fix: issue-triage quick wins (extraction, MCP probes, gitignore, CJK, impact) (#654)

Batch of small, localized fixes from an open-issue triage:

- .codegraph/.gitignore now ignores everything but itself, so the database,
  daemon.pid, sockets, and logs stop showing up in git status (#492, #484)
- MCP server answers resources/list and prompts/list with empty lists instead
  of -32601, clearing scary log lines in opencode/Codex (#621)
- index SAP HANA .xsjs/.xsjslib as JavaScript (#556) and TS .mts/.cts (#366)
- visit anonymous AMD/CommonJS/IIFE wrapper bodies so their inner functions and
  calls are indexed instead of coming up empty (#528)
- batch the changed-file lookup so a huge first sync no longer hits
  "too many SQL variables" (#540)
- list files with `git ls-files -z` so non-ASCII/CJK paths survive
  core.quotepath and are no longer silently skipped (#541)
- attach Go methods on generic receivers (*T[P]) to their type (#583, RC1)
- impact no longer climbs the structural `contains` edge, so a leaf symbol
  stops dragging in its sibling methods (#536)
- README: explicit `codegraph install` step, run in a new shell (#631)

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/extraction/grammars.ts

@@ -46,9 +46,15 @@ const WASM_GRAMMAR_FILES: Record<GrammarLanguage, string> = {
 export const EXTENSION_MAP: Record<string, Language> = {
   '.ts': 'typescript',
   '.tsx': 'tsx',
+  // ESM/CJS TypeScript module extensions — parsed as TS (no JSX). (#366)
+  '.mts': 'typescript',
+  '.cts': 'typescript',
   '.js': 'javascript',
   '.mjs': 'javascript',
   '.cjs': 'javascript',
+  // SAP HANA XS Classic server-side JavaScript. (#556)
+  '.xsjs': 'javascript',
+  '.xsjslib': 'javascript',
   '.jsx': 'jsx',
   '.py': 'python',
   '.pyw': 'python',

src/extraction/index.ts

@@ -198,32 +198,32 @@ function collectGitFiles(repoDir: string, prefix: string, files: Set<string>): v
   // Without this, monorepos using submodules index 0 files. (See issue #147.)
   // Note: --recurse-submodules only supports -c/--cached and --stage modes — it
   // can't be combined with -o, so untracked files are gathered separately below.
-  const tracked = execFileSync('git', ['ls-files', '-c', '--recurse-submodules'], gitOpts);
-  for (const line of tracked.split('\n')) {
-    const trimmed = line.trim();
-    if (trimmed) {
-      files.add(normalizePath(prefix + trimmed));
-    }
+  // -z gives NUL-separated, unquoted output so non-ASCII (e.g. CJK) paths
+  // survive verbatim. Without it git octal-escapes and double-quotes such paths
+  // (the core.quotepath default), and the quoted form never matches a real file
+  // on disk → those files are silently dropped from the index. (#541)
+  const tracked = execFileSync('git', ['ls-files', '-z', '-c', '--recurse-submodules'], gitOpts);
+  for (const rel of tracked.split('\0')) {
+    if (rel) files.add(normalizePath(prefix + rel));
   }
 
   // Untracked files (submodules manage their own untracked state). Embedded git
   // repos surface here as a single "subdir/" entry that git refuses to descend
   // into — recurse into those as their own repos so their source gets indexed.
-  const untracked = execFileSync('git', ['ls-files', '-o', '--exclude-standard'], gitOpts);
-  for (const line of untracked.split('\n')) {
-    const trimmed = line.trim();
-    if (!trimmed) continue;
-    if (trimmed.endsWith('/')) {
+  const untracked = execFileSync('git', ['ls-files', '-z', '-o', '--exclude-standard'], gitOpts);
+  for (const rel of untracked.split('\0')) {
+    if (!rel) continue;
+    if (rel.endsWith('/')) {
       // git only emits a trailing-slash directory entry for an embedded repo.
       // Guard with a .git check anyway, and skip anything else exactly as git
       // itself skips it (we never descend into a non-repo opaque dir).
-      const childDir = path.join(repoDir, trimmed);
+      const childDir = path.join(repoDir, rel);
       if (fs.existsSync(path.join(childDir, '.git'))) {
-        collectGitFiles(childDir, prefix + trimmed, files);
+        collectGitFiles(childDir, prefix + rel, files);
       }
       continue;
     }
-    files.add(normalizePath(prefix + trimmed));
+    files.add(normalizePath(prefix + rel));
   }
 }
 

src/extraction/languages/go.ts

@@ -56,8 +56,12 @@ export const goExtractor: LanguageExtractor = {
     if (!receiver) return undefined;
     // Find the type identifier inside the receiver
     const text = getNodeText(receiver, source);
-    // Extract type name from patterns like "(sl *Type)", "(sl Type)", "(*Type)", "(Type)"
-    const match = text.match(/\*?\s*([A-Za-z_][A-Za-z0-9_]*)\s*\)/);
+    // Extract type name from "(sl *Type)", "(sl Type)", "(*Type)", "(Type)" and
+    // generic receivers "(s *Stack[T])". Anchor on the opening "(" and skip an
+    // optional receiver var name; the old `name)`-anchored pattern never matched
+    // the `[T])` suffix, so generic-type methods were orphaned from their type
+    // (no struct→method `contains` edge). (#583)
+    const match = text.match(/\(\s*(?:[A-Za-z_]\w*\s+)?\*?\s*([A-Za-z_]\w*)/);
     return match?.[1];
   },
 };

src/extraction/tree-sitter.ts

@@ -630,7 +630,19 @@ export class TreeSitterExtractor {
         }
       }
     }
-    if (name === '<anonymous>') return; // Skip anonymous functions
+    if (name === '<anonymous>') {
+      // Don't emit a node for the anonymous wrapper itself, but still visit its
+      // body: AMD/RequireJS and CommonJS module wrappers (`define([], function(){…})`,
+      // `(function(){…})()`) hold named inner functions and calls that would
+      // otherwise be lost — the dispatcher set skipChildren, so nothing else
+      // descends into this subtree. (#528)
+      const body = this.extractor.resolveBody?.(node, this.extractor.bodyField)
+        ?? getChildByField(node, this.extractor.bodyField);
+      if (body) {
+        this.visitFunctionBody(body, '');
+      }
+      return;
+    }
 
     // Check for misparse artifacts (e.g. C++ macros causing "namespace detail" functions)
     // Skip the node but still visit the body for calls and structural nodes