Fix OVMF 4m variant detection and Gentoo dep atom parsing

1. host.ovmf: Arch edk2-ovmf 202508+ uses OVMF_CODE.4m.fd (4MB variant)
   instead of OVMF_CODE.fd. Added .4m.fd paths to the search list and
   updated the find fallback to match OVMF_CODE*.fd glob.

2. test_parse_dep_atoms: The single-regex approach with lazy quantifiers
   failed on atoms like "sys-libs/zlib" at end-of-string. Rewrote
   parse_dep_atoms to split on whitespace first, strip [:slot] and [USE]
   suffixes, then match category/name with a simple anchored regex.
   This is more robust and easier to reason about.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/dpack/src/converter/gentoo.rs

@@ -321,21 +321,49 @@ fn parse_use_flags(iuse: &str) -> HashMap<String, OptionalDep> {
 /// Strips category prefixes and version constraints for dpack format.
 fn parse_dep_atoms(deps: &str, warnings: &mut ConversionWarnings) -> Vec<String> {
     let mut result = Vec::new();
+    // Regex to extract category/name from a single Gentoo atom token
+    // Strips: leading operator (>=, <=, ~, =), trailing version (-1.2.3),
+    //         slot (:0=), and USE flags ([foo,bar])
     let atom_re = Regex::new(
-        r"(?:>=|<=|~|=)?([a-zA-Z0-9_-]+/[a-zA-Z0-9_.+-]+?)(?:-\d[^\s\[\]:]*)?(?:\[.*?\])?(?::[\w/=*]*)?(?:\s|$)"
+        r"^(?:>=|<=|~|=)?([a-zA-Z0-9_-]+/[a-zA-Z0-9_+-]+[a-zA-Z])"
     ).unwrap();
 
-    for caps in atom_re.captures_iter(deps) {
+    // Process each whitespace-separated token, skipping non-atoms
+    for token in deps.split_whitespace() {
+        let clean = token.trim();
+
+        // Skip conditional operators and parens
+        if clean.is_empty()
+            || clean.ends_with('?')
+            || clean == "("
+            || clean == ")"
+            || clean == "||"
+            || clean == "^^"
+        {
+            continue;
+        }
+
+        // Strip trailing [:slot] and [USE] before regex matching
+        let without_use = if let Some(bracket_pos) = clean.find('[') {
+            &clean[..bracket_pos]
+        } else {
+            clean
+        };
+        let without_slot = if let Some(colon_pos) = without_use.find(':') {
+            &without_use[..colon_pos]
+        } else {
+            without_use
+        };
+
+        if let Some(caps) = atom_re.captures(without_slot) {
             if let Some(m) = caps.get(1) {
                 let full_atom = m.as_str();
-            // Strip category prefix (e.g., "dev-libs/" -> "")
                 let pkg_name = full_atom
                     .rsplit('/')
                     .next()
                     .unwrap_or(full_atom)
                     .to_string();
 
-            // Skip virtual packages and test-only deps
                 if full_atom.starts_with("virtual/") {
                     continue;
                 }
@@ -345,6 +373,7 @@ fn parse_dep_atoms(deps: &str, warnings: &mut ConversionWarnings) -> Vec<String>
                 }
             }
         }
+    }
 
     // Detect complex constructs we can't fully parse
     if deps.contains("^^") || deps.contains("||") {

tests/proxmox/run-in-vm.sh

@@ -133,11 +133,14 @@ else
     record "host.nested_virt" "skip" "No VMX/SVM — QEMU boot tests will be slower"
 fi
 
-# Check OVMF — Arch uses split CODE/VARS files, others use a single OVMF.fd
+# Check OVMF — search all known paths including 4m variant (newer Arch)
 OVMF=""
 for p in \
+    /usr/share/edk2/x64/OVMF_CODE.4m.fd \
     /usr/share/edk2/x64/OVMF_CODE.fd \
+    /usr/share/edk2-ovmf/x64/OVMF_CODE.4m.fd \
     /usr/share/edk2-ovmf/x64/OVMF_CODE.fd \
+    /usr/share/OVMF/OVMF_CODE.4m.fd \
     /usr/share/OVMF/OVMF_CODE.fd \
     /usr/share/edk2/x64/OVMF.fd \
     /usr/share/edk2-ovmf/x64/OVMF.fd \
@@ -148,7 +151,7 @@ for p in \
 done
 # Last resort: find it
 if [ -z "$OVMF" ]; then
-    OVMF=$(find /usr/share -name "OVMF_CODE.fd" -o -name "OVMF.fd" 2>/dev/null | head -1)
+    OVMF=$(find /usr/share -name "OVMF_CODE*.fd" -o -name "OVMF.fd" 2>/dev/null | head -1)
 fi
 [ -n "$OVMF" ] && record "host.ovmf" "pass" "$OVMF" || record "host.ovmf" "fail" "Not found — install edk2-ovmf"