fix(pascal): resolve chained factory calls TFoo.GetInstance().DoIt() (#750) (#791)

Ports the #645/#608 chained-receiver mechanism to Pascal/Delphi — which I'd
previously mis-scoped as blocked. The paren'd chained form extracts fine; it just
hit the chained-call gap like the others (with a decoy, `TFoo.GetInstance().DoIt()`
mis-resolved to a same-named method on an unrelated class).

- pascal.ts: getReturnType reads the method's `typeref` (a `function GetInstance:
  TBar` returns TBar; an interface return `IFoo` is captured too).
- tree-sitter.ts: extractPascalCall now re-encodes a chained call `TFoo.GetInstance().DoIt`
  (the exprDot's receiver is an exprCall) instead of collapsing it to bare `DoIt`.
  Gated on the Delphi type-naming convention (`TFoo`/`IFoo`) so a capitalized
  VARIABLE chain (Pascal capitalizes locals too — `Curve.X().Y()`, `Self.X().Y()`)
  stays bare and keeps its existing bare-name resolution.
- name-matcher.ts: `pascal` joins the dotted-chain gate + CHAIN_LANGUAGES +
  CONSTRUCTS_VIA_BARE_CALL (a `TFoo(x)` typecast yields a TFoo). When the factory's
  return type wasn't captured (a `constructor Create` has no `: TBar` but returns
  its class), resolve the method on the factory class itself. resolveMethodOnType
  validates, so a wrong inference yields no edge.

Validation: 4 synthetic tests (factory+decoy, constructor chain, typecast chain,
absent-method safety). Real-repo A/B on PascalCoin (772 files): +19 / -18 — 15 of
the -18 are correct class→interface retargets (`GetInstance(): IAsn1OctetString`
resolves `.GetOctets` on the declared interface, not baseline's concrete-class
guess); 3 are negligible drops (0.02%). EXTRACTION_VERSION 15->16. Full suite green.

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

src/extraction/languages/pascal.ts

@@ -17,6 +17,16 @@ export const pascalExtractor: LanguageExtractor = {
   bodyField: 'body',
   paramsField: 'args',
   returnField: 'type',
+  // Pascal/Delphi `function GetInstance: TBar` — the return type is a `typeref`
+  // child. Capture its bare class name for the chained static-factory call
+  // mechanism (#750). A procedure (no return) has no typeref → undefined.
+  getReturnType: (node, source) => {
+    const typeref = node.namedChildren.find((c: SyntaxNode) => c.type === 'typeref');
+    if (!typeref) return undefined;
+    const id = typeref.namedChildren.find((c: SyntaxNode) => c.type === 'identifier') ?? typeref;
+    const name = getNodeText(id, source).trim();
+    return /^[A-Za-z_]\w*$/.test(name) ? name : undefined;
+  },
   getSignature: (node, source) => {
     const args = getChildByField(node, 'args');
     const returnType = node.namedChildren.find(