# Implementation Plan: Inventory Core (040)

**Branch**: `feat/040-inventory-core` | **Date**: 2026-01-07 | **Spec**: `specs/040-inventory-core/spec.md`

## Summary

Implement a tenant-scoped inventory catalog (“last observed”) and an observable sync run system with deterministic selection scoping. Ensure no snapshots/backups are created by sync.

## Constitution Check

- Inventory-first, snapshots-second (sync never creates snapshots)
- Read/write separation (sync is read-only; any future writes require preview/confirmation/audit/tests)
- Single contract path to Graph (Graph access only through existing abstractions/contracts)
- Deterministic capabilities (capabilities resolver output testable)
- Tenant isolation (non-negotiable)
- Automation observable + idempotent (locks, run records, stable error codes, 429/503 handling)
- Data minimization + safe logging

## Deliverables (Phase-friendly)

- Data model for inventory items and sync runs
- Sync engine orchestration and locking strategy
- Deterministic selection hashing
- Capabilities resolver output snapshot tests
- Minimal Filament/CLI surface to trigger and observe sync runs (if required by tasks)

## Out of Scope

- Dependency graph hydration (spec 042)
- Cross-tenant promotion (spec 043)
- Drift reporting (spec 044)
- Lifecycle “deleted” semantics (feature 900)