Issue #205 shows the UUID-prefixed pattern's own reference device
(TP2X_FAC_BORA_21K) doesn't always answer /<uuid>/device/0, contrary to
what the pattern was built against. When that Collection GET comes back
empty, enumerate_subdevices now probes every href the master itself
answered this cycle individually under the UUID prefix, keeping whichever
ones respond. Subdevice gains a flat_hrefs field for this, and the
coordinator re-polls those hrefs individually each cycle instead of
re-fetching a Collection batch that doesn't exist.
Built a fixture from the reporter's real #205 diagnostics dump: the
fallback finds a candidate through the one href already confirmed live
under this UUID (/information/vs/0, from the #177 thread), and
discover_partitioned's liveness gate correctly holds it back since that
href alone binds no entity -- honest current state, not a guessed
resolution.