Fixes a bug where patterns with two expressions separated only by
whitespace or optional elements would fail to parse.

The issue was in ExpressionElement.java at line 135-137, where the
code incorrectly skipped processing when the next expression was the
last element in the pattern. This caused patterns like:
- "claude test %number% [of] %number%"
- "location %direction% [of] %location%"

To fail when parsing inputs like:
- "claude test 1 2"
- "location above {_loc}"

The fix removes the incorrect boundary check. When an expression is
the last element, getPossibleInputs() correctly returns the end-of-line
marker "\0", which is properly handled by the existing code.

Includes unit test (ClaudeDebugTest) that verifies both space-separated
and optional text cases work correctly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Fix/expression space parsing