fix: add scoped error logging for lexer/parser errors

- Add std.log.scoped(.pugz) to template.zig and view_engine.zig
- Log detailed error info (code, line, column, message) when parsing fails
- Log template path context in ViewEngine on parse errors
- Remove debug print from lexer, use proper scoped logging instead
- Move benchmarks, docs, examples, playground, tests out of src/ to project root
- Update build.zig and documentation paths accordingly
- Bump version to 0.3.1

tests/check_list/auxiliary/1794-extends.pug

@@ -0,0 +1 @@
+block content

tests/check_list/auxiliary/1794-include.pug

@@ -0,0 +1,4 @@
+mixin test()
+  .test&attributes(attributes)
+ 
++test()

tests/check_list/auxiliary/blocks-in-blocks-layout.pug

@@ -0,0 +1,8 @@
+doctype html
+html
+  head
+    title Default title
+  body
+    block body
+      .container
+        block content

tests/check_list/auxiliary/dialog.pug

@@ -0,0 +1,6 @@
+
+extends window.pug
+
+block window-content
+  .dialog
+    block content

tests/check_list/auxiliary/empty-block.pug

@@ -0,0 +1,2 @@
+block test
+

tests/check_list/auxiliary/escapes.html

@@ -0,0 +1,3 @@
+<script>
+  console.log("foo\nbar")
+</script>

tests/check_list/auxiliary/extends-empty-block-1.pug

@@ -0,0 +1,5 @@
+extends empty-block.pug
+
+block test
+    div test1
+

tests/check_list/auxiliary/extends-empty-block-2.pug

@@ -0,0 +1,5 @@
+extends empty-block.pug
+
+block test
+    div test2
+

tests/check_list/auxiliary/extends-from-root.pug

@@ -0,0 +1,4 @@
+extends /auxiliary/layout.pug
+
+block content
+    include /auxiliary/include-from-root.pug

tests/check_list/auxiliary/extends-relative.pug

@@ -0,0 +1,4 @@
+extends ../../cases/auxiliary/layout
+
+block content
+    include ../../cases/auxiliary/include-from-root

tests/check_list/auxiliary/filter-in-include.pug

@@ -0,0 +1,8 @@
+html
+  head
+    style(type="text/css")
+      :less
+        @pad: 15px;
+        body {
+          padding: @pad;
+        }

tests/check_list/auxiliary/includable.js

@@ -0,0 +1,8 @@
+var STRING_SUBSTITUTIONS = {
+  // table of character substitutions
+  '\t': '\\t',
+  '\r': '\\r',
+  '\n': '\\n',
+  '"': '\\"',
+  '\\': '\\\\',
+};

tests/check_list/auxiliary/include-from-root.pug

@@ -0,0 +1 @@
+h1 hello

tests/check_list/auxiliary/inheritance.extend.mixin.block.pug

@@ -0,0 +1,11 @@
+mixin article()
+  article
+    block
+
+html
+  head
+    title My Application
+    block head
+  body
+    +article
+      block content

tests/check_list/auxiliary/inheritance.extend.recursive-grand-grandparent.pug

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+h1 grand-grandparent
+block grand-grandparent

tests/check_list/auxiliary/inheritance.extend.recursive-grandparent.pug

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+extends inheritance.extend.recursive-grand-grandparent.pug
+
+block grand-grandparent
+    h2 grandparent
+    block grandparent
+

tests/check_list/auxiliary/inheritance.extend.recursive-parent.pug

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+extends inheritance.extend.recursive-grandparent.pug
+
+block grandparent
+    h3 parent
+    block parent

tests/check_list/auxiliary/layout.include.pug

@@ -0,0 +1,7 @@
+html
+  head
+    title My Application
+    block head
+  body
+    block content
+    include window.pug

tests/check_list/auxiliary/layout.pug

@@ -0,0 +1,6 @@
+html
+  head
+    title My Application
+    block head
+  body
+    block content

tests/check_list/auxiliary/mixin-at-end-of-file.pug

@@ -0,0 +1,3 @@
+mixin slide
+  section.slide
+    block

tests/check_list/auxiliary/mixins.pug

@@ -0,0 +1,3 @@
+
+mixin foo()
+  p bar

tests/check_list/auxiliary/pet.pug

@@ -0,0 +1,3 @@
+.pet
+  h1 {{name}}
+  p {{name}} is a {{species}} that is {{age}} old

tests/check_list/auxiliary/smile.html

@@ -0,0 +1 @@
+<p>:)</p>

tests/check_list/auxiliary/window.pug

@@ -0,0 +1,4 @@
+
+.window
+  a(href='#').close Close
+  block window-content

tests/check_list/auxiliary/yield-nested.pug

@@ -0,0 +1,10 @@
+html
+  head
+    title
+  body
+    h1 Page
+    #content
+      #content-wrapper
+        yield
+    #footer
+      stuff