Add SuttaCentral parallels panel with fetch helpers and tests

[anantham]

Motivation

• Surface SuttaCentral parallel witnesses in Sutta Studio so users can view related root texts without schema or storage changes.
• Keep the work view-layer only (no persistence, no alignment, no polyglot schema), enabling future lens/analysis work to attach to a stable UI surface.

Description

• Added services/scraping/scParallels.ts with fetchParallels and fetchParallelText that use the existing fetch-proxy and normalize/flatten the nested SC /api/parallels response, dedupe results, and assemble root text from root_text blocks.
• Introduced ParallelType and ParallelInfo in types/suttaStudio.ts to type the service/UI contract.
• Implemented a new ParallelsPanel React component (components/sutta-studio/ParallelsPanel.tsx) that is a collapsible sidebar listing parallels and loading a parallel's root text on demand.
• Mounted the panel in SuttaStudioApp for suttacentral routes only and added a unit test tests/services/scraping/scParallels.test.ts to verify nested-parallels flattening and normalization.
• Updated documentation and pickup-plan bookkeeping: docs/WORKLOG.md, docs/sutta-studio/PLANS/README.md, and added docs/sutta-studio/PLANS/SHIPPED/polyglot-foundations.md to record the shipped plan.

Testing

• Ran npx vitest run tests/services/scraping/scParallels.test.ts, which succeeded (test verifies nested SC parallels are flattened and normalized).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
lexicon-forge	Ready	Preview, Comment	May 15, 2026 1:54pm