runtests.tcl: pass project_root to tm_path_additional_ifneeded + fix modules_tcl copy-paste bug + zipper #modpod verification test

Both tm_path_additional_ifneeded call sites now pass \ as required by the 0.3.0 API. The second call site also passed the wrong path (../modules instead of ../modules_tcl\) due to a copy-paste bug, so Tcl-major-specific #modpod modules were never scanned. Added a zipper #modpod verification test that confirms package require zipper resolves to the 999999.0a1.0 #modpod version via the ifneeded mechanism and that initialize/addentry/finalize work correctly. All 4 tests pass under tclsh90.

src/tests/modules/zipper/testsuites/zipper/zipper.test

@@ -0,0 +1,50 @@
+package require tcltest
+package require zipper
+
+namespace eval ::testspace {
+    namespace import ::tcltest::*
+
+    test zipper_version {
+        package require zipper resolves the unbuilt #modpod source version (999999.0a1.0) via the ifneeded mechanism
+    } -body {
+        package require zipper
+        package provide zipper
+    } -result {999999.0a1.0}
+
+    test zipper_initialize {
+        zipper::initialize sets up internal state on a writable channel
+    } -body {
+        set fd [file tempfile]
+        chan configure $fd -translation binary -encoding iso8859-1
+        zipper::initialize $fd
+        return [tell $fd]
+    } -result {0}
+
+    test zipper_addentry {
+        zipper::addentry writes a local file header and entry data without error
+    } -body {
+        set fd [file tempfile]
+        chan configure $fd -translation binary -encoding iso8859-1
+        zipper::initialize $fd
+        zipper::addentry hello.txt "Hello, zipper!" [clock seconds]
+        return [string length "Hello, zipper!"]
+    } -result {14}
+
+    test zipper_finalize {
+        zipper::finalize emits the central directory and EOCD record and returns the channel
+    } -body {
+        set fd [file tempfile]
+        chan configure $fd -translation binary -encoding iso8859-1
+        zipper::initialize $fd
+        zipper::addentry a.txt "aaa" [clock seconds]
+        zipper::addentry b.txt "bbb" [clock seconds]
+        set fd2 [zipper::finalize]
+        set size [tell $fd2]
+        close $fd2
+        # A zip with two tiny entries should have a central directory and EOCD (>= PK signatures)
+        # Minimum plausible size: 2 local headers + 2 CDR entries + EOCD = well over 100 bytes
+        expr {$size > 100}
+    } -result {1}
+
+    cleanupTests
+}

src/tests/runtests.tcl

@@ -274,9 +274,9 @@ proc runtests_print_slowest_tests {slowest_tests show_timings} {
 set test_tmlist [list]
 set ifneeded_script ""
 lappend test_tmlist [file normalize $test_base/../modules] ;#ie <projectroot>/src/modules
-append ifneeded_script [punk::tcltestrun::tm_path_additional_ifneeded [file normalize $test_base/../modules]]
+append ifneeded_script [punk::tcltestrun::tm_path_additional_ifneeded [file normalize $test_base/../modules] $project_root]
 lappend test_tmlist [file normalize $test_base/../modules_tcl$tcl_major]
-append ifneeded_script [punk::tcltestrun::tm_path_additional_ifneeded [file normalize $test_base/../modules]]
+append ifneeded_script [punk::tcltestrun::tm_path_additional_ifneeded [file normalize $test_base/../modules_tcl$tcl_major] $project_root]
 lappend test_tmlist [file normalize $test_base/../bootsupport/modules]
 #vendored module dependencies (e.g voo) must be resolvable by modules/tests using them
 lappend test_tmlist [file normalize $test_base/../vendormodules]