Brings L1 (RPC API) + L3 (lifecycle survival) parity coverage to the
three multi-app stacks that were previously only touched by
required-stack.bats. Combined with bitcoin-knots / lnd / electrumx
already shipping, the six core apps now have dedicated bats files.
Each suite is shaped like the existing single-container suites
(bitcoin-knots / lnd / electrumx) and gates every assertion on the
backing container actually being present, so a node without the stack
installed gets clean skip messages instead of false fails.
* btcpay.bats — 9 tests, including stack-wide presence and a
"supporting containers don't cascade-restart" guard
* fedimint.bats — 8 tests, single container
* mempool.bats — 9 tests, mixed legacy + orchestrator-managed stack;
reuses the :8999 mempool-api probe from required-stack for parity
Total bats now: 88 (was 53 → +35).
TESTING.md matrix advances 23 → 50 of 110 cells.
UI URL coverage for these three apps already lives in
ui-coverage.bats, so this PR doesn't duplicate proxy-path probes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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