fix: move moldb-count-rows options under variables, and correct them

[tdudgeon]

moldb-count-rows had its options: block directly on the job rather than under
variables:. The schema's job object does not set
additionalProperties: false, so the stray key validated silently and the
options were ignored — this is hole 2 in
docs/schema-coverage.md.

This is not just a move

Because nothing ever validated the block, it had drifted into a state that could
not have worked. Moving it unchanged produces a schema error and breaks all
three tests:

jobs.moldb-count-rows.variables.options.properties.table: 'type' is a required property

test supply       would be missing required ['min_rows', 'max_rows']
test enumeration  would be missing required ['min_rows', 'max_rows']
test conformer    would be missing required ['count']

Three separate defects:

• required listed all four of table, count, min_rows, max_rows. But
  the command guards the last three with {% if ... is defined %}, and no caller
  supplies all four — count (an exact count) and min_rows/max_rows (a
  range) are alternatives. Every test would have failed.
• table had no type, which job-option-property requires.
• min_rows and max_rows were required but never defined.

So the block is relocated and corrected: only table is required, table
gains type: string, and min_rows/max_rows are properly declared.

Why the version bump

The Job could not previously be run from the Data Manager at all — with no
options visible there was no way to supply the table name its command needs. It
has only ever worked under jote, which passes options directly. Making the
options real is a behaviour change, so 1.0.0 → 1.0.1.

Sequencing

This unblocks closing hole 2 in the decoder (adding additionalProperties: false
to the job object). That closure would turn this silent no-op into a hard
failure, so the Job had to be fixed first — the lesson from decoder 2.7.0, which
closed a different hole and failed two unrelated merges.

Verification

jote 0.14.0 with decoder 2.7.0:

Manifest	Result
manifest-im-virtual-screening.yaml	32/32
manifest-moldb.yaml	12/12
manifest-fragnet-search.yaml	3/3
manifest-im-mordred.yaml	2/2
manifest-dmpk.yaml	1/1
manifest-silicos-it.yaml	0/0

Each of the three tests' supplied options was also validated directly against the
corrected options schema — all three pass.

Refs InformaticsMatters/squonk2-jobs#8.

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