Chore: Modernize repository and migrate default branch to main

.editorconfig

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+# EditorConfig: https://editorconfig.org
+# Applied by Visual Studio, VS Code, Rider, and `dotnet format`.
+
+root = true
+
+# -----------------------------
+# All files
+# -----------------------------
+[*]
+charset = utf-8
+end_of_line = crlf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+# -----------------------------
+# Markdown
+# -----------------------------
+[*.md]
+trim_trailing_whitespace = false
+
+# -----------------------------
+# YAML / GitHub Actions
+# -----------------------------
+[*.{yml,yaml}]
+indent_size = 2
+
+# -----------------------------
+# JSON
+# -----------------------------
+[*.json]
+indent_size = 2
+
+# -----------------------------
+# XML / MSBuild project files
+# -----------------------------
+[*.{xml,config,props,targets,nuspec,resx,ruleset,vsixmanifest,vsct}]
+indent_style = tab
+indent_size = 4
+
+[*.{csproj,vbproj,vcxproj,vcxproj.filters,proj,projitems,shproj}]
+indent_style = tab
+indent_size = 4
+
+[*.{sln,DotSettings}]
+indent_style = tab
+indent_size = 4
+
+# -----------------------------
+# Shell / scripts
+# -----------------------------
+[*.{sh,ps1,cmd,bat}]
+end_of_line = lf
+indent_size = 2
+
+[*.{cmd,bat,ps1}]
+end_of_line = crlf
+
+# -----------------------------
+# C# source
+# -----------------------------
+[*.cs]
+indent_style = space
+indent_size = 4
+
+#### .NET coding conventions ####
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+# this. / Me. preferences
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# Language keywords vs BCL types
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
+dotnet_style_readonly_field = true:suggestion
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary:silent
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:silent
+dotnet_style_prefer_conditional_expression_over_return = true:silent
+dotnet_style_prefer_compound_assignment = true:suggestion
+dotnet_style_prefer_simplified_interpolation = true:suggestion
+dotnet_style_prefer_simplified_boolean_expressions = true:suggestion
+dotnet_style_namespace_match_folder = true:suggestion
+
+# Null checking
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+dotnet_style_prefer_null_check_over_type_check = true:suggestion
+
+# Parameter preferences
+dotnet_code_quality_unused_parameters = all:suggestion
+
+# Suppression
+dotnet_remove_unnecessary_suppression_exclusions = none
+
+#### C# coding conventions ####
+# var preferences — prefer explicit types (matches existing sample style)
+csharp_style_var_for_built_in_types = false:suggestion
+csharp_style_var_when_type_is_apparent = false:suggestion
+csharp_style_var_elsewhere = false:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = false:silent
+csharp_style_expression_bodied_constructors = false:silent
+csharp_style_expression_bodied_operators = false:silent
+csharp_style_expression_bodied_properties = true:silent
+csharp_style_expression_bodied_indexers = true:silent
+csharp_style_expression_bodied_accessors = true:silent
+csharp_style_expression_bodied_lambdas = true:silent
+csharp_style_expression_bodied_local_functions = false:silent
+
+# Pattern matching
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_prefer_switch_expression = true:suggestion
+csharp_style_prefer_pattern_matching = true:silent
+csharp_style_prefer_not_pattern = true:suggestion
+csharp_style_prefer_extended_property_pattern = true:suggestion
+
+# Null checking
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Modifier preferences
+csharp_prefer_static_local_function = true:suggestion
+csharp_preferred_modifier_order = public,private,protected,internal,file,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,required,volatile,async:silent
+csharp_style_prefer_readonly_struct = true:suggestion
+csharp_style_prefer_readonly_struct_member = true:suggestion
+
+# Code-block preferences (Allman / new-line braces — matches this repo)
+csharp_prefer_braces = true:suggestion
+csharp_prefer_simple_using_statement = true:suggestion
+csharp_style_namespace_declarations = block_scoped:suggestion
+csharp_style_prefer_method_group_conversion = true:silent
+csharp_style_prefer_top_level_statements = false:suggestion
+csharp_style_prefer_primary_constructors = false:suggestion
+
+# Expression-level preferences
+csharp_prefer_simple_default_expression = true:suggestion
+csharp_style_deconstructed_variable_declaration = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+csharp_style_prefer_index_operator = true:suggestion
+csharp_style_prefer_range_operator = true:suggestion
+csharp_style_prefer_local_over_anonymous_function = true:suggestion
+csharp_style_prefer_tuple_swap = true:suggestion
+csharp_style_prefer_utf8_string_literals = true:suggestion
+csharp_style_implicit_object_creation_when_type_is_apparent = true:suggestion
+csharp_style_prefer_null_check_over_type_check = true:suggestion
+
+# 'using' directive preferences
+csharp_using_directive_placement = outside_namespace:suggestion
+
+# whether to prefer new() without type when type is apparent
+dotnet_style_prefer_collection_expression = when_types_exactly_match:suggestion
+
+#### C# formatting rules ####
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = one_less_than_current
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents_when_block = true
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_after_comma = true
+csharp_space_before_comma = false
+csharp_space_after_dot = false
+csharp_space_before_dot = false
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_around_declaration_statements = false
+csharp_space_before_open_square_brackets = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_square_brackets = false
+
+# Wrapping preferences
+csharp_preserve_single_line_statements = true
+csharp_preserve_single_line_blocks = true
+
+#### Naming conventions ####
+dotnet_naming_style.pascal_case_style.capitalization = pascal_case
+dotnet_naming_style.camel_case_style.capitalization = camel_case
+dotnet_naming_style.i_prefix_style.required_prefix = I
+dotnet_naming_style.i_prefix_style.capitalization = pascal_case
+dotnet_naming_style.underscore_camel_case.required_prefix = _
+dotnet_naming_style.underscore_camel_case.capitalization = camel_case
+
+# Interfaces: IPascalCase
+dotnet_naming_rule.interface_should_be_begins_with_i.severity = true
+dotnet_naming_rule.interface_should_be_begins_with_i.symbols = interface_symbols
+dotnet_naming_rule.interface_should_be_begins_with_i.style = i_prefix_style
+dotnet_naming_symbols.interface_symbols.applicable_kinds = interface
+dotnet_naming_symbols.interface_symbols.applicable_accessibilities = *
+dotnet_naming_symbols.interface_symbols.required_modifiers =
+
+# Types / non-field members: PascalCase
+dotnet_naming_rule.types_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.types_should_be_pascal_case.symbols = types_and_namespaces
+dotnet_naming_rule.types_should_be_pascal_case.style = pascal_case_style
+dotnet_naming_symbols.types_and_namespaces.applicable_kinds = class,struct,interface,enum,delegate,namespace
+dotnet_naming_symbols.types_and_namespaces.applicable_accessibilities = *
+
+dotnet_naming_rule.non_field_members_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.non_field_members_should_be_pascal_case.symbols = non_field_members
+dotnet_naming_rule.non_field_members_should_be_pascal_case.style = pascal_case_style
+dotnet_naming_symbols.non_field_members.applicable_kinds = property,event,method
+dotnet_naming_symbols.non_field_members.applicable_accessibilities = *
+
+# Constants: PascalCase
+dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.constant_fields_should_be_pascal_case.symbols = constant_fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.style = pascal_case_style
+dotnet_naming_symbols.constant_fields.applicable_kinds = field
+dotnet_naming_symbols.constant_fields.applicable_accessibilities = *
+dotnet_naming_symbols.constant_fields.required_modifiers = const
+
+# Private / internal instance fields: _camelCase
+dotnet_naming_rule.private_fields_should_be_underscore_camel.severity = suggestion
+dotnet_naming_rule.private_fields_should_be_underscore_camel.symbols = private_fields
+dotnet_naming_rule.private_fields_should_be_underscore_camel.style = underscore_camel_case
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private,private_protected,protected,internal,protected_internal
+dotnet_naming_symbols.private_fields.required_modifiers =
+
+# Static fields (non-const): PascalCase
+dotnet_naming_rule.static_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.static_fields_should_be_pascal_case.symbols = static_fields
+dotnet_naming_rule.static_fields_should_be_pascal_case.style = pascal_case_style
+dotnet_naming_symbols.static_fields.applicable_kinds = field
+dotnet_naming_symbols.static_fields.applicable_accessibilities = *
+dotnet_naming_symbols.static_fields.required_modifiers = static
+
+# Local variables / parameters: camelCase
+dotnet_naming_rule.locals_should_be_camel_case.severity = suggestion
+dotnet_naming_rule.locals_should_be_camel_case.symbols = locals_and_parameters
+dotnet_naming_rule.locals_should_be_camel_case.style = camel_case_style
+dotnet_naming_symbols.locals_and_parameters.applicable_kinds = parameter,local
+dotnet_naming_symbols.locals_and_parameters.applicable_accessibilities = *

.github/CODEOWNERS

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+# Default owners for code review requests
+* @VAllens

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a problem with the crawler sample
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for filing a bug. Please include enough detail to reproduce the issue.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What happened?
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to reproduce
+      description: Exact commands / actions
+      value: |
+        1.
+        2.
+        3.
+    validations:
+      required: true
+  - type: input
+    id: sdk
+    attributes:
+      label: .NET SDK version
+      placeholder: e.g. 10.0.302
+    validations:
+      required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: OS
+      options:
+        - Windows
+        - Linux
+        - macOS
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / exception
+      render: shell

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement to the sample
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / motivation
+      description: What problem would this solve for learners or maintainers?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed change
+      description: Describe the API / docs / sample change you want
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+      description: Optional

.github/codex/prompts/review.md

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+# Codex PR review rubric
+
+When reviewing a pull request in this repository, focus on:
+
+- Correctness bugs and exception paths
+- Browser / page resource leaks
+- Fragile HTML selectors and scraping breakage risks
+- Security issues (secrets, unsafe deserialization, SSRF-like fetches)
+- Missing docs / CI updates when runtime or packages change
+
+Be concise and specific. Prefer actionable findings with file paths.
+Keep feedback proportional to the size of the PR.

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: nuget
+    directory: /src/CrawlerSamples.ConsoleApp
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 5
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 5