[lex]

Adds Bloom, a Danger Ores map that combines #1651 (Petals, sector sizes change with the distance from spawn) and #1652 (Riches, sector richness changes with it). Bloom goes halfway on each, so it allegedly gives the same ore at every distance as either of them, with sectors that bend half as much as on Petals and are half as lean or rich as on Riches.

Why

It's the same model as the other two: research and building allegedly use mostly iron within ~200 tiles of spawn, and rockets allegedly use mostly copper and coal out to ~410 tiles. The numbers come from Factorio 2.0.77's recipes but rest on a lot of assumptions, so treat them as a starting point for playtesting, not as fact.

Petals gets there with sector sizes alone, so its sectors bend a lot; Riches gets there with richness alone, so its iron sector ends up very thin far out (×0.30). Splitting the change between both keeps each one milder.

How

The ore a sector gives at some distance is its size times its richness. Each axis goes about halfway (√ of the full change), blended from r=200 to r=350 like the other two:

	Iron	Copper	Coal
Sector size inside 200 tiles	42%	30%	28%
Sector size past 350	19%	45%	36%
Richness inside 200 tiles	×1.21	×0.87	×0.82
Richness past 350	×0.53	×1.22	×0.97

Because both blends ease at the same time, rings in the middle of the blend hold allegedly up to 6% less ore than on the standard map; inside 200 and past 350 it's the same. The mixes and the ~10% stone in them are the canonical ones.

• presets/danger_ore_bloom.lua: main_ores_radial from Add the Danger Ores Petals map #1651 with the sizes above and two of each sector (six spokes; the sizes change half as much as on Petals, so wider sectors stay spokes), plus radial_richness from Add the Danger Ores Riches map #1652 on Factory.default() with the richness above.
• Scenario template, map poll entry, changelog line, preview.
• radial_richness now defaults its base to the canonical richness curve, which the ore factory exposes as default_value, so Riches and Bloom no longer declare it again. Neither map changes.

Tests

• danger_ore_bloom_tests.lua (runs when Bloom is the active map): the sectors, built by the real radial builder from the preset's config, times the richness read from the preset's ores, give each ore its fitted share within 1 point near spawn and far out; and rings in the blend hold at most 6% less ore than the standard map, never more. Changing one size or richness number fails them.
• radial_richness_tests.lua: a curve given no base scales the standard richness.
• The tests of both modules run on this template too.
• pwsh .github/scripts/run-tests.ps1 <factorio> danger-ore-bloom: 162 passed, 0 failed, 43 skipped (need a player); danger-ore-riches: 151 passed, 0 failed. luacheck .: 0 warnings / 0 errors.

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