feat(ingest): Implement wikilink-based deduplication for index entries

skills/ingest/scripts/index-append.py

@@ -18,6 +18,7 @@ import re
 import sys
 
 ENTRY_RE = re.compile(r"^- \[\[")
+LINK_RE = re.compile(r"^- \[\[([^\]]+)\]\]")
 HEADER_RE = re.compile(r"^## ")
 
 
@@ -71,11 +72,31 @@ def main() -> int:
     intro = [ln for ln in body if not ENTRY_RE.match(ln)]
     entries = [ln for ln in body if ENTRY_RE.match(ln)]
 
-    if args.entry in entries:
-        print(f"index-append: entry already present, skipping")
-        return 0
+    # Deduplicate by wikilink PATH, not by exact line: a re-ingest with a changed
+    # summary/maturity should UPDATE the existing entry, not add a duplicate line.
+    new_m = LINK_RE.match(args.entry)
+    new_link = new_m.group(1) if new_m else None
+
+    if new_link is not None:
+        replaced = False
+        for idx, ln in enumerate(entries):
+            m = LINK_RE.match(ln)
+            if m and m.group(1) == new_link:
+                if ln == args.entry:
+                    print("index-append: entry already present, skipping")
+                    return 0
+                entries[idx] = args.entry          # same page, refreshed text
+                replaced = True
+                break
+        if not replaced:
+            entries.append(args.entry)
+    else:
+        # No parseable wikilink — fall back to exact-line dedup.
+        if args.entry in entries:
+            print("index-append: entry already present, skipping")
+            return 0
+        entries.append(args.entry)
 
-    entries.append(args.entry)
     entries.sort(key=str.casefold)
 
     # Normalise intro: drop trailing blanks, keep header + comment(s)