# Sprint 145 Plan: C++ Constructive Editor Fast Path and Toolchain Integration

## Context

To unlock immediate value, hybrid mode must feel native for C++ teams. Sprint 145
optimizes the C++ constructive fast path end-to-end.

---

## Goals

1. Optimize C++ edit->sync->build->feedback loop latency
2. Integrate compile/test diagnostics directly into hybrid editing flow
3. Prioritize battle-tested C++ paths while AST-native language work continues
4. Provide one-call C++ constructive loop orchestration

---

## Steps

### Step 1689: C++ constructive loop state model (10 tests)
### Step 1690: Incremental compile feedback packet model (10 tests)
### Step 1691: C++ test-feedback bridge model (10 tests)
### Step 1692: C++ loop latency budget enforcer model (10 tests)
### Step 1693: `whetstone_run_cpp_constructive_step` MCP tool (8 tests)
### Step 1694: `whetstone_get_cpp_constructive_status` MCP tool (8 tests)
### Step 1695: `whetstone_run_cpp_constructive_loop` MCP tool (8 tests)
### Step 1696: C++ constructive readiness scorer model (8 tests)
### Step 1697: C++ constructive loop report artifact (8 tests)
### Step 1698: Sprint 145 integration summary + regression (8 tests)

---

## Architecture Gate

- C++ loop behavior must be deterministic and bounded
- Feedback packets must be structured and machine-readable
- One-call loop tool must expose explicit stop reasons
- Max 600 lines per header