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>

README.md

@@ -88,6 +88,11 @@ coinhunter opportunity portfolio
 coinhunter opportunity scan
 coinhunter opportunity scan --symbols BTCUSDT ETHUSDT SOLUSDT
 
+# Audit log
+coinhunter catlog
+coinhunter catlog -n 20
+coinhunter catlog -n 10 -o 10
+
 # Self-upgrade
 coinhunter upgrade
 
@@ -127,6 +132,8 @@ Events include:
 - `opportunity_portfolio_generated`
 - `opportunity_scan_generated`
 
+Use `coinhunter catlog` to read recent entries in the terminal. It aggregates across all days and supports pagination with `-n/--limit` and `-o/--offset`.
+
 ## Development
 
 Clone the repo and install in editable mode:
@@ -137,6 +144,13 @@ cd coinhunter-cli
 pip install -e ".[dev]"
 ```
 
+Or use the provided Conda environment:
+
+```bash
+conda env create -f environment.yml
+conda activate coinhunter
+```
+
 Run quality checks:
 
 ```bash