release: Health v2 (0.2.0) — version bump, README v2 table, CHANGELOG [0.2.0]

[belarusian]

Ships the Health v2 arc (Cycles 14-18) as the second release.

What

• Version bump 0.1.0 -> 0.2.0: fleet/init.py, pyproject.toml, and the hard-coded version test (test_cli_version_is_0_1_0 -> test_cli_version_is_0_2_0). The two dynamic version tests are unchanged.
• README: new 'Health classification (v2)' section — four-class table (stranded/active/paused/dead), the most-severe-wins rule, the max_steps_reached-only in-flight rule, the v1/v2 30-day boundary divergence, the Git column, --filter stranded|paused, and the snapshot health_v2 field.
• CHANGELOG: new [0.2.0] entry covering the Health v2 arc (gittest, classify_health_v2, ProjectHealth.health_v2, report Git column, CLI filter, snapshot v2, integration); [0.1.0] intact.
• Tickets: TICKET-073..077.

Gate

• pytest tests/ -x -q: 153 passed
• ruff check fleet/: clean
• mypy fleet/ --ignore-missing-imports: clean (8 files)
• fleet --version prints 'fleet 0.2.0' (exit 0)

Tag decision

No prior tags exist in the repo, so per the briefing the v0.2.0 tag is skipped to keep the cycle minimal.

Closes #81 #82 #83 #84 #85