Dexter 2026.4.1

Changes

• Add optional user research rules via .dexter/RULES.md (loaded into the system prompt when present).
• Cache financial API responses locally with per-endpoint TTLs so repeat queries hit disk instead of the network when still fresh.
• Improve financial search aggregation: 15s timeouts on nested sub-tool calls and markdown table-style summaries for key get_financials / get_market_data results (statements, ratios, estimates, etc.).
• Update stock screener modeling: use in for membership, model ranges with gte + lte instead of a single between op, and document decimal vs percent fields (e.g. margins as 0.15 for 15%).

Fixes

• None called out; this release is primarily behavior and UX improvements.