chore: update STATE.scm with LSP completion (60%)

Updated project state to reflect LSP server implementation:
- Overall completion: 50% → 60%
- Added LSP working features (server, VSCode extension, diagnostics)
- Documented session accomplishments (1200+ lines of LSP code)
- CLI tool now includes 'lsp' command
- Integration tests: 10/10 passing

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Test

STATE.scm

@@ -17,7 +17,7 @@
 
   (current-position
     (phase "tooling")
-    (overall-completion 50)
+    (overall-completion 60)
     (working-features
       ("Complete formal specification (SPEC.core.scm)")
       ("Lexer and parser (source → AST)")
@@ -30,7 +30,10 @@
       ("Demo scenarios and conformance tests")
       ("Syntax highlighting (VSCode, Vim, Emacs, Sublime)")
       ("Testing framework (TEST/SCENARIO/GIVEN/EXPECT DSL)")
-      ("CLI tool (run, parse, check, test, repl commands)")))
+      ("CLI tool (run, parse, check, test, lsp, repl commands)")
+      ("LSP server (JSON-RPC 2.0, auto-completion, hover, diagnostics)")
+      ("VSCode extension with full IDE support")
+      ("Go-to-definition for constants and policies")))
 
   (route-to-mvp
     (milestones
@@ -124,4 +127,26 @@
         "  - CLI integration: phronesis test <file>"
         "  - Example BGP security test suite"
         "  - Pass/fail reporting with verbose mode"
-        "Project completion: 25% → 50%")))))
+        "Implemented LSP server (1200+ lines)"
+        "  - JSON-RPC 2.0 protocol over stdin/stdout"
+        "  - Document synchronization (incremental updates)"
+        "  - Auto-completion (keywords, stdlib modules, functions)"
+        "  - Hover documentation in markdown format"
+        "  - Go-to-definition for constants and policies"
+        "  - Real-time diagnostics (lexer/parser errors)"
+        "  - Server/Server.ex, TextDocument.ex, Completion.ex, Hover.ex, Definition.ex"
+        "VSCode extension (full IDE integration)"
+        "  - LSP client with proper configuration"
+        "  - Syntax highlighting via TextMate grammar"
+        "  - Auto-completion with snippets"
+        "  - Hover documentation on keywords/functions"
+        "  - Document formatting support"
+        "  - Language configuration (brackets, comments)"
+        "Integration testing suite (10 tests, all passing)"
+        "  - TextDocument management and word extraction"
+        "  - Completion engine verification"
+        "  - Hover and definition handling"
+        "  - Parsing and diagnostics validation"
+        "Added Jason dependency for JSON-RPC"
+        "CLI tool extended with 'lsp' command"
+        "Project completion: 25% → 50% → 60%")))))