feat(parser): adaptive element relocation

[Liohtml]

Summary

Upstream sync (4/4). The README advertised adaptive parsing and SqliteStorage existed, but the parser had no relocation — nothing was ever saved or scored. This ports the feature from upstream Scrapling's parser:

• ElementData captures an element's unique properties (tag, cleaned attributes, direct text, root-to-element tag path, parent name/attributes/text, sibling and child tags), serialized through the existing SqliteStorage.
• Selector::save / Selector::retrieve persist and load that snapshot under an identifier.
• Selector::relocate scores every element in the tree against the snapshot (port of __calculate_similarity_score, using a Ratcliff/Obershelp sequence ratio equivalent to Python's difflib.SequenceMatcher.ratio()) and returns the best-scoring group at or above the threshold.
• Selector::css_adaptive wires it together: normal CSS first, fall back to relocation, optional auto_save re-persisting whatever was found (empty identifier defaults to the selector).

Upstream fixes are included from the start:

• default threshold 40 with a warning when nothing clears it (333b6de)
• auto_save skips the re-save when relocation returns nothing, instead of panicking on an empty result (cd4cdc6)

Storage is passed explicitly (&SqliteStorage) rather than via the Python original's global adaptive flag — no hidden global state.

Tests

11 new tests: sequence-ratio semantics vs difflib, element-data capture, save/retrieve roundtrip, relocation after a page restructure, below-threshold empty result, css_adaptive happy path + relocation path + failed-relocation regression (cd4cdc6) + missing-data and default-identifier behavior. Full suite green locally: 228 passed (cargo test, cargo clippy --all-targets -- -D warnings, cargo fmt --check).

🤖 Generated with Claude Code

https://claude.ai/code/session_01KDFsMaKk764vogjUW3nqpk

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f1761a2c-16b4-4e28-8411-96db4bfbd230

📥 Commits

Reviewing files that changed from the base of the PR and between df09f89 and 90a389d.

📒 Files selected for processing (4)

• src/parser/adaptive.rs
• src/parser/mod.rs
• src/parser/selector.rs
• tests/parser_adaptive.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/upstream-scrapling-changes-1sub94-pr4

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