feat(templates): add aggressive strategy template system

- Add new aggressive.md.jinja template for high-risk gameplay strategy
- Enables template-based strategy switching via Config.template parameter
- Template focuses on multiplicative effects, risk-taking, and resource investment
- Supports testing of dynamic strategy template system

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

Author: S1M0N38

src/balatrollm/templates/aggressive.md.jinja

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+# Aggressive Balatro Strategy
+
+This is an AGGRESSIVE strategy template for testing the new template system.
+
+Key principles:
+- Take high risks for high rewards
+- Prioritize powerful jokers over safe plays
+- Use consumables aggressively
+- Focus on maximizing score multipliers
+
+## Core Strategy
+
+### Joker Selection
+- Always go for legendary and rare jokers
+- Prioritize multiplicative effects over additive bonuses
+- Sell lower-value jokers quickly for space
+
+### Hand Selection
+- Play high-risk, high-reward hands
+- Focus on building towards powerful poker hands
+- Use discards to fish for perfect hands
+
+### Shop Strategy
+- Reroll frequently to find powerful cards
+- Invest heavily in strong jokers
+- Buy consumables that enhance existing synergies
+
+### Resource Management
+- Spend money aggressively on improvements
+- Don't hoard resources - invest them immediately
+- Take calculated risks with blind selections
+
+---
+
+Remember: This is an AGGRESSIVE strategy - take risks to maximize potential!