make.tcl projectversion: escape [X.Y.Z] in warning messages

The version-mismatch and missing-header warning branches interpolated the
literal [X.Y.Z] inside double-quoted puts strings, so Tcl attempted command
substitution and the check died with `invalid command name "X.Y.Z"` the
first time a warning branch actually fired (surfaced by a manual
projectversion check during the 0.4.2 bump, whose CHANGELOG entry was
missing at the time). Brackets now backslash-escaped. Layout copies of
make.tcl synced by the project build included.

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

src/make.tcl

@@ -1848,10 +1848,10 @@ if {$::punkboot::command eq "projectversion"} {
     if {![string length $pp_version]} {
         puts stderr "WARNING: could not read version from $pp_file"
     } elseif {![string length $cl_version]} {
-        puts stderr "WARNING: no '## [X.Y.Z]' version header found in $cl_file"
+        puts stderr "WARNING: no '## \[X.Y.Z\]' version header found in $cl_file"
     } elseif {$pp_version ne $cl_version} {
         puts stderr "WARNING: version mismatch — punkproject.toml=$pp_version but CHANGELOG.md=$cl_version"
-        puts stderr "  The latest '## [X.Y.Z]' header in CHANGELOG.md must match the version in punkproject.toml."
+        puts stderr "  The latest '## \[X.Y.Z\]' header in CHANGELOG.md must match the version in punkproject.toml."
     } else {
         puts stdout "consistency: OK (versions match)"
     }

src/project_layouts/custom/_project/punk.basic/src/make.tcl

@@ -1848,10 +1848,10 @@ if {$::punkboot::command eq "projectversion"} {
     if {![string length $pp_version]} {
         puts stderr "WARNING: could not read version from $pp_file"
     } elseif {![string length $cl_version]} {
-        puts stderr "WARNING: no '## [X.Y.Z]' version header found in $cl_file"
+        puts stderr "WARNING: no '## \[X.Y.Z\]' version header found in $cl_file"
     } elseif {$pp_version ne $cl_version} {
         puts stderr "WARNING: version mismatch — punkproject.toml=$pp_version but CHANGELOG.md=$cl_version"
-        puts stderr "  The latest '## [X.Y.Z]' header in CHANGELOG.md must match the version in punkproject.toml."
+        puts stderr "  The latest '## \[X.Y.Z\]' header in CHANGELOG.md must match the version in punkproject.toml."
     } else {
         puts stdout "consistency: OK (versions match)"
     }

src/project_layouts/custom/_project/punk.project-0.1/src/make.tcl

@@ -1848,10 +1848,10 @@ if {$::punkboot::command eq "projectversion"} {
     if {![string length $pp_version]} {
         puts stderr "WARNING: could not read version from $pp_file"
     } elseif {![string length $cl_version]} {
-        puts stderr "WARNING: no '## [X.Y.Z]' version header found in $cl_file"
+        puts stderr "WARNING: no '## \[X.Y.Z\]' version header found in $cl_file"
     } elseif {$pp_version ne $cl_version} {
         puts stderr "WARNING: version mismatch — punkproject.toml=$pp_version but CHANGELOG.md=$cl_version"
-        puts stderr "  The latest '## [X.Y.Z]' header in CHANGELOG.md must match the version in punkproject.toml."
+        puts stderr "  The latest '## \[X.Y.Z\]' header in CHANGELOG.md must match the version in punkproject.toml."
     } else {
         puts stdout "consistency: OK (versions match)"
     }

src/project_layouts/custom/_project/punk.shell-0.1/src/make.tcl

@@ -1848,10 +1848,10 @@ if {$::punkboot::command eq "projectversion"} {
     if {![string length $pp_version]} {
         puts stderr "WARNING: could not read version from $pp_file"
     } elseif {![string length $cl_version]} {
-        puts stderr "WARNING: no '## [X.Y.Z]' version header found in $cl_file"
+        puts stderr "WARNING: no '## \[X.Y.Z\]' version header found in $cl_file"
     } elseif {$pp_version ne $cl_version} {
         puts stderr "WARNING: version mismatch — punkproject.toml=$pp_version but CHANGELOG.md=$cl_version"
-        puts stderr "  The latest '## [X.Y.Z]' header in CHANGELOG.md must match the version in punkproject.toml."
+        puts stderr "  The latest '## \[X.Y.Z\]' header in CHANGELOG.md must match the version in punkproject.toml."
     } else {
         puts stdout "consistency: OK (versions match)"
     }