Update discount tests to flat per-tier values

The accrual is now a flat per-tier discount (S = 100% of the 300✦ base),
so all three tier-3 cases yield 300 regardless of approved amount. Also
retitled the "approve for less" test, which now verifies the discount is
unchanged by the approved amount rather than increased by it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: qcoral

test/models/certification/funding_request_test.rb

@@ -72,30 +72,30 @@ def setup
     fr.update!(reviewer: @reviewer, status: :approved)
 
     assert_equal "build", @project.reload.hardware_stage
-    # tier 3 (S) max $180, approved $60 => $120 unused * 2 = 240
-    assert_equal 240, @owner.reload.outpost_discount_stardust
+    # tier 3 (S) => flat 100% discount on the 300✦ Outpost Ticket = 300
+    assert_equal 300, @owner.reload.outpost_discount_stardust
     assert_equal Certification::FundingRequest::REVIEW_BOUNTY, fr.reload.stardust_earned
   end
 
-  test "reviewer can approve for less than requested, increasing the discount" do
+  test "approving for less than requested still grants the full flat tier discount" do
     fr = @project.certification_funding_requests.create!(
       user: @owner, complexity_tier: 3, requested_amount_cents: 10_000, status: :pending
     )
     fr.update!(reviewer: @reviewer, status: :approved, approved_amount_dollars: 40)
 
-    # approved $40 of $180 (S) max => $140 unused * 2 = 280
-    assert_equal 280, @owner.reload.outpost_discount_stardust
+    # flat per-tier discount: the approved amount no longer affects it; tier 3 (S) = 300
+    assert_equal 300, @owner.reload.outpost_discount_stardust
   end
 
   test "discount accrual is idempotent across re-saves" do
     fr = @project.certification_funding_requests.create!(
       user: @owner, complexity_tier: 3, requested_amount_cents: 6_000, status: :pending
     )
     fr.update!(reviewer: @reviewer, status: :approved)
-    assert_equal 240, @owner.reload.outpost_discount_stardust
+    assert_equal 300, @owner.reload.outpost_discount_stardust
 
     fr.update!(feedback: "nice work")
-    assert_equal 240, @owner.reload.outpost_discount_stardust
+    assert_equal 300, @owner.reload.outpost_discount_stardust
   end
 
   test "returned requests leave the project and discount untouched" do