Keep visualization worker alive until explicit stop

docs/NEW_PROJECT_QUICKSTART.md

@@ -23,6 +23,7 @@ The DocForge repository contains the complete generic CLI and stdio MCP server.
   multi-node framing, visible node selection, Space-to-center, mouse-wheel zoom, left-button drag
   panning, zoom controls, viewport reset, relationship color and symbol keys, and an upstream
   lineage Flow view.
+- `docforge_stop_visualization`, which explicitly stops the current project's persistent viewer.
 - Isolated documentation changesets, proposal validation, diffs, and escaped HTML previews when a
   proposal writer and render view are configured.
 
@@ -184,7 +185,7 @@ Add a project-specific stdio MCP server to the agent host:
 Restart or reload the agent host. Confirm that it exposes tools beginning with
 `docforge_project_info`, `docforge_get_node`, `docforge_search`, `docforge_dependencies`,
 `docforge_impact`, `docforge_get_context`, `docforge_visualize`, and
-`docforge_create_changeset`.
+`docforge_stop_visualization`, and `docforge_create_changeset`.
 
 Omit `--proposal-writer` for a read-only integration.
 
@@ -290,7 +291,8 @@ Require these adapter acceptance checks:
 - Missing targets, duplicate IDs, unsafe paths, unsorted metadata, and invalid hashes fail closed.
 - Building the graph does not import the application or cause runtime, network, database, or
   filesystem side effects.
-- Read-only MCP exposes only the fixed DocForge read surface, including `docforge_visualize`.
+- Read-only MCP exposes only the fixed DocForge read surface, including visualization start and
+  explicit viewer shutdown.
 - Proposal-enabled MCP cannot modify derived source facts or write outside confined changeset and
   preview roots.
 - Build, check, MCP protocol tests, adapter tests, and the owning project's full test gate pass.
@@ -337,8 +339,7 @@ Place this policy in the project's `AGENTS.md` and adjust the manual path and pr
 - If DocForge reports stale state, missing nodes, invalid edges, or an index mismatch, stop and
   repair or rebuild the graph before claiming the work complete.
 - When asked to “visualize” the project or a node, call `docforge_visualize`. The viewer is
-  loopback-only and read-only. An open page renews its bounded lease across short MCP transactions;
-  explicit process termination closes it, and an abandoned page expires automatically.
+  loopback-only, read-only, and persists until `docforge_stop_visualization` explicitly stops it.
 ```
 
 The policy is what makes DocForge part of normal development rather than an optional lookup tool.