Bug: Tilde (~) in project_path not expanded, causes silent empty results #154

Description

When passing a path containing ~ (e.g., "~/workspace/project") to CLDK.analysis(), the tilde is not expanded. This causes the analyzer to interpret ~ as a literal directory name relative to the current working directory, leading to:

1. Silent empty results (empty PyApplication with no classes/methods)
2. Creation of spurious directories like ./~/workspace/.../.codeanalyzer/

Reproduction

from cldk import CLDK

pa = CLDK("python").analysis("~/workspace/codellm-devkit/codeanalyzer-python")
pa.get_application_view()  # Returns empty PyApplication

Root Cause

Path("~/...") does not expand ~ — it must be explicitly expanded via .expanduser(). The SDK was passing the path directly to Path() without expansion in:

• cldk/core.py — analysis() method
• cldk/analysis/python/codeanalyzer/codeanalyzer.py — PyCodeanalyzer.__init__()

Expected Behavior

• Tilde should be expanded to the user's home directory
• Invalid/non-existent paths should raise a clear error, not return empty results

Fix

Call .expanduser().resolve() on path inputs and validate the directory exists before proceeding with analysis.

Fixed in: #153