill| skill.path == *path) {
+                *name = format!("{name} ({} skill)", skill.name);
+            }
+        }
+
+        parsed_cmd
+    }
 }
 
 fn skills_for_cwd(cwd: &Path, skills_entries: &[SkillsListEntry]) -> Vec<ProtocolSkillMetadata> {