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feat(stepper): implement PythonStepperEvaluator and add stepper dependencies (#152)

* feat(stepper): implement PythonStepperEvaluator and add stepper dependencies

* Update src/conductor/stepper/reduce.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update src/conductor/stepper/reduce.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* fix(stepper): address all review feedback on PythonStepperEvaluator PR

- Fix substitute() to add explicit VariableDeclarator case, preventing id
  corruption when substituting into variable declarations (Gemini HIGH)
- Add ZeroDivisionError guards for division/modulo by zero and 0**negative
  in both bigint and float arithmetic paths (Gemini MEDIUM)
- Store Python integers as JS bigint throughout the stepper (translate +
  reduce), including proper floor division and Python-compatible modulo
  for negative operands (AaravMalani)
- Replace pass-as-ExpressionStatement with a dedicated PassStatement node
  type, handled explicitly in reduceProgram (AaravMalani)
- Rename PythonStepperEvaluator1 -> PyStepperEvaluator1 to match Py*
  naming convention used by all other evaluators (AaravMalani)
- Fix JSDoc path ../stepper/translate -> ./translate in ast.ts (AaravMalani)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat(stepper): add Python SyntaxProfile for authentic step rendering

PythonStepperRunnerPlugin overrides getSyntaxProfile() to ship pythonSyntaxProfile
(surface-syntax templates + operator/expression precedence for every node type).
The language-agnostic stepper host then renders Python syntax (def, lambda,
if/else, no JS tokens) directly from this data — no per-language host changes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* feat(stepper): rename evaluator/plugin, add builtins and preprocess, expand reduce and tests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthr... (continued)

2211 of 3197 branches covered (69.16%)

Branch coverage included in aggregate %.

709 of 809 new or added lines in 7 files covered. (87.64%)

5558 of 7007 relevant lines covered (79.32%)

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