fix(pascal): detect unqualified paren-less calls (DoWork;)

[equipados]

What

A Pascal statement that is nothing but an identifier — DoWork; — is an
unqualified call to a parameterless routine. visitPascalBlock didn't treat it
as one, so only the parenthesised form DoWork() produced a calls edge.

Pascal lets a no-arg routine drop its parens, and in Delphi that is the
convention rather than the exception, so on a real Delphi codebase most
intra-unit calls were invisible to callers / callees / impact. Those tools
didn't return a wrong answer — they returned an empty one, which is harder to
notice.

The qualified form (Obj.Free;) is already handled by
extractPascalParenlessCall (thanks — that landed in 1.5). This is the same
idea one step less qualified.

Measured on a real Delphi codebase

285 .pas/.dpr files from a production Delphi 10.2 ERP (~1.1M LOC):

	calls edges
1.5.0 as-is	2316
with this patch	2711
	+395 (+17%)

How it's scoped

Gated on the identifier being the whole statement:

child.type === 'identifier' &&
node.type === 'statement' &&
node.namedChildCount === 1

Anywhere else — assignment RHS, if condition, any expression — a bare
identifier is indistinguishable from a variable read without type information,
so those are deliberately left alone. That is what the second test locks in:

procedure TFoo.DoThing;
var
  Total, Other: Integer;   // and TFoo has a method also called Total
begin
  Other := Total;                    // variable read, NOT a call
  if Total > 0 then Other := 0;      // variable read, NOT a call
end;

isCalled('TFoo::Total') must stay false.

Tests

Two added next to the existing paren-less test in
__tests__/resolution.test.ts:

• extracts UNQUALIFIED paren-less calls (Reset;, the dominant Delphi idiom) — fails without the change, passes with it.
• does not turn a bare identifier that is NOT a whole statement into a call — the negative case above.

resolution.test.ts + extraction.test.ts: 788 passed. The 5 failures on my
machine (3× PHP include, 1× C/C++ include, 1× gitlink) are identical before and
after the change — pre-existing and unrelated, likely Windows-specific.

tsc --noEmit clean.

Notes

Only src/extraction/tree-sitter.ts changes; Pascal is not part of the Rust
kernel so there is no parity fixture to update.