feat(extractor): resumable seam for giant OST/PST parsing#59
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Make indexing of a single OST/PST resumable so a restart mid-file does not reparse from byte 0. The resumable unit is the mail message, keyed by its descriptor node id (stable across runs, already the dedup key). This is the self-contained extract-lib half; datashare persists which units are durably indexed and supplies the skip policy on a resumed run. - feat(parser): add ResumePolicy (context-carried skip predicate, NONE default) - feat(parser): ResilientOutlookPSTParser skips already-done messages without re-parsing, still counting them so reconciliation stays honest, and stamps a stable tika:pst_resume_key on every emitted message plus a tika:pst_resumed_skipped visibility counter - feat(extractor): add Extractor.setResumePolicyProvider seam, wired into the parse context like PstFanoutConfig; inert (NONE) by default - test: skip-all / skip-subset / off-by-default at the parser level, and end-to-end id determinism (resumed id set is a strict subset of the full run)
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Groundwork for resuming a large PST/OST interrupted mid-parse instead of restarting it from scratch; a 50 GB mailbox cost ~17h of wasted re-processing last run. Extraction-side hook only, inert until the datashare side persists progress, so behavior is unchanged for now.