feat: add catlog command, agent flag reorder, and TUI polish

- Add `coinhunter catlog` with limit/offset pagination for audit logs
- Optimize audit log reading with deque to avoid loading all history
- Allow `-a/--agent` flag after subcommands
- Fix upgrade spinner artifact and empty line issues
- Render audit log TUI as timeline with low-saturation event colors
- Convert audit timestamps to local timezone in TUI
- Remove futures-related capabilities
- Add conda environment.yml for development
- Bump version to 2.0.9 and update README

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

environment.yml

@@ -0,0 +1,9 @@
+name: coinhunter
+channels:
+  - defaults
+  - conda-forge
+dependencies:
+  - python>=3.10
+  - pip
+  - pip:
+      - -e ".[dev]"