Add TRG 11 — Generative AI guidelines (11.01 & 11.02)

[Copilot]

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The Eclipse Foundation FOSS governance (Project Handbook — Generative AI) requires that AI-assisted contributions be disclosed: substantial AI-generated code must be dual-licensed under CC0-1.0, commits must carry an Assisted-by: trailer naming the model, and projects should publish an AI usage policy. This adds a new TRG 11 family documenting those rules.

What's included

• docs/release/trg-11/trg-11-01.md — Generative AI usage and contribution. Allowed-usage conditions, the mandatory Assisted-by: <tool> (<model-version>) commit trailer, and the AI_POLICY.md recommendation (allowed/restricted/forbidden, recommended models, quality + test requirements).
• docs/release/trg-11/trg-11-02.md — AI disclosure and licensing in headers. The AI Disclosure block (minimally | largely | entirely), combined SPDX-License-Identifier (Apache-2.0 AND CC0-1.0 / CC-BY-4.0 AND CC0-1.0), and copy-paste header examples for code and non-code files.
• docs/release/trg-11/_category_.json — sidebar category "TRG 11 - Generative AI".
• sidebars.js — registers TRG 11 (autogenerated pattern) after TRG 10.

Key decisions

• Both files use the existing TRG .md structure (status table → ## Why → ## Description) and absolute /docs/release/... cross-links, matching TRG 7.02. Status is Draft.
• AI_POLICY.md is documented as a TRG 11.01 requirement rather than committed here, keeping scope to the requested deliverable. Can scaffold a concrete policy file in a follow-up if wanted.

How to review

• Read both TRG files; confirm the header examples and Assisted-by: format match the issue.
• Verify the TRG 11 entry renders in the Release Guidelines sidebar.

Compliance check

• markdownlint (repo .markdownlint.yaml): 0 errors on both files.
• sidebars.js loads via Node and contains release/trg-11; all internal link targets exist.

Example header introduced by TRG 11.02:

 * AI Disclosure: This file was [minimally | largely | entirely] AI-generated.
 * The AI-generated portions are made available under CC0-1.0 and not subject
 * to the project's license. The human contributor has reviewed and verified
 * that the code is correct.
 *
 * SPDX-License-Identifier: Apache-2.0 AND CC0-1.0
 * Assisted-by: GitHub Copilot (Claude-Opus-4.8-2026-06-16)

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