SIA v1.5.2 — the instruments spoke, the policy moved

The first execution of the roadmap's self-study phase. The nightly tripwire warning was investigated with a full three-system decomposition; the probe set grew from 13 to 22 organ-gated probes; and on the extended set the associative rerank measured uniformly below plain dense retrieval — so, per the hypothesis-lane freeze rule, it now ships default-off behind retrieval.associative_rerank, with the numbers and the re-promotion condition recorded in WHITEPAPER §4.3. The rehearsal-efficacy instrument (sia memory --efficacy) ships with its first datapoint, the calibration lane is unblocked (the configured codex judge was refused by design; claude is now configured and the first live grading pass ran, honestly UNRESOLVABLE), and sia take --help no longer registers a take. See CHANGELOG for the full record.