fix(retrieval): multi-hump field-name queries reach their definers (#1319)

Three compounding defects (#1196) made a query bag of object-literal
keys (`profileInfo isTrialEligible quotaInfo billingMethod`) return
unrelated results while the defining files never surfaced:

1. Step 5b title-cased interior humps (profileInfo -> Profileinfo) and
   then compared case-SENSITIVELY, dropping every row SQLite's
   case-insensitive LIKE had just recovered. The hump lookup is now
   case-insensitive with an explicit uppercase-at-match requirement.
2. Step 5b/5c's kind whitelist held only type-like kinds — dead code on
   method-centric codebases. Callable kinds (function/method/component)
   are fetched as a SEPARATE LIKE batch so hot single-word terms can't
   crowd classes out of the length-ordered 200-row batch.
3. explore's named-symbol seeding was exact-name only; a field token
   seeded nothing. A camelCase token with ZERO exact defs now seeds its
   camel-infix definers (callables, hump-boundary or prefix, shortest
   first, capped at 3) — bare lowercase words keep the #1252 stopword
   guard untouched.

The reporter's acceptance query is a pinned e2e test (definer files
present, exact-name seeding unaffected). excalidraw probe: the
canonical flow query (mutateElement renderStaticScene) is byte-
identical; NL queries shift toward more-central callables
(useUIAppState/getDefaultAppState over observer periphery).

Fixes #1196

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

src/index.ts

@@ -8,6 +8,7 @@
 import * as path from 'path';
 import {
   Node,
+  NodeKind,
   Edge,
   FileRecord,
   ExtractionResult,
@@ -1220,6 +1221,20 @@ export class CodeGraph {
     return this.queries.getNodesByNamePrefix(prefix, limit);
   }
 
+  /**
+   * Nodes whose name CONTAINS `substring` (LIKE scan, ASCII-case-insensitive,
+   * shortest-first). The camel-infix lookup FTS can't do — `profileInfo`
+   * inside `getProfileInfoV2` is one FTS token (#1196).
+   */
+  getNodesByNameSubstring(
+    substring: string,
+    options: { kinds?: NodeKind[]; limit?: number; excludePrefix?: boolean } = {}
+  ): Node[] {
+    return this.queries
+      .findNodesByNameSubstring(substring, options)
+      .map((r) => r.node);
+  }
+
   /**
    * Search nodes by text
    */