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ci: per-file test-duration balance report tooling (#2650)

* ci: per-file test-duration balance report tooling

Add scripts/ci-balance-report.ts: parses vitest junit XML into per-file
durations, per-bucket totals with spread, duplicate/unresolved-path flags,
and coverage against the shard-config oracles (scripts/test-daemon.sh
SHARDS, scripts/test-online.sh modules, web src walk). Works on local
test-results dirs and artifact-downloaded layouts; appends the report to
$GITHUB_STEP_SUMMARY when set.

CI wiring: test jobs upload junit unconditionally (unit shards, online
modules, web) and a new read-only test-balance-report job downloads them
and renders the consolidated balance report into the run summary. Not
part of all-tests-pass gating.

* fix(ci): keep balance-report tests clear of bun's 5s per-test timeout

Review feedback (PR #2650): tests calling buildReport synchronously ran
the bash shard oracles, and the online oracle alone can take ~5s on a
slow runner — right at bun test's default timeout. Oracle results are
now cached per suite, aggregation tests skip the oracle via
{ coverage: false } (they assert nothing about coverage), and the one
coverage test keeps the oracle with an explicit 30s timeout.

* fix(ci): address balance-report review — oracle skip, per-suite isolation, empty-suite coverage

Review feedback (PR #2650): --no-coverage now passes { coverage: !noCoverage }
into buildReport so the shard oracles never execute (previously the flag only
discarded results after several seconds of subprocess work); oracle failures
are isolated per suite and rendered alongside partial coverage rows instead
of being silently suppressed; and a valid-but-empty junit (whole suite ran
zero files) still enters coverage via standard artifact-path markers, so a
whole-suite collection failure reports every expected file as missing.

44679 of 60073 branches covered (74.37%)

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60680 of 72443 relevant lines covered (83.76%)

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