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feat(*)!: publish ES module builds with exports maps and drop the UMD bundles (#682)

* refactor(*): load dependencies with import statements

An ES module build cannot follow a require() call: esbuild keeps it as a runtime require, which throws in browsers (the concerto-core one in markdown-transform runs at load time). Convert the five remaining calls to imports and declare the two untyped modules. dayjs has no exports map, so its plugin subpath carries the .js extension Node ESM needs.

Signed-off-by: Ujjwal Verma <ujjwalverma010305@gmail.com>

* feat(markdown-template): hash formula names with @noble/hashes

formulaName() was the only use of Node crypto, which pulled about 1 MB of crypto-browserify into browser bundles. @noble/hashes 1.x is a pure JavaScript SHA-256 (5 KB minified) with CommonJS and ESM builds. Names are unchanged; new tests compare against Node crypto.

Signed-off-by: Ujjwal Verma <ujjwalverma010305@gmail.com>

* feat(*)!: publish Node and browser ES module builds with exports maps

scripts/build-esm.js, modelled on Concerto v5, emits lib/esm (import condition) and lib/esm-browser (browser condition) next to the CommonJS lib/. Dependencies stay bare imports so consumers share one copy of each; the browser build stubs Node builtins and jsdom. scripts/smoke-esm.mjs runs after the root build.

BREAKING CHANGE: each package now has an exports map, so deep imports into lib/ no longer resolve, and Node import loads the ESM build.

Signed-off-by: Ujjwal Verma <ujjwalverma010305@gmail.com>

* test(e2e): exercise the browser ES module build

Bundles the packages through the browser export condition with esbuild, as an application would, and runs the result in Chromium.

Signed-off-by: Ujjwal Verma <ujjwalverma010305@gmail.com>

* feat(*)!: drop the UMD browser bundles

The exports maps already route webpack 5, Vite, Rollup and esbuild to lib/esm-browser, so the UMD bundles only served script-tag users and tools that do not read exports. R... (continued)

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