SRombauts / SQLiteCpp / 28398056940

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Improve unit test coverage of error and edge-case paths (#551)

Raises library coverage (98.1% on master) by adding unit tests for the
reachable but previously uncovered branches that the Coveralls report
flagged.

- `Statement`: `getChanges()` and the not-prepared guard (bind on a
moved-from statement)
- `Transaction`: `rollback()` after commit throws
- `Backup`: the `std::string` schema-name constructor on the success
path
- `Database`: `key("")` empty-key no-op
- `Savepoint`: destructor swallows a failing rollback (never throw in a
destructor)

The remaining few uncovered lines are gcov artifacts (closing braces,
template `initializer_list` lines) or unreachable defensive guards.

Also updates the agent skills: how to query the Coveralls JSON API for
uncovered lines, a short-and-tight PR description convention, and a new
`windows-shell-commands` skill documenting PowerShell vs the Bash tool
for safe multi-line arguments (commit messages, PR bodies).

2 of 2 new or added lines in 2 files covered. (100.0%)

682 of 684 relevant lines covered (99.71%)

30.37 hits per line