# Sprint 177 Plan: Real Toolchain Provider Execution + Diagnostic Canonicalization

## Context
`docs/constructive_editing_runtime_plan.md` Phase C requires runtime-detected
toolchain execution and canonical diagnostics from real provider outputs.

## Goals
1. Make provider listing/probing reflect runtime reality
2. Execute real build/test probes via provider routes
3. Normalize provider/LSP diagnostics into canonical payloads

## Steps

### Step 1924: Runtime provider discovery + listing (10 tests)
Primary files:
- `editor/src/mcp/RegisterSprint151Tools.h`
- provider discovery/runtime modules

Tests (10): detected providers schema, missing-provider behavior, deterministic
ordering, environment-scoped visibility, and backward compatibility fields.

### Step 1925: Real provider probe execution paths (10 tests)
Primary files:
- `editor/src/BuildSystem.h`
- provider probe invocation handlers

Tests (10): probe success/failure paths, timeout + cleanup behavior, exit-code
mapping, deterministic command metadata, and strict-mode fail semantics.

### Step 1926: Canonical diagnostic normalization from provider/LSP output (10 tests)
Primary files:
- `editor/src/StructuredDiagnostics.h`
- `editor/src/LspOps.h`
- `editor/src/graduation/DiagnosticNormalizationCanonicalModel.h`

Tests (10): multi-provider parse coverage, fallback normalization, dedupe policy,
deterministic ordering/truncation, category mapping, and schema validation.

### Step 1927: Representative toolchain fixture suite (8 tests)
Add fixtures for C++/Rust/Python/Go toolchain and lint outputs.

Tests (8): fixture parser stability, canonical packet consistency, and identical
output across repeated runs.

### Step 1928: Sprint 177 Integration Summary (8 tests)
Add `editor/src/Sprint177IntegrationSummary.h`.
Record:
- `steps_completed=5`
- `runtime_provider_listing_active=true`
- `real_provider_probe_execution_active=true`
- `canonical_diagnostics_from_provider_outputs=true`
- `success=true`

## Architecture Gate
- Provider probes must execute real commands or emit explicit skipped/blocked status
- Diagnostics must be canonicalized into a deterministic machine-readable format