C03: Add Rachel Bluwstein — 4 PDM-1.0 pages, highest-res modern Hebrew cursive

[shaypal5]

Summary

Add Rachel Bluwstein (Rachel the Poetess, 1890–1931) as the second writer in the corpus. Four PDM-1.0 pages are available in the upstream repo, including one explicitly identified as the highest-resolution Bluwstein scan on Wikimedia Commons. Her handwriting is clear, flowing secular Hebrew cursive — a stylistically distinct contrast to Bialik's literary hand.

Writer record

Field	Value
writer_id	rachel_bluwstein
display_name	Rachel Bluwstein
also_known_as	Rachel the Poetess, רחל המשוררת, Rachel Bluwstein-Sela, Рахель Блувштейн
born / died	1890 / 1931 — PDM in all life+70 jurisdictions
scripts_written	Hebr
languages_written	he, ru
period	1910–1931
VIAF	https://viaf.org/viaf/5722988/
Wikipedia	https://en.wikipedia.org/wiki/Rachel_Bluwstein

Upstream sources

entry_id	license	Notes
commons__rachel_gan_naul__p0001	PDM-1.0	Highest-resolution Bluwstein scan on Commons — start here
commons__rachel_rak_al_atzmi__p0001	PDM-1.0	Poem Only About Myself
commons__rachel_aqara_1928__p0001	PDM-1.0	Poem Aqara (Barren Woman), dated 1928
commons__begani_netatikha__p0001	PDM-1.0	Poem In My Garden

All four: rights_basis: public_domain, attribution_required: false.

Acceptance criteria

• New rachel_bluwstein writer row in writers.jsonl with status: verified
• At least 15 distinct letter forms added (target: full 27-form coverage across the four pages)
• Additional variants of the same letter (from different pages) ingested as v0002, v0003, etc.
• All entries pass python3 scripts/validate_indexes.py --upstream-path <upstream>
• python3 scripts/generate_release_artifacts.py --check passes
• python3 -m pytest passes

Ingest notes

• Open commons__rachel_gan_naul__p0001 first — highest resolution = best per-letter pixel density
• entry_id format: rachel_bluwstein__<letter_name>__v0001
• File path: data/letters/rachel_bluwstein/<letter_name>/rachel_bluwstein__<letter_name>__v0001.<ext>
• If the same letter appears across multiple pages, add further variants rather than skipping — variant diversity is valuable for HTR training
• letter.style should reflect her secular Ashkenazi cursive hand