Ship GDATP release (3.0)
## Issue Summary
Ship a new release of the GitLab Duo Agent Translation Platform (GDATP) to capture all changes currently listed under `[Unreleased]` in the CHANGELOG.
## Language(s)
- [x] All/Multiple
## Details
The `[Unreleased]` section of `CHANGELOG.md` has accumulated a significant number of changes since the last release (v2.0.0 on 2026-02-06), including:
- **Korean (ko-KR) language support** - style guide, termbase (~450 terms), and system prompt integration
- **Translation memory and target update protection** via git history query
- **Terminology Extraction Agent** system prompt
- **File format specifications** directory with YAML parsing rules
- **Standard Operating Procedure (SOP)** documentation
- **Website translation rules** improvements (non-translatable keys, href post-processing, Schema.org structured data)
- **Core style guide restructuring** - renamed to `website-translation-rules.md`, consolidated "Never Translate" rules
- Various style guide cleanups (Italian, Portuguese, core)
- README and documentation updates
### Release checklist
- [x] Determine version number (likely 3.0.0 given the scope of changes, including new language and new agent)
- [x] Update `CHANGELOG.md`: move `[Unreleased]` items under the new version heading with today's date
- [x] Create a Git tag for the new version
- [ ] Create a GitLab Release via the GitLab UI (per the simplified release process from !31)
- [ ] Verify release artifacts and changelog are correct
## Expected Outcome
A tagged, published release of GDATP with all unreleased changes properly documented.
### Related Issues
- Related to: #16 (Implement changelog and semantic versioning for GDATP)
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