fix(ingest): CanonicalizeLinks strips wing:/wiki/ prefix and repairs path-style links (#87)

plainLinkRE matches any [[...]] without a pipe, including path-prefixed
forms like [[wing:homelab/failures/foo]] or [[wiki/agentsquad/decisions/bar]]
that the LLM extraction step occasionally emits. Title-lookup against
titleToSlug always fails for these (they're paths, not titles), so they
were silently left broken.

Before falling to the unknown-wikilink warning, strip a known wing:/wiki/
root prefix and emit the clean wing/hall/slug path directly — matching
the brain-graph path-style link convention.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Roq1ajWKR5f1hG5Df9wC6A

ingestion/internal/pipeline/links.go

@@ -51,6 +51,21 @@ func buildTitleMap(pages []wiki.Page, inventory map[wiki.PageType][]wiki.Entry)
 	return m
 }
 
+// pathStylePrefixes are known root prefixes the LLM extraction step
+// sometimes bakes into a wikilink target instead of emitting a clean
+// wing/hall/slug path (or bare title). Stripping them repairs the link
+// in place — see hyperguild#87.
+var pathStylePrefixes = []string{"wing:", "wiki/"}
+
+func stripPathStylePrefix(displayName string) (string, bool) {
+	for _, prefix := range pathStylePrefixes {
+		if stripped, ok := strings.CutPrefix(displayName, prefix); ok {
+			return stripped, true
+		}
+	}
+	return displayName, false
+}
+
 func canonicalizeContent(content string, titleToSlug map[string]string) (string, []string) {
 	var warnings []string
 	result := plainLinkRE.ReplaceAllStringFunc(content, func(match string) string {
@@ -59,12 +74,17 @@ func canonicalizeContent(content string, titleToSlug map[string]string) (string,
 			return match
 		}
 		displayName := sub[1]
-		slug, ok := titleToSlug[strings.ToLower(displayName)]
-		if !ok {
-			warnings = append(warnings, fmt.Sprintf("unknown wikilink: [[%s]]", displayName))
-			return match
+
+		if slug, ok := titleToSlug[strings.ToLower(displayName)]; ok {
+			return "[[" + slug + "|" + displayName + "]]"
 		}
-		return "[[" + slug + "|" + displayName + "]]"
+
+		if stripped, hadPrefix := stripPathStylePrefix(displayName); hadPrefix {
+			return "[[" + stripped + "]]"
+		}
+
+		warnings = append(warnings, fmt.Sprintf("unknown wikilink: [[%s]]", displayName))
+		return match
 	})
 	return result, warnings
 }