refactor(workflows): consolidate package commands

[thejustinwalsh]

Summary

• reduce the Text manifest from 36 scripts to 10 and Font Baker from 15 scripts to 6
• expose ordinary build, test, typecheck, and check entrypoints plus explicit baked-product CI verification
• preserve specialized Unicode, fixture, MTSDF diagnostic, font-fixture, and fuzz work in separate erasable-TypeScript command families with discoverable prerequisites and writes
• deterministically enumerate Node test files without shell glob expansion, preserving Windows support
• stop rerunning Rust library suites during integration coverage; no build, test, conformance, fixture, fuzz, profiling, or oracle gate is removed

Verification

• Font Baker build, Rust unit/integration/doc tests, 19 Node integration tests, deterministic fuzz smoke, and Inter/Amiri/Noto CJK E2E fixtures passed
• Text build, all Rust package gates, MTSDF admission/SIMD/oracle evidence, 191 Node package/integration tests, and 6 deterministic fuzz tests passed
• both package typechecks, Text lint/format, command inventory tests, and OKF validation passed with zero errors or warnings
• package source digests were regenerated and matched after formatting

This is PR 3 of 3 and depends on #40.