chore: import upstream snapshot with attribution

tests/cli_e2e/slides/coverage.md

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+# Slides CLI E2E Coverage
+
+## Metrics
+- Denominator: 2 leaf commands
+- Covered: 1
+- Coverage: 50.0%
+
+## Summary
+- TestSlides_CreateWorkflowAsUser: proves the user slides workflow through `create presentation with slide as user` and `get created presentation xml as user`; creates a fresh presentation, asserts returned IDs, then reads back the XML content to prove the title and slide body persisted.
+- Blocked area: `slides +media-upload` is still uncovered because it needs a deterministic local image fixture plus XML follow-up proof that is separate from the base create/read workflow.
+
+## Command Table
+
+| Status | Cmd | Type | Testcase | Key parameter shapes | Notes / uncovered reason |
+| --- | --- | --- | --- | --- | --- |
+| ✓ | slides +create | shortcut | slides_create_workflow_test.go::TestSlides_CreateWorkflowAsUser/create presentation with slide as user | `--title`; `--slides ["<slide ...>"]` | read back through raw slides API to prove persisted XML |
+| ✕ | slides +media-upload | shortcut |  | none | needs a stable local image fixture plus follow-up slide XML proof |