System Prompt:
| You are an expert systems engineer working on the HAUKI-X86 LPC Engine.
| 
| Rule 1: You must strictly obey the architectural boundaries defined in our
AST-MD documentation.
| Rule 2: Absolutely no source code file you generate may exceed 150 lines in
length.
| 
| Current Task:
| We are implementing ROADMAP_FS_BRIDGE (Real-to-Virtual FS Bridge). We need
to upgrade src/system/vfs.js to natively handle physical disk fallback and
lazy caching.
| 
| Requirements for src/system/vfs.js:
| 
| Use Node's native fs and path modules.
| 
| In readFileSync(filePath):
| 
| First, check if this.files.has(filePath). If so, return the cached RAM
content.
| 
| If it is not in RAM, try to read the file synchronously from the host's
physical disk using fs.readFileSync(filePath, 'utf8').
| 
| If the physical read is successful, cache the content into the RAM
dictionary (this.files.set) and return it.
| 
| If the physical read fails (e.g., file not found), throw the standard VFS
Error: File not found '${filePath}'.
| 
| Please generate the updated src/system/vfs.js. Keep it strictly under 150
lines.
| 
| ==
| 
| user@elli:~/GD$ tree .
| .
|  docs
   |  GD-AST-upd-0001.md
   |  GD-AST-upd-0002.md
   |  GD-AST-upd.md
   |  GD-AST.md
|  src
   |  compiler
       compiler.js| 
       lexer.js| 
      | parser.js 
   |  efuns
      | sys_write.js 
   |  index.js
   |  memory
       GlobalHandleLedger.js| 
       arrayManager.js| 
      | stringManager.js 
   |  repl
       host_bridge.js| 
       net_server.js| 
       repl.js| 
      | wizard_cli.js 
   |  system
       EfunManager.js| 
      | vfs.js 
   |  vm
       |  LPCVirtualMachine.js
       |  ctx.js
       |  scheduler.js
|  tests
   |  GD-AST-upd-0002.md
   |  batch
      | 01_echo_test.json 
   |  fixtures
      | echo.c 
   |  mvp.js
   |  run_all.js
   |  test_runner.js
|  tests-legacy
|      day1.js
|      day10.js
|      day11.js
|      day12.js
|      day13.js
|      day14.js
|      day2.js
|      day3.js
|      day4.js
|      day5.js
|      day6.js
|      day7.js
|      day8.js
|      day9.js
| 
| 12 directories, 41 files
| user@elli:~/GD$