Brummel
05ec3515f4
User's stance on the retirement question raised in 18f / 18g.2: keep the dual-allocator setup. Boehm = default, RC = validated alternative ready to flip. Re-opening trigger is operational (maintenance cost), not performance. Concrete consequences recorded: no default flip, -lgc stays, and Decision 9's 'transitional' framing should be re-cast as 'dual allocator' in a follow-up DESIGN.md edit (queued). Decision 10 holds as the canonical real-time path. The three RC-side debts from the 18g tidy remain queued and don't block the dual stance.