feat: workspace-based multi-tenancy, replacing user as tenancy axis (#840)

Introduces `workspace` as the isolation boundary for config, flows,
library, and knowledge data. Removes `user` as a schema-level field
throughout the code, API specs, and tests; workspace provides the
same separation more cleanly at the trusted flow.workspace layer
rather than through client-supplied message fields.

Design
------
- IAM tech spec (docs/tech-specs/iam.md) documents current state,
  proposed auth/access model, and migration direction.
- Data ownership model (docs/tech-specs/data-ownership-model.md)
  captures the workspace/collection/flow hierarchy.

Schema + messaging
------------------
- Drop `user` field from AgentRequest/Step, GraphRagQuery,
  DocumentRagQuery, Triples/Graph/Document/Row EmbeddingsRequest,
  Sparql/Rows/Structured QueryRequest, ToolServiceRequest.
- Keep collection/workspace routing via flow.workspace at the
  service layer.
- Translators updated to not serialise/deserialise user.

API specs
---------
- OpenAPI schemas and path examples cleaned of user fields.
- Websocket async-api messages updated.
- Removed the unused parameters/User.yaml.

Services + base
---------------
- Librarian, collection manager, knowledge, config: all operations
  scoped by workspace. Config client API takes workspace as first
  positional arg.
- `flow.workspace` set at flow start time by the infrastructure;
  no longer pass-through from clients.
- Tool service drops user-personalisation passthrough.

CLI + SDK
---------
- tg-init-workspace and workspace-aware import/export.
- All tg-* commands drop user args; accept --workspace.
- Python API/SDK (flow, socket_client, async_*, explainability,
  library) drop user kwargs from every method signature.

MCP server
----------
- All tool endpoints drop user parameters; socket_manager no longer
  keyed per user.

Flow service
------------
- Closure-based topic cleanup on flow stop: only delete topics
  whose blueprint template was parameterised AND no remaining
  live flow (across all workspaces) still resolves to that topic.
  Three scopes fall out naturally from template analysis:
    * {id} -> per-flow, deleted on stop
    * {blueprint} -> per-blueprint, kept while any flow of the
      same blueprint exists
    * {workspace} -> per-workspace, kept while any flow in the
      workspace exists
    * literal -> global, never deleted (e.g. tg.request.librarian)
  Fixes a bug where stopping a flow silently destroyed the global
  librarian exchange, wedging all library operations until manual
  restart.

RabbitMQ backend
----------------
- heartbeat=60, blocked_connection_timeout=300. Catches silently
  dead connections (broker restart, orphaned channels, network
  partitions) within ~2 heartbeat windows, so the consumer
  reconnects and re-binds its queue rather than sitting forever
  on a zombie connection.

Tests
-----
- Full test refresh: unit, integration, contract, provenance.
- Dropped user-field assertions and constructor kwargs across
  ~100 test files.
- Renamed user-collection isolation tests to workspace-collection.

trustgraph-base/trustgraph/clients/config_client.py

@@ -33,6 +33,7 @@ class ConfigClient(BaseClient):
             subscriber=None,
             input_queue=None,
             output_queue=None,
+            workspace="default",
             **pubsub_config,
     ):
 
@@ -51,10 +52,13 @@ class ConfigClient(BaseClient):
             **pubsub_config,
         )
 
+        self.workspace = workspace
+
     def get(self, keys, timeout=300):
 
         resp = self.call(
             operation="get",
+            workspace=self.workspace,
             keys=[
                 ConfigKey(
                     type = k["type"],
@@ -78,6 +82,7 @@ class ConfigClient(BaseClient):
 
         resp = self.call(
             operation="list",
+            workspace=self.workspace,
             type=type,
             timeout=timeout
         )
@@ -88,6 +93,7 @@ class ConfigClient(BaseClient):
 
         resp = self.call(
             operation="getvalues",
+            workspace=self.workspace,
             type=type,
             timeout=timeout
         )
@@ -101,10 +107,31 @@ class ConfigClient(BaseClient):
             for v in resp.values
         ]
 
+    def getvalues_all_ws(self, type, timeout=300):
+        """Fetch all values of a given type across all workspaces.
+        Returns a list of dicts including a 'workspace' field."""
+
+        resp = self.call(
+            operation="getvalues-all-ws",
+            type=type,
+            timeout=timeout
+        )
+
+        return [
+            {
+                "workspace": v.workspace,
+                "type": v.type,
+                "key": v.key,
+                "value": v.value,
+            }
+            for v in resp.values
+        ]
+
     def delete(self, keys, timeout=300):
 
         resp = self.call(
             operation="delete",
+            workspace=self.workspace,
             keys=[
                 ConfigKey(
                     type = k["type"],
@@ -121,6 +148,7 @@ class ConfigClient(BaseClient):
 
         resp = self.call(
             operation="put",
+            workspace=self.workspace,
             values=[
                 ConfigValue(
                     type = v["type"],
@@ -138,6 +166,7 @@ class ConfigClient(BaseClient):
 
         resp = self.call(
             operation="config",
+            workspace=self.workspace,
             timeout=timeout
         )
 

trustgraph-base/trustgraph/clients/document_embeddings_client.py

@@ -35,11 +35,11 @@ class DocumentEmbeddingsClient(BaseClient):
         )
 
     def request(
-            self, vector, user="trustgraph", collection="default",
+            self, vector, collection="default",
             limit=10, timeout=300
     ):
         return self.call(
-            user=user, collection=collection,
+            collection=collection,
             vector=vector, limit=limit, timeout=timeout
         ).chunks
 

trustgraph-base/trustgraph/clients/document_rag_client.py

@@ -33,14 +33,13 @@ class DocumentRagClient(BaseClient):
             output_schema=DocumentRagResponse,
         )
 
-    def request(self, query, user="trustgraph", collection="default",
+    def request(self, query, collection="default",
                 chunk_callback=None, explain_callback=None, timeout=300):
         """
         Request a document RAG query with optional streaming callbacks.
 
         Args:
             query: The question to ask
-            user: User identifier
             collection: Collection identifier
             chunk_callback: Optional callback(text, end_of_stream) for text chunks
             explain_callback: Optional callback(explain_id, explain_graph, explain_triples) for explain notifications
@@ -71,7 +70,7 @@ class DocumentRagClient(BaseClient):
             return False  # Continue receiving
 
         self.call(
-            query=query, user=user, collection=collection,
+            query=query, collection=collection,
             inspect=inspect, timeout=timeout
         )
 

trustgraph-base/trustgraph/clients/graph_embeddings_client.py

@@ -35,11 +35,11 @@ class GraphEmbeddingsClient(BaseClient):
         )
 
     def request(
-            self, vector, user="trustgraph", collection="default",
+            self, vector, collection="default",
             limit=10, timeout=300
     ):
         return self.call(
-            user=user, collection=collection,
+            collection=collection,
             vector=vector, limit=limit, timeout=timeout
         ).entities
 

trustgraph-base/trustgraph/clients/graph_rag_client.py

@@ -34,7 +34,7 @@ class GraphRagClient(BaseClient):
         )
 
     def request(
-            self, query, user="trustgraph", collection="default",
+            self, query, collection="default",
             chunk_callback=None,
             explain_callback=None,
             timeout=500
@@ -44,7 +44,6 @@ class GraphRagClient(BaseClient):
 
         Args:
             query: The question to ask
-            user: User identifier
             collection: Collection identifier
             chunk_callback: Optional callback(text, end_of_stream) for text chunks
             explain_callback: Optional callback(explain_id, explain_graph, explain_triples) for explain notifications
@@ -76,7 +75,7 @@ class GraphRagClient(BaseClient):
             return False  # Continue receiving
 
         self.call(
-            user=user, collection=collection, query=query,
+            collection=collection, query=query,
             inspect=inspect, timeout=timeout
         )
 

trustgraph-base/trustgraph/clients/row_embeddings_client.py

@@ -35,11 +35,11 @@ class RowEmbeddingsClient(BaseClient):
         )
 
     def request(
-            self, vector, schema_name, user="trustgraph", collection="default",
+            self, vector, schema_name, collection="default",
             index_name=None, limit=10, timeout=300
     ):
         kwargs = dict(
-            user=user, collection=collection,
+            collection=collection,
             vector=vector, schema_name=schema_name,
             limit=limit, timeout=timeout
         )

trustgraph-base/trustgraph/clients/triples_query_client.py

@@ -45,16 +45,15 @@ class TriplesQueryClient(BaseClient):
         return Term(type=LITERAL, value=ent)
 
     def request(
-            self, 
+            self,
             s, p, o,
-            user="trustgraph", collection="default",
+            collection="default",
             limit=10, timeout=120,
     ):
         return self.call(
             s=self.create_value(s),
             p=self.create_value(p),
             o=self.create_value(o),
-            user=user,
             collection=collection,
             limit=limit,
             timeout=timeout,