Show the capability directory on Raku, Perl and Clojure reference pages and fix Raku order, links and code blocks - #320

scripts/lib/core-recipes/powershell.mjs:2:10: Identifier 'chmodSync' is imported but never used.

scripts/lib/core-trace.mjs:151:9: Prefer String#startsWith over a regex with a caret.

scripts/lib/core-recipes/julia.mjs:63:51: Unnecessary escape character '$'

scripts/lib/core-recipes/julia.mjs:63:44: Unnecessary escape character '$'

scripts/lib/core-recipes/julia.mjs:63:15: Unnecessary escape character '$'

scripts/lib/core-recipes/ts.mjs:32:7: Variable 'handle' is declared but never used. Unused variables should start with a '_'.

scripts/lib/core-recipes/raku.mjs:101:30: Found a useless array length check

scripts/lib/core-recipes/ruby.mjs:121:74: Prefer String#startsWith over a regex with a caret.

scripts/lib/workspace-showcase-sources.mjs:161:79: Parameter 'refuses' is declared but never used. Unused parameters should start with a '_'.

scripts/gen-mcp-protocol.mjs:174:31: Unsafe `finally` block.