bootsupport: punk 0.2.6 -> 0.2.7 (help platforms topic)

Re-vendor the punk bootsupport module to pick up the canonical
punkshell platform-names work from the dev module: the 'help platforms'
topic (punk::args-documented table of punk::platform::platforms with
status, tiers, buildsuite axis and local-platform markers).

Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com

src/bootsupport/modules/punk-0.2.7.tm

@@ -8983,10 +8983,77 @@ namespace eval punk {
             return $chunks
         }
 
-        register topics  {help}          "List help topics"
-        register tcl     {}              "Tcl version warnings"
-        register env     {environment}   "punkshell environment vars"
-        register console {term terminal} "Some console behaviour tests and warnings"
+        punk::args::define {
+            @id -id ::punk::helptopic::platforms
+            @cmd -name "help platforms"\
+                -summary\
+                "Canonical punkshell platform names."\
+                -help\
+                "Show the canonical punkshell platform-dir names
+                (punk::platform::platforms) with status, the artifact-tree
+                tiers each name serves, and the buildsuite axis (whether the
+                punkshell zig buildsuites produce runtimes for the platform -
+                separate from hosting: punkbin-structured repos can carry
+                runtimes built by any mechanism), marking the running
+                interpreter's own platform. These names organize the punkbin
+                artifact repo's platform folders, bin/runtime/<platform>/
+                (punk-runtime fetch/list/use -platform), the lib_tclX /
+                vendorlib_tclX auto_path dirs wired by the boot, and the
+                runtime-artifact metadata target field. The raw Tcl
+                platform-package identifiers are shown for comparison
+                (punk::platform::normalize folds their version-dependent
+                aliases - amd64/aarch64/macos - into the canonical names)."
+            @values -min 0 -max 0
+        }
+        proc platforms {context args} {
+            if {[catch {package require punk::platform} errM]} {
+                return [list [list stderr "help platforms: punk::platform package not available ($errM)\n"]]
+            }
+            set frametype [dict get $context frametype]
+            set chunks [list]
+            set local_lib     [punk::platform::local -tier lib]
+            set local_runtime [punk::platform::local -tier runtime]
+            set title "[a+ brightgreen] Canonical punkshell platform names: "
+            set t [textblock::class::table new -show_seps 0]
+            $t configure -frametype $frametype
+            $t add_column -headers [list "Platform"]
+            $t add_column -headers [list "Status"]
+            $t add_column -headers [list "Tiers"]
+            $t add_column -headers [list "Buildsuite"]
+            $t add_column -headers [list "Notes"]
+            dict for {p pinfo} [punk::platform::platforms] {
+                set pshown $p
+                if {$p eq $local_lib || $p eq $local_runtime} {
+                    set pshown "* $p"
+                }
+                $t add_row [list $pshown [dict get $pinfo status] [join [dict get $pinfo tiers] ,] [dict get $pinfo buildsuite] [dict get $pinfo notes]]
+            }
+            foreach c {0 1 2 3} {
+                $t configure_column $c -minwidth [expr {[$t column_datawidth $c] + 2}]
+            }
+            $t configure -title $title
+            set text [$t print]
+            $t destroy
+            lappend chunks [list stdout $text]
+            set detail "* = this interpreter.  local: lib-tier $local_lib"
+            if {$local_runtime ne $local_lib} {
+                append detail "  runtime-tier $local_runtime"
+            }
+            append detail "\ntiers: runtime = punkbin + bin/runtime folders; lib = lib_tclX/vendorlib_tclX auto_path dirs"
+            append detail "\nbuildsuite: whether the punkshell zig buildsuites produce runtimes for the platform"
+            append detail "\n(a separate axis - punkbin-structured repos can host runtimes built by any mechanism)"
+            catch {
+                append detail "\nraw Tcl platform package ([package present platform]): generic [platform::generic]  identify [platform::identify]"
+            }
+            lappend chunks [list stdout $detail\n]
+            return $chunks
+        }
+
+        register topics    {help}            "List help topics"
+        register tcl       {}                "Tcl version warnings"
+        register env       {environment}     "punkshell environment vars"
+        register console   {term terminal}   "Some console behaviour tests and warnings"
+        register platforms {platform}        "Canonical punkshell platform names"
     }
 
     #return list of {chan chunk} elements
@@ -9438,7 +9505,7 @@ punkcheck::cli set_alias punkcheck
 package provide punk [namespace eval punk {
     #FUNCTL
     variable version
-    set version 0.2.6
+    set version 0.2.7
 }]