# Architecture Decision Records

Each ADR captures a single architectural decision: the context, the decision itself, the consequences, and the alternatives considered. ADRs are immutable once accepted. Superseded ADRs stay in this folder with a pointer to the newer ADR.

## Status definitions

- **PROPOSED**: drafted, awaiting decision
- **ACCEPTED**: decision is in effect
- **SUPERSEDED**: replaced by a later ADR (link forward)
- **DEPRECATED**: no longer in effect, no replacement

## Index

| ADR | Title | Status |
|-----|-------|--------|
| [001](ADR-001-asset-as-platform-contract.md) | Asset model is the platform contract | ACCEPTED |
| [002](ADR-002-plugin-versioning.md) | Plugin contract versioning (semver) | ACCEPTED |
| [003](ADR-003-plugin-distribution.md) | Plugin distribution model | ACCEPTED |
| [004](ADR-004-deployment-topology.md) | Deployment topology (per-site instances) | ACCEPTED |
| [005](ADR-005-equipment-vs-measuringtools.md) | Equipment vs measuringtools plugin scope | ACCEPTED |
| [006](ADR-006-collector-contract.md) | Plugin collector contract pattern | ACCEPTED |

## Authoring

When proposing a new decision, copy the most recent ADR as a template, increment the number, and update this index. Do not edit accepted ADRs in place; supersede them with a new one.