feat: named tables and array type

[dvhthomas]

Summary

• Add named markdown tables as computation sources via <!-- table: name (col1, col2) --> directive
• Introduce first-class Array type with element-wise arithmetic and scalar broadcasting
• Add aggregate functions (sum(), avg(), min(), max(), count()) on arrays
• Enable per-row array interpolation in table cells

Closes #118

Documents

• Requirements
• Implementation Plan — 10 units, 6 phases

Example

<!-- table: rates (role, rate, hc) -->
| Role   | Hourly Rate | Headcount |
|--------|-------------|-----------|
| Senior | $250/hr     | 3         |
| Junior | $150/hr     | 5         |

---

line_costs = rates.rate * rates.hc
total = sum(line_costs)

Test plan

• Array and Table type unit tests
• Lexer DOT token generalization (no decimal regression)
• Parser MemberAccess + relaxed sum/avg arg counts
• Table extraction from TextBlocks (all 3 evaluator paths)
• Element-wise arithmetic + aggregate functions
• Display formatting + JSON output
• Array interpolation in table cells
• Classifier recognizes dot-access patterns
• Golden tests: full consulting SOW end-to-end
• task test + task quality pass

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