UKBatch 0.1.5-alpha

Fixed

• Scheduled jobs no longer fire twice. Two distinct duplicate-fire bugs were found and fixed:
  • Clock skew: the scheduler's timer could complete marginally before the wall-clock deadline (timer rounding, NTP slew), firing an occurrence early and then re-arming that same occurrence. The loop now re-checks the deadline after every wake and anchors the next occurrence no earlier than the one just fired.
  • Duplicate registration: a job registered explicitly through the builder under a custom name was registered a second time by attribute discovery under its attribute-derived name, arming its [Job(Schedule = ...)] cron twice. Discovery now skips any implementation type that is already registered — the explicit registration wins.
• A scheduler fire that fails to enqueue no longer strands a Pending execution row — the created row is compensated to Failed with a descriptive error.
• Lifecycle hardening for the scheduler and the runtime host: shutdown waits are bounded by ShutdownTimeout and honor the host's grace token; StartAsync is one-shot (a duplicate start is a logged no-op instead of doubling workers and leaking the stopping source); the linked stopping sources are disposed, safely even when the service provider is torn down before StopAsync runs; an abort during startup now reaches the worker loops.
• A flaky transport test raced CI load — the short-timeout request-reply test budget was widened; no production change.

Changed

• Cron documentation corrected. The documented schedule examples were five-field crontab expressions, which the six-field seconds-first default format rejects at startup. Examples are now six-field, the format is stated explicitly (with the CronFormat.Standard opt-in for five-field expressions), and the JobAttribute.Schedule API documentation describes the actual contract.
• The API samples run with a plain dotnet run — launch profiles pin the port and the Development environment (the development-only auth scheme refuses Production by design), and the readmes document the -f flag the multi-targeted samples require.
• The package readmes and the root README link the documentation website (https://nspukcode-hub.github.io/UKBatch/).