test: run full test suite in npm test, not just smoke tests

[dmchaledev]

Problem

The comprehensive test/calculate.test.mjs suite — 59 tests covering VM sizing, timing, cost, ROI, and recommendation logic — was added in dafee26, whose commit message stated it "Updated test script to glob." But the test script in package.json was never actually updated; it still ran only test/smoke.test.mjs:

"test": "node --test test/smoke.test.mjs"

As a result, npm test — and therefore CI (.github/workflows/ci.yml runs npm test) — only executed 6 smoke tests. The 59 calculation tests, the ones that actually validate the calculator's math, have never run in CI. A regression in the core sizing/cost engine would pass green.

Fix

Switch to Node's built-in test-file auto-discovery:

"test": "node --test"

node --test with no path argument discovers every *.test.mjs under test/ on Node 18+ (the package's declared floor, and all three versions in the CI matrix). This avoids shell-glob portability issues and automatically picks up any future test files.

Verification

	Before	After
npm test	6 tests	65 tests (9 suites)

# tests 65
# suites 9
# pass 65
# fail 0

All tests pass. Zero-dependency, no devDeps added — still uses the built-in node:test runner.

https://claude.ai/code/session_01PPx1tAHPfaY1BasyRLtUz6

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