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.
Brummel
05ec3515f4