# Sprint 58 Plan: Legacy Ingestion v2 (Semantic Recovery Engine)

## Context

AST-first projection is easy; ingestion remains the bottleneck. Sprint 58 upgrades
legacy ingestion into a semantics-recovery pipeline feeding the new IR.

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## Goals

1. Recover missing intent from legacy code with confidence scoring
2. Surface ambiguity packets and review tasks automatically
3. Add multi-file/system-level recovery (APIs, build, runtime assumptions)
4. Produce migration-ready IR even from weakly annotated legacy sources

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## Steps

### Step 809: Legacy semantic recovery graph engine (12 tests)
### Step 810: Cross-file API intent inference (10 tests)
### Step 811: Build/runtime assumption inference (10 tests)
### Step 812: Ambiguity packet model (`assumed`, `unknown`, `conflict`) (10 tests)
### Step 813: Human review queue generator from ambiguities (10 tests)
### Step 814: Confidence calibration for recovered intent (10 tests)
### Step 815: Legacy->IR migration readiness scoring (8 tests)
### Step 816: `whetstone_ingest_legacy_to_ir` MCP tool (8 tests)
### Step 817: Legacy modernization dossier generator (8 tests)
### Step 818: Sprint 58 integration summary + regression (8 tests)

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## Quality Target

- Reduce manual ambiguity resolution load while keeping fail-closed behavior.