Tests: refresh the outdated test suite

[kalwalt]

Summary

The current test suite (Karma + Jasmine, run via npm run test:all across the min/debug/wasm/simd/es6 targets) is outdated and doesn't reflect the current API and build matrix. Refresh it so the tests are meaningful and green against the latest library.

Motivation

• The library has evolved (TS sources, ES6 builds, the new experimental Node.js build) but the specs haven't kept pace.
• Outdated/irrelevant tests reduce trust in CI and hide real regressions.

Scope / tasks

• Audit existing specs vs. the current public API; remove/replace dead or irrelevant tests.
• Ensure each build target in test:all (min, debug, wasm, simd, embed-es6, es6, es6-simd) has at least smoke coverage that actually exercises NFT load + process().
• Refresh fixtures (camera params, NFT dataset, test image) to match the examples.
• Confirm the Karma + Jasmine config is current (versions bumped in the recent dep work) and stable headless/CI.
• Make npm test reliably green locally and in CI.

Notes

• Related: coverage reporting tracked separately (see the Codecov issue).
• The experimental Node.js build (Feature node libs #140) is currently untested — node-specific tests can be folded in here or split out later.