feat(smartdiff): Migrate package to ESM, replace fast-diff with and add rich diff APIs + formatters

changelog.md

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+# Changelog
+
+## 2025-12-14 - 1.1.0 - feat(smartdiff)
+Migrate package to ESM, replace fast-diff with `diff` and add rich diff APIs + formatters
+
+- Set package to ESM (added "type": "module" to package.json)
+- Replaced legacy fast-diff usage with the maintained `diff` package and exported it via plugins
+- Added backward-compatible compact API: createDiff(original, revision) and applyPatch(original, diff)
+- Introduced character/word/line/unified diff helpers (getCharDiff, getWordDiff, getLineDiff, createUnifiedDiff)
+- Added console and HTML formatters (ANSI color output and HTML span/div output) and getDefaultDiffCss helper
+- Expanded and modernized test suite (many new tests) and switched test tooling to @git.zone/tstest
+- Updated devDependencies and author metadata, and updated npmextra.json release metadata and registries
+- Removed legacy CI configuration (.gitlab-ci.yml) and cleaned up TypeScript config
+
+## 2024-05-29 - 1.0.3 - maintenance
+Consolidated maintenance, metadata and config updates.
+
+- Update package description.
+- Update TypeScript configuration (tsconfig).
+- Update npmextra.json githost settings (applied across multiple commits).
+- Switch to new organization scheme.
+- Multiple duplicate/housekeeping commits across 2021–2024 were consolidated into this release.
+
+## 2021-12-17 - 1.0.2 - fix(core)
+Core fixes and small updates.
+
+- fix(core): update — applied core fixes (details not present in commit message).
+- Release/tag commits around 2021-12-16–2021-12-17 consolidated here.
+
+## 2021-12-16 - 1.0.1 - fix(core)
+Initial patch with core updates.
+
+- fix(core): update — core update/fix included.