feat(sandbox): persistent per-user container with Docker Exec (#7732 Step 1) - #7751

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feat/7732-user-sandbox-exec

Commits on Aug 19, 2026

docs(internal): sandbox egress spike results + iron-proxy fixtures (#7732 Step 0)
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501799e
feat(sandbox): persistent per-user container with Docker Exec (#7732 Step 1)
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91e0836
fix(sandbox): harden persistent user-container lifecycle (#7751 review)
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0b46edb
fix(sandbox): close lifecycle and process-isolation review gaps (#7751)
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12c3faa
fix(sandbox): keep launch-config unit tests daemon-independent (#7751)
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d96a6ac
docs(sandbox): clarify idle cleanup authority (#7751 review)
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ed76344
fix(sandbox): launch resolved immutable worker image (#7751 review)
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cb65f7f
test(sandbox): document daemon-free launch config fixtures
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6e00f17
fix(sandbox): preserve request preflight before image resolution
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456979a
test(sandbox): assert immutable image identity after recycle
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ccfba3f