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feat(ucalc): AST node types and expression tree builder (#671)

* docs(ucalc): AST evaluator conversion plan for Epic #642

Plan for converting the expression evaluator to AST-based with
provenance tracking, rewrite pattern database, and structural
pattern matching. Five phases, each delivering standalone value.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* feat(ucalc): AST node types and expression tree builder (#666)

Add Abstract Syntax Tree representation to the expression evaluator:

- ASTNode variant type: Literal, Variable, Constant, BinaryOp,
  UnaryOp, FunctionCall
- build_ast() method on ExpressionEvaluator that builds the tree
  using the same recursive-descent grammar as evaluate()
- print_ast(): indented tree visualization
- ast_to_string(): compact round-trip expression string
- ast command in ucalc: shows tree structure in plain/JSON/quiet

Example:
  ucalc> ast (-b + sqrt(b^2 - 4*a*c)) / (2*a)
    `-- op:/
        |-- op:+
        |   |-- unary:negate
        |   |   `-- var:b
        |   `-- fn:sqrt
        |       `-- op:-
        |           |-- op:^
        |           |   |-- var:b
        |           |   `-- 2
        |           `-- op:*
        |               |-- op:*
        |               |   |-- 4
        |               |   `-- var:a
        |               `-- var:c
        `-- op:*
            |-- 2
            `-- var:a

Foundation for provenance tracking (#667), pattern matching (#669),
and rewrite suggestions (#642 Epic).

Resolves #666

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

44574 of 52858 relevant lines covered (84.33%)

6107848.32 hits per line

Coverage Regressions

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ID Job ID Ran Files Coverage
1 23710545043.1 630
84.33
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Source Files on build 23710545043