chore: release v3.0.0

- Bump version to 3.0.0 in pyproject.toml
- Update README with What's New section and new command examples
  (--window for tickers, --dry-run for catlog)

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

README.md

@@ -19,6 +19,14 @@
 
 ---
 
+## What's New in 3.0
+
+- **Split decision models** — portfolio (add/hold/trim/exit) and opportunity (enter/watch/skip) now use independent scoring logic.
+- **Configurable ticker windows** — `market tickers` supports `--window 1h`, `4h`, or `1d`.
+- **Live / dry-run audit logs** — audit logs are written to separate subdirectories; use `catlog --dry-run` to review simulations.
+- **Flattened commands** — `account`, `opportunity`, and `config` are now top-level for fewer keystrokes.
+- **Runtime config management** — `config get`, `config set`, and `config key/secret` let you edit settings without touching files manually.
+
 ## Install
 
 For end users, install from PyPI with [pipx](https://pipx.pypa.io/) (recommended) to avoid polluting your system Python:
@@ -98,9 +106,9 @@ coinhunter account --agent
 coin a
 
 # Market (aliases: m)
-coinhunter market tickers BTCUSDT ETH/USDT sol-usdt
+coinhunter market tickers BTCUSDT ETH/USDT sol-usdt --window 1h
 coinhunter market klines BTCUSDT ETHUSDT --interval 1h --limit 50
-coin m tk BTCUSDT ETHUSDT
+coin m tk BTCUSDT ETHUSDT -w 1d
 coin m k BTCUSDT -i 1h -l 50
 
 # Trade (buy / sell are now top-level commands)
@@ -123,6 +131,7 @@ coin o -s BTCUSDT ETHUSDT
 coinhunter catlog
 coinhunter catlog -n 20
 coinhunter catlog -n 10 -o 10
+coinhunter catlog --dry-run
 
 # Configuration management (aliases: cfg, c)
 coinhunter config get                    # show all config