Fix ordered-list spacing in TUI markdown renderer

[rksharma-owg]

Summary

• fix ordered-list markdown rendering to avoid double spaces after numeric markers
• add a regression test for 1., 2), and bullet-list rendering
• keep the change scoped to the TUI markdown renderer

Testing

• source .venv/bin/activate && pytest tests/test_agent_message_renderer.py

Closes #684

[greptile-apps]

Greptile Summary

This PR fixes spacing for ordered lists in the TUI markdown renderer. The main changes are:

• Skips the full ordered-list marker before rendering item text.
• Normalizes 2) style markers to dot-style output.
• Adds tests for ordered-list and bullet-list spacing.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.
• The renderer slice now matches the ordered-list marker length.
• The added tests cover the spacing behavior changed by this PR.

Important Files Changed

Filename	Overview
strix/interface/tui/renderers/agent_message_renderer.py	Updates ordered-list rendering so the content starts after the full three-character marker.
tests/test_agent_message_renderer.py	Adds focused tests for dot-style ordered lists, paren-style ordered lists, and bullet spacing.

_{Reviews (1): Last reviewed commit: "Fix ordered-list spacing in TUI markdown..." | Re-trigger Greptile}