feat: Merge isohash functionality into smarthash for cross-environment hash support

- Updated test files to use new tapbundle import from @git.zone/tstest.
- Created a new plan for merging isohash into smarthash, detailing objectives and implementation steps.
- Added browser-specific tests for SHA256 hashing functions in test/test.browser.ts.
- Implemented browser-compatible hashing functions in ts_web/index.ts using Web Crypto API.
- Introduced plugins for environment detection and JSON handling in ts_web/plugins.ts.
- Ensured that existing smarthash functionality remains intact and consistent across environments.

npmextra.json

@@ -5,7 +5,7 @@
       "githost": "code.foss.global",
       "gitscope": "push.rocks",
       "gitrepo": "smarthash",
-      "description": "Provides simplified access to Node.js hash functions, including SHA256 and MD5, with support for strings, streams, and files.",
+      "description": "Cross-environment hash functions (SHA256 and MD5) for Node.js and browsers, with support for strings, streams, and files.",
       "npmPackagename": "@push.rocks/smarthash",
       "license": "MIT",
       "keywords": [
@@ -15,6 +15,9 @@
         "MD5",
         "security",
         "node.js",
+        "browser",
+        "cross-environment",
+        "web crypto",
         "stream hashing",
         "file hashing",
         "synchronous hashing",