refactor(tui): remove skill digest/setup leftovers (dead-code audit 2026-08-03, P1)

package_is_path_safe, bundled_skill_body_sha256, and
uninstall_system_skills had no callers. compute_package_digest and
install_system_skills remain part of the current install/audit flow; the
two uninstall-only tests are removed with the dead API.

crates/tui/src/skills/mod.rs

@@ -24,11 +24,11 @@ pub use roots::{
     CompatibleHarness, SkillRootAccess, SkillRootCatalog, SkillRootDescriptor, SkillRootId,
     SkillRootKind, SkillScope, classify_configured_skills_dir, safe_display_path,
 };
+#[allow(unused_imports)]
+pub use system::is_exact_bundled_skill;
 pub use system::{
     BundledSkillTier, bundled_skill_tier, install_system_skills, is_bundled_skill_name,
 };
-#[allow(unused_imports)]
-pub use system::{bundled_skill_body_sha256, is_exact_bundled_skill};
 
 use std::fs;
 use std::path::{Path, PathBuf};

crates/tui/src/skills/package_digest.rs

@@ -71,12 +71,6 @@ pub fn compute_package_digest(package_dir: &Path) -> Result<String, PackageDiges
     Ok(hex_digest(hasher.finalize()))
 }
 
-/// Whether the package tree is safe (no symlink / escape / cycle) under limits.
-#[allow(dead_code)] // used by future import/validation paths
-pub fn package_is_path_safe(package_dir: &Path) -> bool {
-    compute_package_digest(package_dir).is_ok()
-}
-
 fn walk(
     dir: &Path,
     package_root: &Path,

crates/tui/src/skills/system.rs

@@ -345,22 +345,6 @@ pub fn is_exact_bundled_skill(name: &str, skill_md_content: &str) -> bool {
         .any(|s| s.name == name && s.body == skill_md_content)
 }
 
-/// SHA-256 (hex) of the shipped `SKILL.md` body for a bundled skill, if any.
-#[must_use]
-#[allow(dead_code)] // available for managers / docs that prefer digest over body compare
-pub fn bundled_skill_body_sha256(name: &str) -> Option<String> {
-    use sha2::{Digest, Sha256};
-    BUNDLED_SKILLS.iter().find(|s| s.name == name).map(|s| {
-        let digest = Sha256::digest(s.body.as_bytes());
-        let mut out = String::with_capacity(digest.len() * 2);
-        for byte in digest {
-            use std::fmt::Write as _;
-            let _ = write!(&mut out, "{byte:02x}");
-        }
-        out
-    })
-}
-
 /// Attempt to install a single bundled skill into `skills_dir`.
 ///
 /// Returns `true` if installation occurred (fresh install or version bump).
@@ -492,24 +476,5 @@ fn write_marker_atomically(marker: &Path, version: &str) -> std::io::Result<()>
     fs::rename(temporary.path(), marker)
 }
 
-/// Remove all system skills and the version marker.
-///
-/// Intended for tests and `deepseek setup --clean`.  Ignores missing files.
-#[allow(dead_code)]
-pub fn uninstall_system_skills(skills_dir: &Path) -> std::io::Result<()> {
-    let marker = skills_dir.join(".system-installed-version");
-
-    for skill in BUNDLED_SKILLS {
-        let dir = skills_dir.join(skill.name);
-        if dir.exists() {
-            fs::remove_dir_all(&dir)?;
-        }
-    }
-    if marker.exists() {
-        fs::remove_file(&marker)?;
-    }
-    Ok(())
-}
-
 #[cfg(test)]
 mod tests;

crates/tui/src/skills/system/tests.rs

@@ -394,30 +394,8 @@ fn version_bump_respects_deleted_existing_skill_while_adding_new_skill() {
     assert_eq!(ver.trim(), BUNDLED_SKILL_VERSION);
 }
 
-// ── uninstall ─────────────────────────────────────────────────────────────
+// ── upgrade ───────────────────────────────────────────────────────────────
 
-#[test]
-fn uninstall_removes_bundled_skills_and_marker() {
-    let tmp = TempDir::new().unwrap();
-    install_system_skills(tmp.path()).unwrap();
-    uninstall_system_skills(tmp.path()).unwrap();
-
-    for skill in BUNDLED_SKILLS {
-        assert!(
-            !skill_file(&tmp, skill.name).exists(),
-            "{} should be removed",
-            skill.name
-        );
-    }
-    assert!(!marker_file(&tmp).exists(), "marker should be removed");
-}
-
-#[test]
-fn uninstall_on_clean_dir_is_a_noop() {
-    let tmp = TempDir::new().unwrap();
-    // Must not panic or error.
-    uninstall_system_skills(tmp.path()).unwrap();
-}
 #[test]
 fn upgrade_from_v4_installs_pack_and_retires_unchanged_v4_best_practices() {
     let tmp = TempDir::new().unwrap();