#558 widen sqlite_store rescue to cover JSON::ParserError

[edmoffo]

Fbe::Middleware::SqliteStore#read previously rescued only Zlib::Error, so a deflate stream that decoded into a non-JSON payload — partial writes, SQLite corruption recovery, leftover rows from older serializations — escaped as JSON::ParserError from read and crashed Faraday::HttpCache on every subsequent lookup for that key. The poisoned row stayed in the database because the existing delete(key) branch only ran on a Zlib failure, so until something else evicted the key the middleware was wedged on it.

The rescue is widened to also catch JSON::ParserError and TypeError, and the log line is renamed from Failed to decompress to Failed to decode to cover both branches. delete(key) still runs, so the next request rebuilds the entry from the network.

A regression test in test/fbe/middleware/test_sqlite_store.rb writes a valid deflate stream of a non-JSON payload directly through the store's SQLite handle and asserts that read(key) returns nil and that all reports an empty cache. Ran bundle exec ruby -Ilib -Itest test/fbe/middleware/test_sqlite_store.rb locally — 24 tests pass — and bundle exec rubocop is clean on both touched files.

Closes #558

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