Function parseSpec

Returns Result<
    {
        title: string;
        overview: string;
        requirements: string[];
        acceptanceCriteria: string[];
        constraints: string[];
        issueReferences: { number: number; raw: string }[];
        fileReferences: { path: string; line?: number }[];
        missingSections: string[];
        rawMarkdown: string;
        techStack?: {
            language?: string;
            framework?: string;
            packageManager?: string;
        };
    },
    SpecParseError,
>