[Goal #349] Add Rust/WASM acceleration coverage for core functions

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Goal

Add Rust/WASM acceleration coverage for every eligible tsb core function while keeping the existing TypeScript implementations as the default-compatible fallback.

Closes #349

What Changed (Run 3)

Coverage manifest gap filled (wasm-coverage.json)

Added 22 missing entries that were previously absent from the 121-entry manifest:

From src/core/index.ts (11 entries):

• Flags, getFlags — WeakMap-backed runtime metadata; JS-object-identity blocker
• MaskedArray, IntegerArray, FloatingArray, BooleanArray, StringArray, DatetimeArray, TimedeltaArray — nullable extension array classes; JS class-instance and callback semantics blocker
• SparseArray, SparseDtype — sparse storage class with JS fill-value semantics

Direct top-level core exports from src/index.ts (11 entries):

• getOption, setOption, resetOption, describeOption, optionContext, registerOption, options — runtime options registry/Proxy; no numeric kernel
• api, apiTypes — namespace objects; not numeric functions
• pdArray, PandasArray — factory/wrapper; JS dispatch + class semantics

Updated summary: 143 total entries (6 rust-wasm, 137 ts-only-ineligible, 0 unclassified, 0 eligible_missing)

Coverage check now validates against live export surface (scripts/wasm-coverage-check.ts)

The script now:

1. Parses all value exports from src/core/index.ts
2. Parses all top-level value exports from src/index.ts whose source is under src/core/
3. Fails with a descriptive error listing which exports are missing from the manifest

This satisfies the contract requirement: "The Rust/WASM coverage check fails when an export is present in src/core/index.ts or in top-level core re-exports but missing from the manifest."

Verification

npx tsx scripts/wasm-coverage-check.ts
✓ Rust/WASM coverage manifest is valid.
  Total core entries : 143
  rust-wasm          : 6
  ts-only-ineligible : 137
  unclassified       : 0
  eligible_missing   : 0
  live exports audited: 143 (132 core/index + 133 top-level core re-exports, 143 unique)
  missing from manifest: 0

Context

• Run 2 implemented the initial Rust/WASM layer (natsort + searchsorted/argsort) with 121-entry manifest — merged as PR [Goal #349] Add Rust/WASM acceleration coverage for core functions #356 (2026-06-27)
• Issue was updated 2026-07-02 with a more stringent completion contract that identified the manifest gaps above
• Run 3 fills the gaps and upgrades the coverage check script

Note

Full evidence script (bun run wasm:build && bun run wasm:test && bun run wasm:coverage && bun run bench:wasm-core) requires Bun and the Rust/WASM toolchain. The environment in this workflow run does not have Bun installed (network-restricted environment). The coverage check passes via npx tsx.

This PR is maintained by the Goal workflow. Each run may add commits to the same branch.

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_{Comment /goal to run again}

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Commit pushed: a303d08

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Commit pushed: 7d992f4

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Evergreen repair pushed — fixed Test & Lint failures in src/core/series.ts:

Issue	Fix
noExcessiveCognitiveComplexity on sortValues (complexity 16, max 15)	Extracted _svCacheGet() private helper; sortValues now has complexity 1
noNonNullAssertion (31 violations on typed array accesses)	Removed all ! non-null assertions — Uint32Array element access returns number, not number | undefined

Commit: 3aba5d0 — awaiting CI to confirm gates pass.

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