Fix relay file directory decoding and preserve exact RCB options

[masarray]

Field defects fixed

• A real relay FileDirectory response wraps its DirectoryEntry items in a SEQUENCE. The previous decoder treated that wrapper as one entry, collapsed FRA00019.cfg and FRA00019.dat, lost the nested file attributes, and produced the observed single CFG / Missing DAT / size unknown row.
• FileDirectory file specifications are now emitted as one case-preserving slash-separated GraphicString.
• Live RCB TrgOps and OptFlds values are often returned as MMS bit strings such as bits(08, unused=2). The exporter previously searched those strings for words, forced GI=true, and omitted bufOvfl, so exported CID options did not match the IED.

Changes

• decode both standard [0] -> SEQUENCE OF DirectoryEntry and direct-entry layouts without collapsing companion files
• preserve returned full paths and avoid duplicating the requested directory
• decode engineer-readable and rendered MMS RCB bit strings
• carry TriggerOptions, OptionalFields, BufTm and IntgPd through read-only availability snapshots
• merge exact selected-RCB evidence into the cloned live model
• post-process authoritative live SCL output with exact dchg/qchg/dupd/period/gi and OptFields including buffer overflow

Regression coverage

• nested FileDirectory response containing COMTRADE/FRA00019.cfg and .dat returns two files with their sizes
• direct-entry layout remains supported
• GI-only bits(08, unused=2) is exported as GI only
• buffer-overflow-only bits(0200, unused=6) is exported with only bufOvfl=true

No runtime RCB write or reservation is added; the new export evidence remains read-only.

[chatgpt-codex-connector]

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