feat(evidence): retain paragraph-span prototype as superseded evidence

[seonghobae]

Superseded by PR #83

This branch established useful exact-offset evidence, but its public semantic-unit contract equates units with blank-line paragraph splitting. That is not sufficient authority for mixed scripts, headings, lists, tables, code, captions, DOM structure, one oversized paragraph, exact final-payload token budgets, recursive recovery, hierarchy or context restoration.

PR #83 is the canonical design owner for the same TEPP bounded context. It preserves the useful exact-source-span direction while adding language-agnostic structure, immutable model profiles, rendered-payload accounting, lossless oversized-unit recovery, hierarchy, embedding_space_id, provider-neutral boundaries and APA 7 research traceability.

Preserve this branch and its regressions as historical implementation evidence. Port any unique useful tests into the post-#83 implementation plan rather than maintaining two competing semantic-unit contracts.

Closing this PR prevents ambiguous ownership and duplicate implementation lanes; it does not claim that PR #83 has already implemented the production capability.

Superseded by #83.

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[seonghobae]

Superseded by #83.

This branch correctly preserves exact paragraph offsets, but it treats text.split("\n\n") as the semantic-unit product contract. That scope does not satisfy the now-explicit requirements for language-independent base correctness, final rendered-payload token counting, a versioned embedding-model profile, recursive handling of one oversized paragraph, typed headings/lists/tables/code/captions/DOM blocks, optional dense boundary evidence, leaf/section/document hierarchy, mixed-script robustness, or parent/neighbor context restoration.

PR #83 proposes ADR 0017, a PRD v0.5 delta, research traceability, a full design, and an atomic TDD implementation plan. It preserves paragraph boundaries as one source-structure signal rather than accepting them as semantic truth. Closing this draft avoids parallel, contradictory public APIs and duplicate Checks. No implementation or release claim is transferred automatically; #83 remains a proposed design pending exact-head checks and independent review.