Document dynamic steps and steps with large payloads

[jamescmartinez]

documents dynamic steps and steps with large payloads

more context in #271

[codecov]

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[Copilot]

Pull request overview

Updates OpenWorkflow documentation to address two common workflow design questions: running a runtime-dependent (dynamic) number of steps and handling steps that would otherwise persist very large results.

Changes:

• Adds a new Dynamic Steps guide describing deterministic step naming for steps created in loops/maps.
• Extends the Steps guide with guidance for Large Payloads (store references, not large results).
• Wires the new Dynamic Steps page into the docs navigation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/docs/docs/steps.mdx	Replaces the step-name warning with a dynamic-steps note; adds a “Large Payloads” section.
packages/docs/docs/dynamic-steps.mdx	New page documenting how to safely create a variable number of steps using deterministic names.
packages/docs/docs.json	Adds the new Dynamic Steps page to the “Guides” navigation group.