Add full workspace reference index

[sidux]

Summary

Adds a full workspace indexing mode that builds complete symbol maps and a cross-file reference candidate index in the background. Full indexing is now the default strategy, so new/missing config uses strategy = "full" automatically. Users can still opt into lighter modes with strategy = "composer", "self", or "none".

Key changes:

• Make indexing.strategy = "full" the default in config/schema/docs.
• Start a background full workspace index after normal initialization.
• Add a reference index keyed by classes, functions, constants, members, and Laravel string keys.
• Use full-index data broadly where it is available:
  • class, function, constant, member, constructor, Laravel-string references now snapshot only reference-index candidate files instead of snapshotting all user files and filtering afterward.
  • rename benefits through the same reference engine.
  • go-to-implementation and type-hierarchy subtype lookups use the reverse inheritance index (gti_index) once workspace indexing is ready.
• Batch workspace parsing and index publication to avoid thousands of per-file lock/update cycles.
• Use weighted, largest-first progress reporting so large files do not create a misleading late tail.
• Bulk-evict reference-index batches in one pass

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 97.19276% with 45 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/references/mod.rs	94.20%	41 Missing ⚠️
src/parser/ast_update.rs	98.82%	4 Missing ⚠️

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[AJenbo]

Hey just to key you in, I decided I wanted this merged after 0.9.0 and so we spent a few days hammering that release in to shape and it's gone out to the public as of today ... I should probably have let you know before rather then after ... but um such are things sometimes. Any way this PR is now one of the next things to land so rejoice!

[AJenbo]

Thanks for doing this, big help, looks solid too.

Use weighted, largest-first progress reporting so large files do not create a misleading late tail.

nice