chore(history): define clean 8-commit rewrite plan for dev-progress-bar

[Copilot]

This addresses the request to rebuild dev-progress-bar history from 0fb412c into a small set of logical, atomic Conventional Commits while removing temporary development states. The result is a commit plan that preserves final behavior and clarifies sequencing.

• What this PR delivers

  • Proposes an 8-commit history rewrite that groups changes by concern (progress/task architecture, generator integration, UI cancellation/notifications, typing refactor, project scan refactor, logging service, docs, tests).
  • Splits multi-topic file edits across commits where needed (same file can appear in multiple commits with scoped diffs).

• History cleanup rules applied

  • Excludes temporary artifacts and churn from rewritten history (TODO, todo_web/**, test.py, empty.gsmap, app.log, log.py, transient thread-worker path).
  • Ensures intermediate states are not preserved (only intentional end-state diffs remain).

• Commit plan shape

  • Ordered to keep dependency flow clear:
    1. progress/task foundation
    2. generator progress integration
    3. notifications + cancellation UX
    4. tab/type refactor (types.py → simple_types.py)
    5. project scan refactor
    6. structured logging service
    7. progress-bar developer docs
    8. test reorganization + new coverage

feat(progress): introduce background task controller and progress tracking foundation
feat(progress): integrate phase/iteration progress into generation pipeline
feat(ui): add task notifications and graceful task cancellation UX
refactor(ui): move tab refresh responsibilities into task flow and centralize tab typing
refactor(project): improve project scanning methods and related model usage
feat(logging): replace ad-hoc logging with structured logging service
docs(progress): add developer guide for live progress bar task integration
test: reorganize test layout and add coverage for progress/task/logging/notifications