better debug support

scripts/build_psyq.ps1

@@ -321,11 +321,12 @@ function ps1-meta { param(
 		[Parameter(Mandatory=$true)][string[]]$sources,
 		[Parameter(Mandatory=$true)][string]$metadata,
 		[string]$out_root = (join-path $path_build 'gen'),
-		[string[]]$passes = @('--all')
+		[string[]]$passes = @('--all'),
+		[string[]]$extra_args = @()
 	)
 	$script = join-path $path_scripts 'ps1_meta.lua'
 	write-host "ps1-meta  $($sources.Count) source(s), passes=$($passes -join ',')" ` -ForegroundColor Magenta
-	$arg_list = @($passes) + @('--metadata', $metadata) + @('--out-root', $out_root)
+	$arg_list = @($passes) + @('--metadata', $metadata) + @('--out-root', $out_root) + @($extra_args)
 	foreach ($s in $sources) { $arg_list += @('--source', $s) }
 	& luajit $script @arg_list
 	if ($LASTEXITCODE -ne 0) {
@@ -383,6 +384,16 @@ function build-gte_hello {
 	)
 	link-modules $link_modules $elf $link_args
 	make-binary $elf $exe
+
+	# Post-link: emit ONLY build/gen/gdb_tape_atoms_runtime.gdb. The per-source
+	# *.atoms.sourcemap.txt was already generated by the pre-link --all call,
+	# so we skip --atoms-source-map here to avoid re-doing the work. The
+	# gdb-runtime emission requires --elf (for nm-based address lookup) so it
+	# MUST happen post-link. ON by default per user pref 2026-07-11.
+	ps1-meta -sources $atom_sources -metadata $path_atom_metadata `
+		-out_root (join-path $path_build 'gen') `
+		-passes @('--gdb-runtime') `
+		-extra_args @('--elf', $elf)
 }
 build-gte_hello