feat: human-friendly TUI output with --agent flag for JSON/compact

- Replace default JSON output with styled TUI tables and ANSI colors.
- Add -a/--agent global flag: small payloads → JSON, large → pipe-delimited compact.
- Update README to reflect new output behavior and remove JSON-first references.
- Bump version to 2.0.2.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "coinhunter"
-version = "2.0.1"
+version = "2.0.2"
 description = "Binance-first trading CLI for balances, market data, opportunity scanning, and execution."
 readme = "README.md"
 license = {text = "MIT"}