feat(failure-intel): retry- and history-aware test status (#141)

[shossain786]

What & why

Flakiness was a pass/fail ratio only and ignored retries. Each test now gets a status from this run's retries and the earlier runs in target/metrics-history/:

Status	Rule
Passed on retry	failed an attempt, then passed
Newly failing	failed now; every earlier run in the window passed
Consistently failing	failed now and in at least 2 earlier runs, no pass among them
Intermittent	failed now; earlier runs mixed

A test that passed first time, or has no history, gets no status (except passed on retry).

• TestStatusAnalyzer.classify(...) is a pure function; forRun(...) reads the history.
• Computed in exportToJson() before this run's history copy is written, and files written by this JVM are excluded, so a run is never compared with itself (TestNG fires onFinish per suite).
• Report: "Test status" card next to the Flakiness Radar, badge in the failure detail, newly failing listed first in the Failures tab.
• Metrics JSON gains testStatus.
• No change to STABLE/WATCH/HIGH thresholds or failOnHighFlakiness.

Part of #138. Closes #141.

Verification

mvn test: 659 run, 0 failures (638 on master + 21 new): empty history, single run, skipped runs, unreadable history file, double export in one JVM, report ordering.

Notes

• Consistently failing needs 2 earlier failures; one earlier failure plus one now gets no label rather than a weak one.
• Touches the same changelog lines as feat(locator): waitFor, allTextContents, element screenshot (#135) #150/feat: add focused empty and regex assertions (#136) #151; whichever lands later needs a trivial rebase.

🤖 Generated with Claude Code

[shossain786]

Added flakiness.historyDir / -Dseleniumboot.history.dir to this PR: history can now live outside target/, so builds that clean it or discard the CI workspace can still get the Radar and the statuses. Default location unchanged; docs have a GitHub Actions cache recipe. mvn test 663/0.

🤖 Generated with Claude Code