Fix sample data generator word count allocation

[kanejamison]

Problem:
test_content_respects_target_words was failing because generated content had only 136
words instead of the minimum 150 words expected (50% of 300-word target).

Cause:
Word allocation multipliers in default_content summed to 3.4, targeting only ~68% of
requested words. Combined with random variance, this fell below the 50% minimum
threshold.

Fix:
Increased allocation multipliers to sum to 5.2 (targeting ~104% of requested words):

• Old allocations: 0.5, 0.5, 0.4, 0.6, 0.5, 0.5, 0.4 → sum 3.4
• New allocations: 0.8, 0.7, 0.7, 0.9, 0.7, 0.7, 0.7 → sum 5.2

This ensures generated content stays within the test's 50%-150% acceptable range even with random variance.