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feat: send mining.extranonce.subscribe + handle set_extranonce (TA-306) (#281)

* feat: send mining.extranonce.subscribe + handle set_extranonce (TA-306)

post-authorize, when the active slot's extranonce_subscribe pref is
on, the firmware sends mining.extranonce.subscribe and tracks the
request id. response observation flips a per-session runtime status:

  off → user pref disabled for the active slot
  pending → subscribe sent, awaiting response
  active → pool returned success result
  rejected → pool returned error or non-true result

status resets to OFF on every reconnect (along with the in-flight id).
the user pref in NVS is never auto-disabled by a network response —
per workspace decision, a remote-controlled signal must not silently
mutate user-configured state. user pref + observed reality are
displayed as two distinct things.

inbound mining.set_extranonce ([en1_hex, en2_size]) updates s_state
in place; ASIC re-feed picks up the new values on the next 500ms
extranonce2_roll. in-flight ASIC work prepared with the old en1 may
get rejected as stale by the pool — acceptable, work loop is short.

UI badge surfaces status next to the toggle on the active slot only
(off pool: hidden, since the subscribe hasn't been sent for that
slot in this session).

8 new host tests cover the set_extranonce parser; routes_json golden
strings updated for the new top-level field.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* test(routes_json): cover extranonce_subscribe_status switch arms

build_pool_json's status->string switch had three uncovered arms
(pending, active, rejected) — every other test sets status=0=off.
Three small tests exercise each non-default value and assert the
emitted JSON string. closes the diff coverage gap on PR #281.

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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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