feat: Oracle Integration with entrenar CITL

[noahgift]

Summary

Integrate entrenar's CITL (Compiler-in-the-Loop Training) oracle into decy for cost-free steady-state transpilation. Query accumulated fix patterns from .apr files before falling back to LLM.

Motivation

• 74% of C→Rust errors are ownership/lifetime-related (E0506, E0499, E0382, E0597, E0515)
• Cross-project pattern transfer: Ownership fixes from depyler are directly applicable
• Cost model: LLM-only = $182K/year vs Oracle @ 80% hit = $36K/year ($146K savings)

Implementation Phases

Week	Deliverable
0	Create paiml/reprorusted-c-cli bootstrap corpus
1	decy-oracle crate skeleton, OracleConfig
2	Oracle struct, suggest_fix(), pattern loading
3	CLI --oracle flag, auto-retry loop
4	Cross-project transfer from depyler
5	First bootstrap session on reprorusted-c-cli
6	Metrics, observability, integration tests

CLI Interface

# Basic oracle usage
decy transpile malloc_wrapper.c --oracle

# Auto-fix with high threshold
decy transpile src/cat.c --oracle --auto-fix --oracle-threshold 0.85

# Import patterns from depyler
decy transpile project/ --oracle --import-depyler ~/.depyler/decision_patterns.apr

Success Metrics

Week	Oracle Hit Rate	LLM Cost Reduction
4	35%	35%
12	75%	75%
20	85%+	85%+

Dependencies

• entrenar with citl feature
• paiml/reprorusted-c-cli (new repo - coreutils subset)
• depyler patterns for cross-project seeding

Specification

Full spec: docs/specifications/oracle-integration-spec.md

• 10 peer-reviewed citations
• C-specific decision categories
• Integration with decy-ownership
• Bootstrap corpus structure

References

• depyler#172 - Oracle Query Loop
• entrenar CITL - Pattern store docs

[noahgift]

Triage: P3 — Oracle Integration with entrenar CITL

Priority: P3 (feature request)
Status: Open
Impact: Would enable ML-powered transpilation suggestions via entrenar

Assessment

Forward-looking feature. Depends on entrenar CITL being stable and decy having a training data pipeline. Nice-to-have but no current user demand.

[noahgift]

Triage (2026-03-31): Feature request. No work started — keeping open as backlog.