cbm_pagerank_compute's clamp used `damping < 0 || damping > 1` and
`epsilon <= 0`, both of which IEEE-754 NaN bypasses (every NaN
comparison is false). Since damping/epsilon became config-tunable and
cbm_config_get_double uses strtod (which parses "nan"), a
`config set pagerank_damping nan` would let NaN propagate through the
power iteration: every rank becomes NaN, the convergence check
`delta < epsilon` is always false (runs full max_iter), and the pagerank
table is silently corrupted, poisoning the search relevance sort.
Switch to the inverted-range form `!(damping >= 0 && damping <= 1)` and
`!(epsilon > 0)`, which reject NaN because the inner comparison is
false. Found by the silent-failure review agent; verified independently
(strtod parses "nan"; NaN bypassed the old clamp).
test_pagerank.c pagerank_nan_damping_is_clamped: a NaN damping must
yield finite ranks summing to ~1. Green: pagerank 44 passed.
Signed-off-by: Andrew Hundt <ATHundt@gmail.com>
Andrew Hundt
1087dfd846