Runway — real-data ergonomics & honesty hardening

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Cheap, high-corroboration hardening of the real-data ingestion seam before the next headline milestone (realistic-broker C7/C10 vs compare+visual-face C21/C22). Groups: #80 Timestamp-window M1FieldSource::open, #81 open_default_archive + re-export DataServer/DEFAULT_DATA_PATH, #92 canonical 4-source OHLC opener (C4 merge order), #93 ts-join for multi-tap recorder traces, #22 minimal per-instrument pip metadata Source (NOT Aura.toml), #73 flat-run-registry fork, #82 two-store Registry::open rustdoc. Close before re-deciding A/B.

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