feat: sync open-source context and capsule removal

- remove legacy contexts surfaces from the app, MCP bridge, standalone server, and docs
- keep getContext and retrieveQueryContext while aligning the simplified graph-only contract
- harden dev startup migration behavior and disable the accidental chat surface in open source

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docs/9_open-source.md

@@ -1,47 +1,22 @@
 # Open Source Surface
 
-The open-source RA-H surface should match the main app contract where product behavior is shared:
+`ra-h_os` should match the main app contract wherever the underlying product behavior is shared.
+
+That means the open-source docs should reflect:
 
 - no runtime `dimensions` model,
-- optional soft `contexts`,
-- no automatic context assignment on write,
 - node quality driven by title, description, source, metadata, and edges.
 
-## What RA-H OS Includes
-
-- local SQLite graph
-- local UI
-- standalone MCP server
-- shared skills system
-- BYO API key path
-
-## What RA-H OS Does Not Promise
-
-- every private-app surface
-- private subscription/auth behavior
-- official support for every local model stack or vector backend someone can wire up
-- a guarantee that every community setup is first-class supported
-
-## Support Boundary
-
-Supported core path:
-- RA-H OS app
-- local SQLite
-- standard standalone MCP server
-- documented repo install flow
-
-Reasonable community pattern:
-- local model or alternate MCP-capable chat surface layered on top of the documented contract
-
-Experimental / user-owned:
-- custom vector backends
-- unsupported deployment targets
-- aggressive local-model substitutions that degrade tool quality
+It should also explain the open-source-specific reality clearly:
+- no private-app-only promises
+- a practical standalone MCP install path
+- pinned package versions for external-agent setup
+- clear verification and troubleshooting steps
+- honest support boundaries for fully local or community setups
 
 ## Important App Routes
 
 - `app/api/nodes/`
-- `app/api/contexts/`
 - `app/api/edges/`
 - `app/api/rah/chat/`
 - extraction routes
@@ -52,3 +27,11 @@ Experimental / user-owned:
 Main `ra-h` ships first.
 
 `ra-h_os` is a required follow-up port of the same contract, not a place to preserve older taxonomy behavior.
+
+## Required Docs Surfaces In `ra-h_os`
+
+- `README.md` for terse install + MCP quickstart
+- `docs/README.md` for the start-here path
+- `docs/8_mcp.md` for the full MCP setup, verification, memory-file guidance, and troubleshooting path
+- `docs/10_full-local.md` for clearly caveated local/community patterns
+- `apps/mcp-server-standalone/README.md` for package-level install details that match the repo docs