fix(wiki): resolve Algorithm directory case-insensitively (#1273)

Verified bug in our 5.1.0 wiki.ts:44 — still uses join(PAI_DIR, "Algorithm") while doctrine + actual directory is ALGORITHM. Applying equivalent fix to our source.

Author: imrathion

Releases/v5.0.0/.claude/PAI/PULSE/modules/wiki.ts

@@ -41,7 +41,40 @@ const DOCUMENTATION_DIR = join(PAI_DIR, "DOCUMENTATION")
 const KNOWLEDGE_DIR = join(PAI_DIR, "MEMORY", "KNOWLEDGE")
 const BOOKMARKS_DIR = join(PAI_DIR, "MEMORY", "BOOKMARKS")
 const BOOKMARKS_CSV = join(BOOKMARKS_DIR, "bookmarks.csv")
-const ALGORITHM_DIR = join(PAI_DIR, "Algorithm")
+// Resolve the Algorithm directory case-insensitively. The v6.3.0 doctrine uses
+// `ALGORITHM/` (all-caps) while older defaults used `Algorithm/` — on Linux
+// (case-sensitive FS), a string-equality mismatch silently empties the Wiki's
+// Algorithm view. Scan PAI_DIR once at module init.
+function resolveAlgorithmDir(paiDir: string): string | null {
+  if (!existsSync(paiDir)) return null
+  const entries = readdirSync(paiDir, { withFileTypes: true })
+  const exact = entries.find(
+    (e) => e.name === "Algorithm" && (e.isDirectory() || e.isSymbolicLink()),
+  )
+  if (exact) return join(paiDir, exact.name)
+  const variants = entries.filter(
+    (e) =>
+      e.name.toLowerCase() === "algorithm" &&
+      (e.isDirectory() || e.isSymbolicLink()),
+  )
+  if (variants.length > 0) {
+    // Deterministic tie-break: prefer `ALGORITHM` (v6.3.0 doctrine spelling),
+    // else raw byte-order (locale-independent, stable across Node versions).
+    // readdirSync order is FS-implementation-defined; never trust it.
+    variants.sort((a, b) => {
+      if (a.name === "ALGORITHM") return -1
+      if (b.name === "ALGORITHM") return 1
+      return a.name < b.name ? -1 : a.name > b.name ? 1 : 0
+    })
+    return join(paiDir, variants[0].name)
+  }
+  console.warn(
+    `[wiki] PAI Algorithm directory not found in ${paiDir} — Algorithm view will be empty`,
+  )
+  return null
+}
+
+const ALGORITHM_DIR: string | null = resolveAlgorithmDir(PAI_DIR)
 const SKILLS_DIR = join(HOME, ".claude", "skills")
 const HOOKS_DIR = join(HOME, ".claude", "hooks")
 const SETTINGS_PATH = join(HOME, ".claude", "settings.json")
@@ -177,7 +210,7 @@ function systemDocMetadata(filePath: string): { slug: string; group: string } |
     return { slug: `${group}__${bareSlug}`, group }
   }
 
-  if (filePath.startsWith(ALGORITHM_DIR)) {
+  if (ALGORITHM_DIR != null && filePath.startsWith(ALGORITHM_DIR)) {
     const filename = basename(filePath)
     return {
       slug: `Algorithm__${stripMarkdownExtension(filename)}`,
@@ -528,7 +561,7 @@ function indexSystemDocs(): void {
     indexSystemDoc(filePath)
   }
 
-  if (!existsSync(ALGORITHM_DIR)) return
+  if (ALGORITHM_DIR == null || !existsSync(ALGORITHM_DIR)) return
 
   try {
     const algorithmFiles = readdirSync(ALGORITHM_DIR, { withFileTypes: true })