feat(rag): replace LiteParse flows with LightRAG provider

REASONIX.md

@@ -9,6 +9,7 @@
 - Rust SQLite control-plane 已承接默认 auth、membership、share grants、sync state、AI policy、ACP/Hermes runtime session 等控制面；Convex / 服务端不再是默认正文、附件、AI 会话全文主存储，只保留历史迁移源、显式 cloud source、compat 和 sync replica 边界。
 - `mnote-web` 是当前 3000 owner；旧 Next / React / wolai-frontend 已移入 `recycle/`，默认不作为当前实现依据。
 - 前端 runtime 已完成第一轮模块级拆分；查浏览器 JS 功能默认先看 `rust/crates/mnote-web/browser/*.js`，查 tiptap island 行为默认先看 `rust/spikes/leptos-tiptap-spike/src/editor_runtime/*.rs`。不要把 `layout.rs` / `tree.rs` / `web_shell.rs` 的历史 raw string 当作当前符号定位入口。
+- Knowledge RAG 当前统一到 LightRAG：LiteParse、旧 OCR sidecar、旧 evidence search / local-index agent tools 不再作为默认 fallback；LightRAG 负责 OCR / parse / index / RAG，MNote 负责 source registry、权限、FileTree 灯号、资料库 UI、dashboard/status 和 citation/open-reference。当前模型口径为 `aigc/qwen-3.5`。
 
 ## Stack
 
@@ -24,6 +25,8 @@
 |------|----------|
 | `rust/crates/mnote-web/` | Rust web gateway (axum + Leptos SSR, `:3000`) |
 | `rust/crates/mnote-web/browser/` | Browser runtime modules for sidebar, filetree, document adapter, tree shell, Page AI panel host |
+| `rust/crates/mnote-web/src/routes/knowledge_rag.rs` | MNote LightRAG connector routes: status, ingest, query, delete, prune, open-reference |
+| `rust/crates/mnote-web/src/hermes_tools/knowledge_rag.rs` | Hermes / Reasonix-facing knowledge RAG tool facade |
 | `rust/crates/core-protocol/` | Kernel types, projection protocol, tree/graph terms |
 | `rust/crates/bridge-runtime/` | Kernel query/command, projection bridge, source normalization |
 | `rust/spikes/leptos-tiptap-spike/src/editor_runtime/` | Leptos-tiptap island runtime modules; use before editing root `lib.rs` |
@@ -80,6 +83,7 @@
 - **Rust workspace**: edition 2021, resolver "2", MIT license. All crates inherit workspace version (`rust/Cargo.toml:2-8`).
 - **Convex boundary**: root `convex/` has been retired to `recycle/20260522-convex-runtime-retirement/convex/`; `infra/convex/` has been retired to `recycle/20260522-convex-runtime-retirement/infra/convex/`; do not recreate either as an active deploy source without a new architecture decision. `recycle/wolai-frontend/convex` is also historical. Keep Rust `transport/convex.rs` and `storage-convex-bridge` as explicit cloud/compat boundaries; do not mechanically delete them with the retired functions source.
 - **AI editing path**: local-first Markdown editing should prefer `currentFile + selection + allowedRoots / aiAccessScope + agent native patch/diff + watcher sync`. `mnote.doc.*` / `mnote.block.*` are cloud, remote, compat, or complex-structure helpers.
+- **Knowledge RAG path**: use `mnote.knowledge_rag.status/query/open_reference` and `/api/knowledge-rag/*`. Do not use `mnote.evidence.*`, LiteParse, or local OCR sidecar as the default retrieval/indexing path. Image sources enter LightRAG through a Markdown wrapper; MNote status bridge/backoff syncs LightRAG background completion back to the registry and FileTree.
 - **Bug tracking**: bugs organized by design domain directory (e.g. `bugs/04-tree-domain/process/`), moved to `done/` when fixed (`bugs/README.md`).
 - **Design docs**: organized by domain in `design/`, with `process/` (in-progress) and `done/` (completed) subdirs (`design/README.md`).
 
@@ -89,6 +93,7 @@
 - **`.aionrs/`, `.claw/`, `.codex/`, `.gemini/`** — session data from other AI tools, not project code. Don't read or edit.
 - **`recycle/`** — retired code, not current implementation. Don't use as evidence for current behavior.
 - **Convex availability**: local-folder / Rust projection smoke should not require Convex. Auth, share grants, ACP/Hermes runtime state, and AI policy default to SQLite control-plane; Convex is required only for tests that explicitly cover legacy cloud source, compat, sync replica, migration, or rollback behavior.
-- **MVP 后阶段优先级**: prefer WorkspacePath/ObjectIdentity runtime consumption, DocumentBuffer/BufferStore, Page Aggregate compat slimming, tree command context/context key, live cache unification, agent diff audit, conflict merge, local index, and share/sync productization.
+- **LightRAG boundary**: LightRAG storage is derived cache, not user source truth. MNote registry is the mapping authority for source path, doc id, stale/deleted state, FileTree lights, and citation routing.
+- **MVP 后阶段优先级**: prefer WorkspacePath/ObjectIdentity runtime consumption, DocumentBuffer/BufferStore, Page Aggregate compat slimming, tree command context/context key, live cache unification, agent diff audit, conflict merge, local lightweight search, and share/sync productization. Knowledge RAG belongs to LightRAG, not a revived local evidence/LiteParse index.
 - **Rust wasm32 target** required (`rust/rust-toolchain.toml`), needed for `tree-shell-runtime-wasm` crate.
 - **`rust/target/`** is gitignored and large — `cargo build` runs from scratch if cache is missing.