phase15: update CLAUDE.md and sync with current progress

- Update phase indicator to Phase 15 (Self-Hosting)
- Update documentation links to Phase 15 resources
- Reflect completion of R1-R5 tasks and ongoing work
- Fix CURRENT_TASK.md location to root directory

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

tools/ny_parser_bridge_smoke.ps1

@@ -0,0 +1,22 @@
+Param()
+$ErrorActionPreference = 'Stop'
+
+$root = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
+$bin = Join-Path $root 'target\release\nyash.exe'
+
+if (-not (Test-Path $bin)) {
+  Write-Host 'Building nyash (release)...'
+  cargo build --release --features cranelift-jit | Out-Null
+}
+
+Write-Host '[Smoke] Parser v0 JSON pipe → MIR-Interp'
+$json = '{"version":0,"kind":"Program","body":[{"type":"Return","expr":{"type":"Binary","op":"+","lhs":{"type":"Int","value":1},"rhs":{"type":"Binary","op":"*","lhs":{"type":"Int","value":2},"rhs":{"type":"Int","value":3}}}}]}'
+$pipeOut = $json | & $bin --ny-parser-pipe
+if ($pipeOut -match 'Result:') { Write-Host 'PASS: pipe path' } else { Write-Host 'FAIL: pipe path'; Write-Output $pipeOut; exit 1 }
+
+Write-Host '[Smoke] --json-file path'
+$tmp = New-TemporaryFile
+@'{"version":0,"kind":"Program","body":[{"type":"Return","expr":{"type":"Binary","op":"+","lhs":{"type":"Int","value":1},"rhs":{"type":"Binary","op":"*","lhs":{"type":"Int","value":2},"rhs":{"type":"Int","value":3}}}}]}'@ | Set-Content -Path $tmp -NoNewline
+$fileOut = & $bin --json-file $tmp
+if ($fileOut -match 'Result:') { Write-Host 'PASS: json-file path' } else { Write-Host 'FAIL: json-file path'; Write-Output $fileOut; exit 1 }
+Write-Host 'All PASS'