Add ort-release-notes skill to draft release notes

[edgchen1]

Description

Add an ort-release-notes skill with preset configuration, scoped path support, and a concise workflow for metadata generation and draft output.

Also include a lightweight docs entry point and WebGPU EP scoped paths file.

Motivation and Context

Make it easier for AI to generate release note drafts.

[Copilot]

Pull request overview

Adds a new ort-release-notes agent skill and supporting preset/path configuration to streamline drafting consistent ONNX Runtime release notes (full ORT or scoped component releases), plus lightweight documentation pointers.

Changes:

• Introduces the .agents/skills/ort-release-notes skill documentation and preset configuration (presets.json).
• Adds a WebGPU Plugin EP path-scope file (plugin-ep-webgpu/paths.txt) and documents it in the WebGPU plugin EP README.
• Adds a small docs entry point describing where the workflow/presets live (docs/ReleaseNotesWorkflow.md).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
plugin-ep-webgpu/README.md	Documents the new WebGPU EP paths.txt scope file for release-note generation.
plugin-ep-webgpu/paths.txt	Adds a path filter list intended for scoped contributor/release-note metadata generation.
docs/ReleaseNotesWorkflow.md	Adds a docs entry point that directs maintainers to the skill and presets.
.agents/skills/ort-release-notes/SKILL.md	Defines the release-notes drafting workflow and PowerShell command patterns.
.agents/skills/ort-release-notes/presets.json	Adds preset definitions (full ORT + WebGPU plugin EP) and output defaults.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.

Suppressed comments (1)

tools/python/compile_contributors.py:371

• --paths-file reading only catches OSError, but a non-UTF-8 (or otherwise undecodable) file will raise UnicodeDecodeError and crash the script with a traceback. Since this is user-facing CLI input, it should be surfaced as a clean argparse error like other file-read failures.

    if args.paths_file:
        try:
            selected_paths.extend(read_pathspecs_file(args.paths_file))
        except OSError as e:
            parser.error(f"Could not read --paths-file '{args.paths_file}': {e}")

[tianleiwu]

LGTM.
I can update the still to support cuda plugin ep later.