docs: add project-specific technical poem

POEM.md

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+# A Vault for Honest Work
+
+At midnight, the marketplace hums in blue,
+where clients pin their tasks like stars.
+A worker signs in, the dashboard wakes,
+and guarded tokens sleep behind the bars.
+
+No secret shouts from open code,
+no payment drifts as nameless smoke.
+The intent is shaped, the amount is checked,
+then Stripe returns the client-secret note.
+
+A banana stands beside the vault,
+bright as a warning, calm as a key.
+It keeps the small things serious:
+metadata clean, errors honest, tests set free.
+
+Messages cross the quiet wire,
+reviews arrive with careful light.
+Each proposal, job, and notification
+keeps its ledger through the night.
+
+So let the bounty board remember
+that trust is built in patient parts:
+one route, one test, one guarded field,
+one secure payment for honest hearts.
+