Release Helper Tools 0.1.0

SOURCE.md

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+# Corresponding source and provenance
+
+The corresponding source for Helper Tools 0.1.0 will be published at:
+
+https://git.add-ideas.de/lotobo/helper-tools/src/tag/v0.1.0
+
+Before that tag exists, the `main` branch in the same public repository is the
+preferred source under active review. Build the release with Node.js 22 and the
+exact dependency graph in `package-lock.json`:
+
+```sh
+npm ci
+npm run release:artifact
+```
+
+The JavaScript/CSS bundles, npm tarball and generated declarations are outputs,
+not the preferred form for modification. No runtime code is loaded from a CDN.
+
+## Implementation provenance
+
+- The helpers and interface are original TypeScript and React project code.
+- Toolbox manifest, shell and artifact checks use the shared Toolbox SDK 0.2.3.
+- Encoding formats, IP notation, JSON, CSV, SI/IEC units, Unicode, ISO 8601,
+  checksum and digest algorithms were implemented from public specifications
+  and established interoperable formats; no source from an online calculator
+  is bundled.
+- Cryptographic digests and secure randomness use the browser Web Crypto API.
+  The seeded generator is deliberately labelled non-cryptographic.