Kevin m kent/v2 domain intent taxonomy (#4071)

* Update domain and intent taxonomy to v2 (from clustering analysis)

Replace the original domain (20 categories) and intent (38 categories) definitions
with v2 taxonomy derived from clustering analysis:
- 16 domain categories (cicd_cloud_infra, cli_scripting, automated_testing, etc.)
- 13 intent categories (explain, find_content, research, review, etc.)
- Updated classification guidance with domain vs intent independence framing
- Updated prompt generation to match new category format

Scope and time estimate dimensions are unchanged.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add new_feature and refactor intents, remove design_review

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Clean up section header comments

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add backend_dev domain category

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Update src/extension/prompt/common/promptCategorizationTaxonomy.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Rename unknown to need_info for domain and intent categories

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Narrow project_config_docs domain to project management and issue tracking

Remove configuration files and documentation references from description and keywords.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Rename project_config_docs to project_management

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Rename project_management to project_mgmt, remove (v2) from taxonomy header

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Add ml_statistics domain category

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Kevin Kent <kevinkent@Kevins-MacBook-Pro.local>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Harald Kirschner <hkirschner@microsoft.com>

Author: 5 people