Add canonical lint set

content/wiki/canonical_lints.md

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++++
+title = "Canonical lint set for Linebender projects"
++++
+
+All Linebender projects should include the following set of lints in their `Cargo.toml`:
+
+```toml
+[lints]
+# This one may vary depending on the project.
+rust.unsafe_code = "forbid"
+
+# LINEBENDER LINT SET - v1
+# See https://linebender.org/wiki/canonical-lints/
+rust.keyword_idents_2024 = "forbid"
+rust.non_ascii_idents = "forbid"
+rust.non_local_definitions = "forbid"
+rust.unsafe_op_in_unsafe_fn = "forbid"
+
+rust.elided_lifetimes_in_paths = "warn"
+rust.let_underscore_drop = "warn"
+rust.missing_debug_implementations = "warn"
+rust.missing_docs = "warn"
+rust.single_use_lifetimes = "warn"
+rust.trivial_numeric_casts = "warn"
+rust.unexpected_cfgs = "warn"
+rust.unit_bindings = "warn"
+rust.unnameable_types = "warn"
+rust.unreachable_pub = "warn"
+rust.unused_import_braces = "warn"
+rust.unused_lifetimes = "warn"
+rust.unused_macro_rules = "warn"
+rust.unused_qualifications = "warn"
+rust.variant_size_differences = "warn"
+
+clippy.allow_attributes = "warn"
+clippy.allow_attributes_without_reason = "warn"
+clippy.cast_possible_truncation = "warn"
+clippy.collection_is_never_read = "warn"
+clippy.dbg_macro = "warn"
+clippy.debug_assert_with_mut_call = "warn"
+clippy.doc_markdown = "warn"
+clippy.exhaustive_enums = "warn"
+clippy.fn_to_numeric_cast_any = "forbid"
+clippy.infinite_loop = "warn"
+clippy.large_include_file = "warn"
+clippy.large_stack_arrays = "warn"
+clippy.match_same_arms = "warn"
+clippy.mismatching_type_param_order = "warn"
+clippy.missing_assert_message = "warn"
+clippy.missing_errors_doc = "warn"
+clippy.missing_fields_in_debug = "warn"
+clippy.missing_panics_doc = "warn"
+clippy.partial_pub_fields = "warn"
+clippy.return_self_not_must_use = "warn"
+clippy.same_functions_in_if_condition = "warn"
+clippy.semicolon_if_nothing_returned = "warn"
+clippy.shadow_unrelated = "warn"
+clippy.should_panic_without_expect = "warn"
+clippy.todo = "warn"
+clippy.unseparated_literal_suffix = "warn"
+clippy.use_self = "warn"
+clippy.wildcard_imports = "warn"
+
+clippy.cargo_common_metadata = "warn"
+clippy.negative_feature_names = "warn"
+clippy.redundant_feature_names = "warn"
+clippy.wildcard_dependencies = "warn"
+# END LINEBENDER LINT SET
+```
+
+And in their `lib.rs`:
+
+```rust
+// LINEBENDER LINT SET - v1
+// See https://linebender.org/wiki/canonical-lints/
+// These lints aren't included in Cargo.toml because they
+// shouldn't apply to examples and tests
+#![warn(unused_crate_dependencies)]
+#![warn(clippy::print_stdout, clippy::print_stderr)]
+```
+
+This is a curated list: Clippy has a *lot* of lints, and most of them are not included above.
+
+You may occasionally want to run `cargo clippy` with `clippy::pedantic` on your codebase, which will cast a very wide nets and catch a lot of very minor issues.
+The lint set above focuses on problems that either impact correctness or tend to snowball over time.
+
+The list above should be considered canonical.
+If you think a new lint should be added to Linebender projects, add it to this file in alphabetical order, then copy-paste the list across projects.
+
+To keep this process simple, avoid modifying this list in individual projects.
+If you want to add other per-project lints, add them above the list.
+If you want to remove a lint, `#![allow]` or `#![expect]` it at the crate root.