Add four agent skills: expense report, time tracking, worker data quality, learning enrolment - #25

What this PR adds or changes

Four more agent skills in the same shape as the five merged in #24. Each one names the exact Workday operations it
relies on, treats every change as a proposal that a person approves, and lists what the agent must refuse.

• expense-report-agent-skill: find the real expense item for each line, prepare a report, cancel one not yet approved
• time-tracking-agent-skill: read calculated time, look up the time entry code, prepare reported hours for one worker and one day
• worker-data-quality-agent-skill: find workers with missing personal data through read-only WQL, prepare a date of birth correction
• learning-enrolment-agent-skill: find a course by its Workday ID through WQL, prepare one enrolment per learner

Checklist for new or changed examples

• The example lives entirely in its own folder under examples/
• node scripts/validate-examples.mjs --check passes (valid example.json, README present, index table in sync)
• The README says what the artifact is, how to use it, and what to change before deploying it (the "Before you deploy" section)
• No credentials, tenant names, or real personal data anywhere in the folder
• node scripts/audit-examples.mjs --changed passes, or the findings it reports are explained below

Anything reviewers should know?

• The audit was run with --skip-arcane (hub rules only); the folders hold markdown and JSON, no Extend source.
• What is new compared with Add five agent skills for governed changes: undo, inbox, time off, rewards, WQL analyst #24: each README's "Tested how" line now says which operations I ran on a development
  tenant on 11 November 2026 and which I did not. The REST and WQL reads ran. The SOAP writes follow the published
  definitions and were not run to completion.
• One thing the test showed that may help others: on GET /expenseItems the filter that works is searchString.
  A search parameter is ignored and every item comes back.
• WQL is listed under "Workday REST API" in example.json because it is not in the approved product list.

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