CHANGELOG.md and CONTRIBUTORS.md both referenced #10590, which is an
open PR not an issue. The correct issue is #8616. Also removed the
duplicate ### Added heading in CHANGELOG.md that preceded the entry.
CONTRIBUTORS.md now references PR #11106 / issue #8616.
ISSUES CLOSED: #8616
Implement the ContextStrategy Protocol for pluggable context assembly strategies
in the ACMS pipeline. Includes six built-in strategies, a StrategyRegistry service
with plugin discovery support, thread-safe operations, and comprehensive BDD tests.
ISSUES CLOSED: #10590