spec - config.test.ts:empty importRoots array uses default alias mapping

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Idea	Status	Tags	Summary
configuration_import_roots			`importRoots` is an optional array of alias-to-directory mappings in `.reqlan/config.json`. Each mapping has: - `alias` ( required non-empty string ): prefix before `/` in aliased import paths. - `root` ( optional non-empty string ): directory for that alias. A relative `root` resolves against the base root ( the parent of `.reqlan` ), not against the `.reqlan` directory. An absolute path or `file://` URI is used as that alias' import-root directory directly. When `root` is omitted for a mapping, that alias uses the workspace folder that contains the `.rq` file. When `importRoots` is omitted, empty, or has no valid entries, the default is one mapping with alias `@` and no explicit root. When several aliases could match a path, the longest alias wins. Invalid or unreadable JSON, and a non-array `importRoots` value, fall back to defaults ( or no loaded config for discovery, then defaults at resolve time ). Language path forms and `@/` shorthand: ["../language/imports.rq".import_paths] and ["../language/imports.rq".configuration_import_root_alias]. Schema: [configuration_schema_file]. Applying file discovery: [configuration_location]. Editor completion of aliased import paths: ["./syntax/features-syntax.rq".code_completion].
configuration_location			An optional `.reqlan/config.json` may appear under a base's `.reqlan` directory. For a given `.rq` file, the applying base is the nearest ancestor directory that owns a `.reqlan` folder. The applying config is that base's `.reqlan/config.json` when present. If the owning base has no `config.json`, or no owning base is found, defaults from [configuration_import_roots] apply. A child base does not inherit a parent base's config. Implemented by ["../../packages/language/src/reqlan-path-resolve.ts"].

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../../packages/language/test/config.test.ts:empty importRoots array uses default alias mapping