feat(scip): resolve parent_symbol_id from SCIP descriptor chain

[jafreck]

Summary

The SCIP indexer now sets parent_symbol_id for every symbol that has an enclosing parent in the SCIP descriptor hierarchy.

Previously parent_symbol_id was only populated by the tree-sitter extraction path, leaving it NULL for all SCIP-indexed symbols. This meant the parent_name fields in lore_graph, lore_dependents, and lore_lookup returned no data for SCIP-covered languages (Java, Go, Python, Rust, C#, etc.).

Approach

SCIP symbol strings encode a descriptor chain that naturally represents the containment hierarchy. The parent of any symbol is obtained by stripping the last descriptor.

Symbols are sorted by descriptor depth (shallowest first) before insertion, so parents are always in scipToLoreId before their children. The parent lookup walks up the chain past skipped intermediates (modules, type literals) until it finds a symbol that was actually inserted, then includes the resolved parent_symbol_id in the original INSERT — no separate UPDATE pass needed.

Changes

• extractParentScipSymbol() — strips the last SCIP descriptor to produce the parent symbol string
• descriptorDepth() — counts descriptors for depth-first insertion ordering
• findDescriptorNameStart() — backward-walks descriptor boundaries
• Symbol insertion loop sorts by depth and resolves parent_symbol_id inline
• INSERT INTO symbols now includes parent_symbol_id directly
• 10 unit tests for extractParentScipSymbol

Impact

Indexing lore-self: 2036 / 7604 symbols gain parent_symbol_id — methods (98%), enum members (100%), constructors (100%), and interface/class properties correctly link to their enclosing container.

Testing

• 238 SCIP tests pass
• End-to-end verified on lore-self

[codecov]

Codecov Report

❌ Patch coverage is 97.01493% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.03%. Comparing base (d5eb579) to head (2bef21b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/indexer/stages/scip-indexer.ts	97.01%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
+ Coverage   87.97%   88.03%   +0.05%     
==========================================
  Files          85       85              
  Lines        9580     9643      +63     
  Branches     2971     2991      +20     
==========================================
+ Hits         8428     8489      +61     
- Misses       1152     1154       +2     

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