docs: the repository of its own: licences, CI, citations checked in form (P13 step 6)

spec/ and examples/ are CC BY 4.0, the code MIT OR Apache-2.0. The
verbatim-pin and rules.md-id checks need wanderbooks' vendored sources and
rules.md, so they move to wanderbooks; here a citation is checked in form.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

checker/tests/spec.rs

@@ -11,10 +11,6 @@ fn spec_dir() -> PathBuf {
     Path::new(env!("CARGO_MANIFEST_DIR")).join("../spec")
 }
 
-fn sources_dir() -> PathBuf {
-    Path::new(env!("CARGO_MANIFEST_DIR")).join("../../docs/spec/sources")
-}
-
 /// A rule's section as the text gives it.
 #[derive(Default, Debug)]
 struct Section {
@@ -86,15 +82,6 @@ fn one<'a>(s: &'a Section, id: &str, field: &str) -> &'a str {
     &v[0]
 }
 
-/// Whitespace and typographic quotes made plain, so a pin copied from a
-/// wrapped or curly-quoted source still matches.
-fn squash(s: &str) -> String {
-    let plain = s
-        .replace(['\u{2019}', '\u{2018}'], "'")
-        .replace(['\u{201c}', '\u{201d}'], "\"");
-    plain.split_whitespace().collect::<Vec<_>>().join(" ")
-}
-
 fn backticked(s: &str) -> Vec<&str> {
     s.split('`').skip(1).step_by(2).collect()
 }
@@ -178,8 +165,9 @@ fn the_examples_are_the_catalogues() {
     }
 }
 
-/// Every citation resolves: a vendored source exists, and a verbatim
-/// pin appears in it; an external reference names its paragraph.
+/// Every citation is well formed: a vendored source names its file and a
+/// pin (checked verbatim by the consumer); an external reference names its
+/// paragraph.
 #[test]
 fn every_citation_resolves() {
     let sections = sections();
@@ -203,15 +191,14 @@ fn every_citation_resolves() {
                 let (file, rest) = rest
                     .split_once("`:")
                     .unwrap_or_else(|| panic!("{id}: {item}"));
-                let path = sources_dir().join(file.strip_prefix("sources/").unwrap_or(file));
-                let text = std::fs::read_to_string(&path)
-                    .unwrap_or_else(|_| panic!("{id}: {file} is not vendored"));
-                let hay = squash(&text);
-                // Every quoted pin is verbatim in the file.
+                // The vendored texts live with the consumer (wanderbooks'
+                // `docs/spec/sources`), which checks each pin verbatim;
+                // here a citation names its file and quotes a pin.
+                assert!(file.ends_with(".md"), "{id}: {file}");
                 let quoted: Vec<&str> = rest.split('"').skip(1).step_by(2).collect();
                 for q in &quoted {
-                    if !hay.contains(&squash(q)) {
-                        bad.push(format!("{id}: {q:?} is not in {file}"));
+                    if q.trim().is_empty() {
+                        bad.push(format!("{id}: an empty pin in {file}"));
                     }
                 }
                 if quoted.is_empty() {