fix: preserve nested list item semantic units

[seonghobae]

Summary

• Preserve li ownership when HTML/Word flow blocks such as p or div are nested inside a list item.
• Keep table-row and footnote precedence unchanged.
• Retain declared and visible indentation as semantic-unit metadata.

Evidence

• uv run --frozen --extra dev --extra backend pytest tests/test_chunking.py -q -> 37 passed
• uv run --with ruff ruff check lineageweave/chunking.py tests/test_chunking.py -> passed
• python -m compileall -q lineageweave/chunking.py tests/test_chunking.py -> passed

Closes the parser gap described by the source semantic-unit ADR: list-item meaning must survive nested flow markup.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.

[seonghobae]

Current-head audit (2026-08-21):

• Exact head: 1384ba250328f5795f8daebba346a54376b9bcaf
• Exact base: feat/uiux-standard-guide-v3-restacked at dd7156dadf62d5eff79def3aff2108f7d33e7e7d
• uv run --extra dev --extra backend pytest -q tests/test_chunking.py: 37 passed
• Ruff, compileall, and git diff --check: passed
• No additional code change was necessary after tracing _semantic_label through direct, nested, table, and footnote callers.

Merge remains gated: formal independent approval and terminal required Checks are still absent/queued.