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feat(ucalc): rewrite pattern table and rewrites command (#673)

* 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): rewrite pattern table and rewrites command (#668)

Add a curated database of 7 numerically unstable patterns and their
stable alternatives in rewrite_patterns.hpp:

1. sqrt_diff:     sqrt(a)-sqrt(b) -> (a-b)/(sqrt(a)+sqrt(b))
2. quadratic:     unstable root -> stable alternative
3. log1p:         log(1+x) -> log1p(x)
4. expm1:         exp(x)-1 -> expm1(x)
5. half_angle:    1-cos(x) -> 2*sin(x/2)^2
6. sin_diff:      sin(a)-sin(b) -> product-to-sum
7. cos_ratio:     (1-cos(x))/x^2 -> sinc form

Each pattern includes: id, name, unstable/stable forms, condition,
and explanation of why the original is numerically unstable.

Add `rewrites` command that lists all patterns with descriptions.
All output formats: plain (detailed), JSON (full fields), CSV, quiet.

Data for Phase 4 (AST matching, #669) to match against.

Resolves #668

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

---------

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

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