Fix organisation tech level never increasing (#1587)

[andremmfaria]

Fixes #1587.

Root cause: Organisation::tech_level is set once by the extractor and never changes at runtime. GameState::updateEndOfWeek has a per-organisation finance loop but nothing for tech level, so every organisation stays at its starting level for the whole game. The original game raises each organisation's tech level by 1 per week, capped at 12.

Fix: in updateEndOfWeek, when not gameStart, increment tech_level for every organisation except player, aliens, and civilian, capped at the highest min_score among Human EquipmentSets (12 with the shipped data) instead of a hardcoded constant. The separate "+3 on full infiltration" rule is not part of this change.

Verification

• Pre-fix headless harness: all 25 non-exempt organisations unchanged after a week (ORG_CULT_OF_SIRIUS tech_level 2 -> 2, expected 3).
• Post-fix: weekly +1 with exemptions, cap holds at and beyond the derived value, gameStart week leaves levels untouched.
• Full ctest green (RelWithDebInfo, Linux); fork CI Lint + CMake green.

Harness core in the comment below.

[andremmfaria]

Temporary harness used for the before/after check (not committed). Loads difficulty0 like test_lab_assignment and runs one real weekly tick:

int maxOrgTechLevel = 1;
for (auto &es : state->equipment_sets)
	if (es.second->type == EquipmentSet::Type::Human)
		maxOrgTechLevel = std::max(maxOrgTechLevel, es.second->min_score);

std::map<UString, int> before;
for (auto &org : state->organisations)
	before[org.first] = org.second->tech_level;
state->updateEndOfWeek(false);
for (auto &org : state->organisations)
{
	bool exempt = org.first == state->getPlayer().id || org.first == state->getAliens().id ||
	              org.first == state->getCivilian().id;
	int expected = exempt ? before[org.first] : std::min(before[org.first] + 1, maxOrgTechLevel);
	assert(org.second->tech_level == expected);
}
assert(EquipmentSet::getForType(*state, EquipmentSet::Type::Human, maxOrgTechLevel));
assert(EquipmentSet::getForType(*state, EquipmentSet::Type::Human, maxOrgTechLevel + 5));

for (auto &org : state->organisations) before[org.first] = org.second->tech_level;
state->updateEndOfWeek(true);
for (auto &org : state->organisations)
	assert(org.second->tech_level == before[org.first]);

Pre-fix (727cd974):

E Org 'ORG_CULT_OF_SIRIUS' tech_level 2 -> 2, expected 3
E Weekly increment test failed

Post-fix (b69d29a3): all checks pass, derived cap = 12.

[FilmBoy84]

Really nice catch!
Will be great to have organisation tech advancing once more
Thanks as always 🍻