# Cross-User Workspace Policy v3.3

## Rule

The shared Substrate mechanism is not the same thing as a shared writable source.

Each user/session/GPT route receives a workspace boundary.

## Workspace layers

```text
Public read layer
Private user/session workspace
Collaborative overlay proposal queue
Human-reviewed canonical update route
```

## Writes allowed

Allowed:

```text
workspace output
audit logs
receipts
collaborative overlay proposals
lexicon overlay proposals
```

Not allowed:

```text
direct canonical artifact mutation
direct canonical Primordial Lexicon mutation
public contribution treated as accepted source
unreviewed AI output treated as closure
```

## Contributor credit

Every contribution capsule should preserve:

```text
human/session contributor
AI adapter contributor
source nodes referenced
review state
write scope
receipt
```