test: Health v2 Integration — e2e v2 pipeline + CLI --filter paused

[belarusian]

Cycle 17 (Health v2: Integration). Ties the three v2 links together as one composed path: discover -> assess -> classify_health_v2(read_gitstate(...)) -> render_portfolio(healths, git_states).

Test-only cycle; no fleet/ source change (the capability is already merged in Cycles 14-16).

What's added

• tests/test_integration_v2.py (new):
  • test_integration_v2_pipeline_stranded_paused_dead — an in-tree fixture root of real git repos carrying the Build-Order canary shapes (alloc-pipeline -> stranded: unmerged build42 branch + 2 unpushed commits; deepseek-deharness -> paused: clean main; gamma -> dead: no git repo). Asserts the composed pipeline yields the three v2 classes and the exact 7-column table (Git column: unmerged:build42/model-persistence-rebalance,unpushed:2 / - / -).
  • test_integration_v2_filter_stranded — mirrors the CLI --filter stranded logic; selecting the v2 stranded class yields exactly alloc-pipeline.
  • test_integration_live_root_self_consistent — a live-root smoke test over ~/AI that asserts the pipeline runs and every reported class is one of the four valid classes. It does not hard-assert stranded/paused (the live canary repos use master with no main, so read_gitstate yields EMPTY_STATE and the pinned classes are not reproducible live). Skips when ~/AI is absent.
• tests/test_cli.py: test_cli_status_filter_paused (the previously-untested paused branch of the v2 filter) + pins the v1/v2 Health-column divergence (a v2-filtered row still displays its v1 class).

Gate

• pytest: 146 passed (was 142, +4)
• ruff check fleet/ + tests/: clean
• mypy fleet/ --ignore-missing-imports: clean (8 files)

Closes #72
Closes #73