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whetstone_DSL/sprint176_plan.md

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# Sprint 176 Plan: Real Sync/Regenerate/Merge Constructive Paths
## Context
`docs/constructive_editing_runtime_plan.md` Phase B requires replacing synthetic
sync/regenerate/merge outcomes with real Text<->AST and merge-policy execution.
## Goals
1. Route sync tools through real text->AST paths
2. Route regeneration tools through real AST->text paths
3. Route merge tools through real conflict detection + policy decisions
## Steps
### Step 1919: Real sync tool binding (10 tests)
Primary files:
- `editor/src/mcp/RegisterSprint142Tools.h`
- `editor/src/TextASTSync.h`
Tests (10): supported-language sync roundtrip, deterministic sync diffs, invalid
syntax diagnostics, partial sync conflict tagging, and stable schema output.
### Step 1920: Real regenerate tool binding (10 tests)
Primary files:
- `editor/src/mcp/RegisterSprint143Tools.h`
- language generators used by runtime path
Tests (10): AST->text regeneration for representative languages, deterministic
formatting invariants, annotation preservation, and failure packet consistency.
### Step 1921: Real merge conflict region + policy outcomes (10 tests)
Primary files:
- `editor/src/mcp/RegisterSprint144Tools.h`
- `editor/src/graduation/ConflictRegionDetectorModel.h`
- `editor/src/graduation/MergePolicyEngineModel.h`
Tests (10): conflict region detection accuracy, deterministic region ordering,
policy-decision reproducibility, merge packet schema validity, and retry behavior.
### Step 1922: Cross-language sync/regenerate/merge integration suite (8 tests)
Add cross-language integration cases for `cpp`, `rust`, `python`, `typescript`.
Tests (8): end-to-end sync->regen->merge loop, mixed-conflict handling, and
deterministic replay over repeated runs.
### Step 1923: Sprint 176 Integration Summary (8 tests)
Add `editor/src/Sprint176IntegrationSummary.h`.
Record:
- `steps_completed=5`
- `sync_tools_use_real_text_ast_paths=true`
- `regeneration_tools_use_real_generator_paths=true`
- `merge_tools_emit_real_conflict_policy_outcomes=true`
- `success=true`
## Architecture Gate
- Merge/sync/regenerate outputs must be derived from real engine execution, not
synthetic placeholders
- Conflict resolution decisions must be deterministic and auditable