Fix critical regressions and performance issues

[Pollux12]

This fixes some critical regressions as a result of 1.2.0 which were resulting in the language server being broken in some codebases. It also significantly improves performance as a whole.

Greptile Summary

The PR addresses language-server regressions while restructuring incremental analysis and request freshness behavior to reduce editor latency.

• Splits edited-file self-indexing from deferred dependency ripples so document-scoped requests can resume sooner.
• Adds indexing, inference, diagnostics, completion, and parser optimizations with expanded regression and determinism coverage.
• Introduces latency, benchmark, and index-determinism tooling for large workspaces.
• Improves progress reporting, logging, cancellation, stack sizing, and diagnostic refresh behavior.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains within the eligible follow-up-review scope.

No blocking failure remains.

Important Files Changed

Filename	Overview
crates/glua_ls/src/context/debounced_analysis.rs	Separates fast edited-file indexing from deferred cross-file reconciliation and coordinates request handoff, refreshes, and cancellation.
crates/glua_ls/src/handlers/diagnostic/document_diagnostic.rs	Preserves existing diagnostics while analysis is unavailable or cancelled instead of clearing client state with an empty report.
crates/glua_ls/src/handlers/request_handler.rs	Adds document-scoped freshness and reader-handoff handling around latency-sensitive requests.
crates/glua_code_analysis/src/compilation/analyzer/gmod/mod.rs	Reworks network-flow discovery around indexed helper call sites and cached resolution.
crates/glua_code_analysis/src/db_index/member/mod.rs	Expands member indexing and reconciliation state used to make incremental analysis more deterministic.
crates/glua_code_analysis/src/db_index/type/type_ops/union_type.rs	Optimizes and stabilizes union construction and type aggregation behavior.
crates/glua_parser/src/syntax/mod.rs	Adds bounded syntax-node lookup caching and fast-hash-backed parser data structures.
tools/determinism/src/main.rs	Extends the determinism harness with index, edit/revert, convergence, expansion, and allocation diagnostics.
tools/lsp_latency.js	Adds an interactive end-to-end latency and cancellation harness for the stdio language server.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Document change] --> B[Apply text update]
    B --> C[Debounced self-index]
    C --> D[Unblock requests for edited document]
    D --> E[Completion, hover, and document diagnostics]
    C --> F[Accumulate dependency expansion]
    F --> G{Typing quiet or deferral cap reached?}
    G -- No --> B
    G -- Yes --> H[Run dependency ripple]
    H --> I[Invalidate shared diagnostic cache]
    I --> J[Refresh supported semantic and inlay features]
    I --> K[Schedule idle workspace diagnostic refresh]

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