feat: csharp support

Cargo.toml

@@ -72,6 +72,7 @@ tree-sitter-typescript = "0.23"
 tree-sitter-python = "0.25"
 tree-sitter-rust = "0.24"
 tree-sitter-java = "0.23"
+tree-sitter-c-sharp = "0.23"
 tree-sitter-bash = "0.25"
 tree-sitter-ruby = "0.23"
 tree-sitter-php = "0.24"

README.md

@@ -177,7 +177,7 @@ graph LR
 - **MCP Server** -- Expose graph via MCP protocol for AI tool integration (40 tools)
 - **Orchestration** -- Smart context routing with caching via natural language intent
 - **Community Detection** -- Auto-detect functional clusters in your codebase
-- **Multi-Language** -- Index Go, TypeScript, Python, Rust, Java, Kotlin, Ruby, PHP, Perl, R, Elixir, Bash with tree-sitter
+- **Multi-Language** -- Default source discovery currently covers Go, TypeScript, Python, Rust, Java, Kotlin, and C#; additional parser modules also exist for Bash, Ruby, PHP, Perl, R, and Elixir
 - **Android** -- Extract XML layouts, resources, manifest relationships, and navigation graphs
 - **Service Topology** -- Microservice call graph visualization
 - **Annotation Search** -- Search code by `@Entity`, `@HiltViewModel`, and other annotations

docs/design/hld-leankg.md

@@ -1,10 +1,15 @@
 # LeanKG High Level Design
 
-**Phien ban:** 1.22
+**Phien ban:** 1.22.1
 **Ngay:** 2026-04-24
-**Dua tren:** PRD v1.22
+**Dua tren:** PRD v1.22.1
 **Trang thai:** Ban nhap
 **Changelog:**
+- v1.22.1 - C# Source Indexing MVP:
+  - Add parser support for `.cs` files via tree-sitter-c-sharp
+  - Use shared language registration across bulk and single-file indexing paths
+  - Add C# entity, import, inheritance, and basic call extraction
+  - Parse tests with the normal C# parser and classify them heuristically
 - v1.23 - Knowns-Inspired Enhancements (FUTURE):
   - Hybrid search with Reciprocal Rank Fusion (semantic + keyword)
   - Reference system (`@doc/`, `@task-` syntax) for traversable links
@@ -463,6 +468,7 @@ graph TB
 | Go Parser | Parse Go source files |
 | TS/JS Parser | Parse TypeScript/JavaScript files |
 | Python Parser | Parse Python files |
+| C# Parser | Parse C# source files |
 | Ruby Parser | Parse Ruby files |
 | PHP Parser | Parse PHP files |
 | Perl Parser | Parse Perl files |
@@ -1220,6 +1226,7 @@ project:
     - go
     - typescript
     - python
+    - csharp
 
 indexer:
   exclude:
@@ -1230,6 +1237,7 @@ indexer:
     - "*.go"
     - "*.ts"
     - "*.py"
+    - "*.cs"
 
 pipeline:
   enabled: true
@@ -1420,7 +1428,7 @@ Knowns MCP tools: tasks, docs, search, code, memory, validation
   - postinstall script handles binary extraction and PATH setup
   - Works without Rust toolchain on developer machine
 - Web UI improvements
-- Additional language support (Rust, Java, C#)
+- Additional language support (Rust, Java)
 - Incremental indexing optimization
 
 ### 11.2 Phase 3 Features
@@ -1496,4 +1504,4 @@ Knowns MCP tools: tasks, docs, search, code, memory, validation
 - CozoDB: https://github.com/cozodb/cozo (Embedded relational-graph database with Datalog queries)
 - tree-sitter: https://tree-sitter.github.io/tree-sitter/
 - MCP Protocol: https://modelcontextprotocol.io/
-- code-review-graph: https://github.com/tirth8205/code-review-graph (inspiration for impact analysis)
+- code-review-graph: https://github.com/tirth8205/code-review-graph (inspiration for impact analysis)

docs/requirement/prd-leankg.md

@@ -15,7 +15,27 @@
 - Source 2: `prd-leankg-v2.0-enhancements.md` (v2.0, 2026-03-27)
 - Source 3: `prd-leankg-gitnexus-enhancements.md` (v1.0, 2026-03-27)
 
-<<<<<<< HEAD
+### v1.22.1 (IN PROGRESS) - C# Source Indexing MVP
+- Add `.cs` source indexing via tree-sitter-c-sharp
+- Parse both production and test `.cs` files with the same parser
+- Add heuristic test classification for `*Test.cs` and `*Tests.cs`
+- Reuse existing element and relationship types
+- Non-goals: `.csproj`, `.sln`, namespace-qualified symbol identities, framework-aware test semantics
+
+### v1.22 (IN PROGRESS) - MCP HTTP Transport (Remote MCP Server)
+- **US-22.1:** Add `mcp-http` CLI command for HTTP-based MCP server
+- **US-22.2:** Implement Streamable HTTP transport per MCP spec (HTTP POST + SSE)
+- **US-22.3:** Support multiple concurrent MCP clients (vs stdio's single client)
+- **US-22.4:** Bearer token authentication for HTTP endpoint
+- **US-22.5:** CORS headers for browser-based MCP clients
+- **Worktree:** `.worktrees/feat/mcp-http`
+
+**MCP Transport Modes:**
+| Mode | Transport | Use Case | Max Clients |
+|------|-----------|----------|-------------|
+| `mcp-stdio` | stdin/stdout | Local AI tools (Cursor, Claude Code) | 1 |
+| `mcp-http` | HTTP + SSE | Remote access, browser clients | Many |
+
 ### v1.21 (IN PROGRESS) - CPU Optimization
 - **US-21.1:** Reduce idle CPU from 61% to <5%
 - **US-21.2:** Cache TTL tuning (300s→60s, max entries 1000→100) - COMPLETED
@@ -37,20 +57,6 @@
 - **Analysis Document:** `docs/design/cpu-optimization.md`
 - **Worktree:** `.worktrees/feat/cpu-optimization`
 
-### v1.22 (IN PROGRESS) - MCP HTTP Transport (Remote MCP Server)
-- **US-22.1:** Add `mcp-http` CLI command for HTTP-based MCP server
-- **US-22.2:** Implement Streamable HTTP transport per MCP spec (HTTP POST + SSE)
-- **US-22.3:** Support multiple concurrent MCP clients (vs stdio's single client)
-- **US-22.4:** Bearer token authentication for HTTP endpoint
-- **US-22.5:** CORS headers for browser-based MCP clients
-- **Worktree:** `.worktrees/feat/mcp-http`
-
-**MCP Transport Modes:**
-| Mode | Transport | Use Case | Max Clients |
-|------|-----------|----------|-------------|
-| `mcp-stdio` | stdin/stdout | Local AI tools (Cursor, Claude Code) | 1 |
-| `mcp-http` | HTTP + SSE | Remote access, browser clients | Many |
-
 ### v1.20 (PENDING) - MCP Server Watch Mode
 - **US-20.1:** Add `--watch` flag to MCP server for auto-indexing on file changes
 - **US-20.2:** Port 8081→9699 consolidation
@@ -485,7 +491,7 @@ The following features are explicitly out of scope:
 4. **Advanced authentication** - Local token only
 5. **Plugin system** - Future consideration
 6. **Enterprise integrations** - Future consideration
-7. **14 language support** - MVP focused: Go, TS/JS, Python, Rust
+7. **Broad language-parity expansion** - Full multi-language parity beyond the MVP is out of scope; the approved MVP remains focused on Go, TS/JS, Python, Rust, plus `.cs` source indexing
 8. **Browser-based WebAssembly UI** - LeanKG targets CLI + MCP use case
 9. **Symbol rename tool** - High complexity; better handled by AI agent
 10. **Raw Datalog query passthrough** - Security risk