docs: document missing sync-status input

[Copilot]

sync-status was added in v1.3.1 (present in action.yaml and src/main.ts) but never documented in the README.

Changes

• Added ### \sync-status`section to README under **Action Inputs**, afterwait-timeout-seconds`
  • Clarifies it mirrors the triggered run's failure/cancellation status onto this action
  • Notes the wait-for-completion: true dependency
  • Documents the default (false)

Example

- uses: benc-uk/workflow-dispatch@v1
  with:
    workflow: My Workflow
    wait-for-completion: true
    sync-status: true  # fail this step if the triggered run fails or is cancelled

Original prompt

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This section details on the original issue you should resolve

<issue_title>The new "sync-status" input is undocumented</issue_title>
<issue_description>1.3.1 added the sync-status input with there is no mention of it in the README.</issue_description>

<agent_instructions>the readme is out of sync with the inputs this action accepts</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes The new "sync-status" input is undocumented #91

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