Rename GraphDef -> GraphDefinition and Condition -> GraphCondition

[Andy-Jost]

Summary

Spell out abbreviations and apply the Graph* prefix convention to two
public classes in cuda.core.graph, in preparation for the v1.0.0 API.

• GraphDef -> GraphDefinition (cuda.core: public API class naming audit (PEP 8 and consistency) #1950)
• Condition -> GraphCondition (cuda.core: method/member/property naming audit #1945)

Changes

Public API

• Renamed class GraphDef to GraphDefinition in cuda.core.graph. Re-exported under the new name from cuda.core.
• Renamed class Condition to GraphCondition in cuda.core.graph. Re-exported under the new name from cuda.core.
• No backward-compatibility aliases (pre-1.0).

Internal

• Renamed source files cuda/core/graph/_graph_def.{pyx,pxd} to _graph_definition.{pyx,pxd} (history preserved via git mv).
• Renamed test files tests/graph/test_graphdef*.py to test_graph_definition*.py (5 files).
• Renamed internal test fixtures and helper symbols (sample_graphdef -> sample_graph_definition, etc.) for consistency.

Docs

• Added a "Breaking changes" entry in 1.0.0-notes.rst calling out both renames with issue refs.
• 0.7.0-notes.rst: switched two :class: Sphinx cross-references to literal inline-code form so they don't break in 1.0.0+ doc builds (text still factually says GraphDef; historical 0.7.0 snapshot at 0.7.0/ URL is unaffected).
• Updated docs/source/api.rst and all docstring references.

Test Coverage

• Full cuda_core/tests/graph/ suite passes locally (renamed test files exercised end-to-end).
• Editable build clean, pre-commit clean.
• No new warnings beyond pre-existing _FORTIFY_SOURCE notes from the build environment.

Related Work

• Resolves the GraphDef rename item in cuda.core: public API class naming audit (PEP 8 and consistency) #1950.
• Resolves the Condition rename item from the unified-conditional-API proposal in cuda.core: method/member/property naming audit #1945.
• The remaining items in those issues (e.g., if_cond -> if_then, create_conditional_handle -> create_condition, __int__ on GraphCondition, KernelAttributes indexed-property design) will land in follow-up PRs.

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