Replace the git-pinned HTA dependency with traceinsight #235

Problem

Chakra pins HolisticTraceAnalysis to a git commit. PyPI rejects git dependencies, so main can't be published. That commit also breaks critical-path analysis under pandas 2.x, and chakra_trace_link reports success anyway.

Task

Depend on traceinsight, HTA's PyPI distribution (the module is still hta). Remove the clone-and-install steps from CI and USER_GUIDE.md.

Acceptance criteria

• No git URL in the wheel's Requires-Dist. Evidence: wheel METADATA.
• chakra_trace_link computes the critical path on a real trace with pandas 2.x and with pandas 3.x. Evidence: review comment with logs.
• CI installs HTA from PyPI. Evidence: workflow diff.

Original work started in #217