Stop paying five Redis round trips and a global lock per message

The engine was I/O-bound on its own state backend. `RedisState.lock()` is one
key — `pipeline:_lock` — for the whole process, taken five times a message at
two round trips each, and every cascade and every node read queued behind it.
Inside it, reading a node's inputs was three round trips per input (an EXISTS
for `in`, then EXISTS and GET for the value), writing was two updates that a
single transaction already gives, and the version counters went one INCR at a
time.

Replaced with the atomic command that was always available: `get_present` is
one MGET and tells a missing key from one holding null, so the lock it used to
be read under bought nothing; value and timestamp land in one `update`, which
is a MULTI/EXEC; `increment_multi` pipelines the counters. `values()` — what
every websocket snapshot calls — is two reads whatever the message count
instead of two per message.

Beside that: every webhook did its blocking XADD on the asyncio event loop
(MQTT already used `to_thread`); the per-execution `NodeOutcome` was built and
validated even with no run watching; `_minute` built a tz-aware datetime per
event on the loop thread to key a dict, and now keys on an int; `move_due`
promoted delayed items one round trip each, every second; `FLOW_MAX_CASCADES`
makes the in-flight ceiling a setting rather than a constant.

`orjson` replaces stdlib json where a message pays for it — state, the
journal, the engine side of the worker pipe. `fluksio-worker` stays
dependency-free, and the run-cache digest stays on stdlib so no stored key is
invalidated. A non-finite number now stores as `null` rather than the bare
`NaN` that was never JSON.

Measured with `scripts/bench_engine.py` against a real Redis, 200 messages:
a five-node chain went from 43.9 to 103.1 msg/s with p50 latency 2110ms →
782ms and p95 3913ms → 1439ms; one source into twenty consumers went from 5.4
to 33.7 msg/s. In memory, twenty consumers went from 187 to 448 msg/s.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BpfSinyCBfjuieikyfMPbf

uv.lock

@@ -885,6 +885,7 @@ dependencies = [
     { name = "jinja2" },
     { name = "mcp" },
     { name = "numpy" },
+    { name = "orjson" },
     { name = "pwdlib", extra = ["argon2", "bcrypt"] },
     { name = "pydantic" },
     { name = "pydantic-settings" },
@@ -922,6 +923,7 @@ requires-dist = [
     { name = "jinja2", specifier = ">=3.1.4,<4.0.0" },
     { name = "mcp", specifier = ">=1.29,<2" },
     { name = "numpy", specifier = ">=2.2.6" },
+    { name = "orjson", specifier = ">=3.10" },
     { name = "pwdlib", extras = ["argon2", "bcrypt"], specifier = ">=0.3.0" },
     { name = "pydantic", specifier = ">2.0" },
     { name = "pydantic-settings", specifier = ">=2.2.1,<3.0.0" },
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