# Sprint 143 Plan: AST-to-Text Deterministic Regeneration with C++ Style Guards

## Context

Hybrid authoring requires AST changes to regenerate readable, stable C++ source.
Sprint 143 adds deterministic regeneration with style/format guardrails.

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## Goals

1. Regenerate C++ text from AST with stable formatting
2. Preserve user style profile and ordering where policy allows
3. Minimize noisy diffs from semantically neutral changes
4. Expose regeneration decisions for auditability

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## Steps

### Step 1669: AST-to-text regeneration policy schema (10 tests)
### Step 1670: C++ formatting/styling guard model (10 tests)
### Step 1671: Stable include/order regeneration model (10 tests)
### Step 1672: Semantic-noise diff suppressor model (10 tests)
### Step 1673: `whetstone_regenerate_text_from_ast` MCP tool (8 tests)
### Step 1674: `whetstone_preview_regenerated_diff` MCP tool (8 tests)
### Step 1675: `whetstone_get_regeneration_decisions` MCP tool (8 tests)
### Step 1676: Regeneration quality scorer model (8 tests)
### Step 1677: Regeneration stability report artifact (8 tests)
### Step 1678: Sprint 143 integration summary + regression (8 tests)

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## Architecture Gate

- Regeneration must be deterministic and reproducible
- Style guard output must avoid non-semantic churn
- Decision logs must be structured and machine-readable
- Max 600 lines per header