Echo6 infrastructure documentation

echo6-autocommit db2d265c1d auto: docs sync 2026-08-03T18:00:05+00:00 ... Files changed: engine/lint-report.md		2026-08-03 18:00:05 +00:00
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engine	auto: docs sync 2026-08-03T18:00:05+00:00	2026-08-03 18:00:05 +00:00
vault	auto: docs sync 2026-07-18T12:00:17+00:00	2026-07-18 12:00:17 +00:00
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.gitignore
CLAUDE.md
credentials	auto: docs sync 2026-07-15T06:00:18+00:00	2026-07-15 06:00:18 +00:00