fix: linear init ramp and mutex-safe drop replacement#4
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Replace the parabolic spawn-delay countdown with a 15s linear ramp: (max_col_drops - 1) / 15 drops per second, with random stagger between spawns. Guard column deactivation and replacement spawn in one cmatrix_spawn_mx critical section (finish_column_and_replace). Drop the racy active_col_count counter; derive the active pool size from column_active[] under the lock so concurrent worker completions cannot skip replacement spawns over long runs.
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Summary
(max_col_drops - 1) / 15drops/sec, randomly staggered.cmatrix_spawn_mxviafinish_column_and_replace().active_col_countcounter; derive active pool size fromcolumn_active[]under the lock.Test plan
make clean && make./cmatrixfor several minutes and confirm active drop count stays near 66% of terminal width