Workday adapter

[prPMDev]

Add Workday as a supported ATS platform. Paginated POST API, more complex than other adapters. Covers many large enterprises. Follow existing adapter pattern in src/adapters/.

[prPMDev]

Research finding (2026-04-24): Workday is implementable but brittle. Details:

• Pattern /wday/cxs/{tenant}/{site}/jobs works per-tenant
• BUT varies across Workday data centers (wd1, wd3, wd5…) with no predictable mapping
• /siteMap.xml discovery works on some tenants, not all
• Requisition ID format is inconsistent
• Not an official public API — it's reverse-engineered from their JS front-end

Implementation would require per-tenant detection logic (try multiple data-center prefixes, parse sitemap if available, fall back gracefully). Effort: medium-high, not the single-file simplicity of current adapters.

Recommendation: keep issue open but deprioritize. Shipping Recruitee + Personio + Workable + Teamtailor first (all simpler and together cover more companies) is a better use of adapter-development time.

See notes/expansion-research.md for full verified catalog of alternatives.