siera 0.5.6

Fixed readARS() crash when ARS metadata contains no referencedAnalysisOperations (continuous-only tables such as shift tables) by ensuring accumulator frames are initialised with their merge key columns.
Normalised Windows backslashes in ADaM file paths to forward slashes so generated scripts run correctly on both Windows and Unix systems.
Added CDISC ARD-compliant column stamping: generated scripts now write group[n]_groupingId, group[n]_groupId (for pre-defined groups) and group[n]_groupValue (for data-driven groupings) onto each ARD row.
Supported arbitrarily deep nesting in mainListOfContents via a recursive LOPA extraction helper, removing the previous three-level hard limit.
Expanded support for multi-value ARS group conditions (IN/NOTIN) by unnesting condition.value list columns in the JSON parser.
Coerced *_level columns to character on each individual ARD frame before bind_rows, preventing type conflicts between continuous and categorical analyses.
Allowed more than three grouping factors per analysis.
Updated bundled cards_constructs.xlsx example file and extended test coverage across metadata parsing, ADaM loading, and ARD script generation.

siera 0.5.5

Strengthened analysis method validation with clear errors for missing or undefined MethodId values and warnings when method templates or parameter value sources cannot be resolved.
Added guardrails for analysis set generation that warn on missing or incomplete metadata and fall back to the unfiltered analysis dataset when needed.
Tightened ARS metadata ingestion by requiring analysisSets definitions in JSON and the analysis code template sheets in Excel workbooks.
Expanded test coverage for analysis methods, analysis sets, and data subset condition handling to capture more metadata edge cases.