feat(worker-rejoin-resync): wire config fields into xceadmin build (task 1.5)

Add workerResyncWindowMs/workerResyncTimeoutMs to xce.schema.json
(minimum:0, matching the optional-scalar-field precedent -- these
aren't `required` with a floor like heartbeatInterval, so minimum:1
would be wrong) and to mapping.py's YAML->capnp field table. Regenerate
both golden config-build fixtures (task 1.1 grew ClusterConfig's wire
layout by 2 fields; full/expected.bin and minimal/expected.bin each
grew by exactly 8 bytes). full's fixture YAML now sets real values
(900000ms/15000ms); minimal deliberately left untouched (no xce.yaml)
per its own locked-down "hosts+queues only" boundary test -- its
expected.bin still regenerates to reflect the new default-0 fields.
Two new tests assert specific decoded values, not just "build succeeds".

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y4M5MJM2zK6nU43da267Ku

src/xceadmin/tests/fixtures/full/configs/xce.yaml

@@ -4,3 +4,5 @@ heartbeat_interval: 30
 inactive_heartbeat_count: 3
 fetch_job_interval: 10
 netio_timeout: 30
+worker_resync_window_ms: 900000
+worker_resync_timeout_ms: 15000