[WIP] web: collapse triplicated share_version switch in rest_web_currency_info

[frstrtr]

Refactor: collapse three duplicated share_version switch blocks into one in rest_web_currency_info. Behaviour-preserving. Draft for CI.

[frstrtr]

Closing as OBSOLETE — superseded by #491 (9445b46b), and merging this would be a regression.

This branch was authored 2026-06-23 and is 863 commits behind master. Since then, 9445b46b ("web(currency_info): report LIVE ratchet share_version, not static 36", #491) already collapsed the triplicated switch (m_blockchain) in rest_web_currency_info — and did it better.

Master today:

default:  result["share_version"] = m_cached_share_version;  break;

This branch:

default:  result["share_version"] = 36;  break;

The difference is not cosmetic. Master's own comment states why: during the V35→V36 cross, a node that is still VOTING is producing V35 shares, so reporting a static 36 "would make the explorer misclassify live V35 share cells as V36 — a lie about the crossing state."

So resolving this branch's conflict in its own favour would reintroduce exactly the dishonest-surface defect this lane exists to eliminate. The dedup goal is already achieved on master; nothing here remains to land.

No action needed on the other CI signals — the attribution-gate FAILURE shown in the rollup is a stale first run from 2026-06-23T23:06 on SHA 2a0b1270; the same gate re-ran green twice on that same SHA at 23:20 and 23:53.