Layers the non-superseded part of epic soc-etwf onto the DDD/hexagonal PR.
The RPI-leanness council (.agents/council/2026-05-15-rpi-leanness-council.md)
found context-shards is dead infra and the loop has no context budget.
soc-etwf.4: new scripts/validate-context-budget.sh — fails a slice plan over
the 8 KB packet budget or a worker prompt that embeds a full plan; --self-test.
soc-etwf.5: gate context-shard generation behind explicit --large-repo mode in
rpi SKILL.md + context-windowing.md — the 1.1 MB latest.json was generated
but never consumed by the default path (1 dead artifact -> 0 on default path).
soc-etwf.6 (loop token measurement) stays deferred — it measures the merged
result. self-test PASS; rpi validate + run-all + markdownlint clean.