Declare marketdata, and document the second store the server now needs

[mspinola]

Companion to mspinola/cotmetrics#11, which repoints price reads from cotdata to marketdata under ADR-0007.

Measured: there is nothing here to repoint

The work order lists cot-analyzer as a consumer to repoint. As measured today it has zero get_prices calls and zero import cotdata — its coupling is a declared dependency plus a cotdata-update subprocess in pages/system/admin.py, and that subprocess stays exactly where it is, because COT production did not move.

So the change here is wiring and deployment, not code:

• pyproject.toml — declare marketdata>=0.1.0 beside cotdata
• requirements.txt — -e ../marketdata, same editable-sibling convention as the other two
• scripts/check_dep_floors.py — marketdata is an internal sibling and needs the same floor check

The deployment consequence, which is the part worth care

The server now needs MARKETDATA_STORE set and a second synced store. Without it, the price reads behind the indexer, the signal rejection scores and the options max-pain snapshot fail at the point of read.

Positioning and prices come from different packages now, so one store can be healthy while the other is absent. server-side/README.md gains that as a named symptom, because "COT works but prices do not" is not a shape this deployment could previously produce — previously one store meant one failure mode.

Also documented there:

• Both stores are synced, not produced on that box. It cannot produce bars at any Python version: norgatedata drives a locally installed Norgate Data Updater and NDU is Windows-only.
• They must stay separate roots. Each package keeps a manifest.json at its own root and does a read-modify-write on it, so merging them would have the producers dropping each other's entries.
• The rsync section gains the second push.
• The metrics-cache note is corrected: it busts on both upstream store versions now, and the reason is that the bump it was written for (reconstructed volume) was a price schema bump.

Testing

131 pass, ruff clean over src and tests (what CI lints). The internal dependency floor check passes with all three siblings installed:

cot-analyzer: internal dependency floors OK
  cotdata 0.3.0 satisfies '>=0.1.0'
  marketdata 0.1.0 satisfies '>=0.1.0'
  cotmetrics 0.3.0 satisfies '>=0.3.0'

scripts/max-pain.py has two pre-existing ruff findings; it is untouched here and outside CI's lint path.

Merge order

marketdata must be released or available as an editable sibling before this and cotmetrics#11 land together — the two are a pair, and cotmetrics#11 is the one that actually changes reads.

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