fix(cli): pass graph export EDN options directly - #13200

Summary

• Pass --edn-options directly to thread-api/export-edn, preserving the worker's top-level option structure.
• Add the default :export-type :graph only when callers omit :export-type.
• Update the help text, examples, and CLI documentation to show explicit :graph-options for :graph-human.
• Add payload-level regression coverage and a real selected-nodes CLI E2E case.

Why

As reported in #13071, the previous export_payload implementation kept :export-type at the top level but wrapped every other key under :graph-options. The worker's build-export function reads :block-id, :page-id, :rows, and :node-ids from the top level, so selected-node exports received nil and could report success while writing an empty :pages-and-blocks result.

This follows the suggested fix from the issue: remove that generic wrapper and forward the EDN options map directly. The CLI still inserts :export-type :graph when it is omitted.

I reproduced the original behavior on the latest master before making the change: the source block was queryable, the export command exited successfully, but the generated EDN contained an empty :pages-and-blocks [].

Verification

• The new payload regression assertion failed before the production change because top-level :node-ids was missing, then passed after the fix.
• The new real CLI E2E imports a block with a fixed UUID, exports it through :selected-nodes, and verifies that the output contains the block text.
• Full non-sync CLI E2E: 91/91 passed.
• CLI test suite: 237/237 passed in a no-space temporary path.
• CLI E2E harness unit tests: 83 tests / 317 assertions passed.
• git diff --check passed.

Compatibility note

:graph-human customization now follows the worker's native contract and must be supplied explicitly under :graph-options, for example:

{:export-type :graph-human :graph-options {:include-timestamps? true}}

The CLI help, examples, and documentation are updated accordingly.

AI assistance

I used AI-assisted tools to help analyze the CLI/worker contract, implement the change, design regression coverage, and run verification. I reviewed the resulting diff and validated the fix with a real CLI export before opening this PR.

Fixes #13071