feat: support PascalCase local-name drift in DSML tool markup parsing

Detect camelCase→PascalCase boundaries between arbitrary prefixes and fixed
local names (tool_calls/invoke/parameter), so that fused forms like
<DSmartToolCalls> are recognized without explicit separator characters.
Also add the underscore-free alias "toolcalls" as a valid DSML local name.
Includes lookalike rejection tests to ensure near-matches like
<DSmartToolCallsExtra> are not falsely accepted.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/node/stream-tool-sieve.test.js

@@ -112,6 +112,23 @@ test('parseToolCalls parses arbitrary-prefixed tool markup shells', () => {
   }
 });
 
+test('parseToolCalls parses camel-prefixed tool markup shell', () => {
+  const payload = '<DSmartToolCalls><DSmartInvoke name="Bash"><DSmartParameter name="command"><![CDATA[git push]]></DSmartParameter><DSmartParameter name="description"><![CDATA[Push dev branch to origin]]></DSmartParameter></DSmartInvoke></DSmartToolCalls>';
+  const calls = parseToolCalls(payload, ['Bash']);
+  assert.equal(calls.length, 1);
+  assert.equal(calls[0].name, 'Bash');
+  assert.deepEqual(calls[0].input, {
+    command: 'git push',
+    description: 'Push dev branch to origin',
+  });
+});
+
+test('parseToolCalls ignores camel-prefixed tool markup lookalike', () => {
+  const payload = '<DSmartToolCallsExtra><DSmartInvoke name="Bash"><DSmartParameter name="command">git push</DSmartParameter></DSmartInvoke></DSmartToolCallsExtra>';
+  const calls = parseToolCalls(payload, ['Bash']);
+  assert.equal(calls.length, 0);
+});
+
 test('parseToolCalls parses fullwidth DSML shell drift', () => {
   const payload = `<ｄＳＭＬ｜tool_calls>
   <ｄＳＭＬ｜invoke name="Read">