chore: adopt the ADORSYS-GIS AI Governance kit

[stephane-segning]

1. Summary

Adopts the ADORSYS-GIS AI Governance kit:

• .github/ISSUE_TEMPLATE/{epic,user-story,dev-ticket,config}.yml — structured issue forms (blank issues disabled)
• .github/PULL_REQUEST_TEMPLATE.md — AI Usage Declaration / source-of-truth / verification / risk
• .github/workflows/governance.yml — advisory PR check, delegating to the reusable workflow pinned to the v1.0.0 release SHA 959d856 (not a movable tag)
• Governance stanza appended to CLAUDE.md, AGENTS.md, and a new .github/copilot-instructions.md (under the managed marker)
• CONTRIBUTING.md — an AI Governance section + PR-template pointer
• Created the epic / user-story / ticket labels the forms declare

2. Intent

Hold humans and assistants to the same bar — declared AI usage, a named source of truth, and real verification evidence on every change — without duplicating the doctrine in-repo (the stanza is intentionally thin and links to the site).

3. Scope

In Scope

• The canonical kit files, copied verbatim, plus a governance section in the existing CONTRIBUTING.md.

Out of Scope

• The kit's opencode.yml review caller — this repo already has .github/workflows/opencode-run.yml, so it's intentionally not added.
• Any change to publishing/CI gating behavior (the governance check is advisory, not a required status).

4. Verification

• Files copied verbatim from a fresh clone of the canonical kit (adorsys-gis/ai-governance@main).
• Workflow pin confirmed against the v1.0.0 tag SHA 959d8565041ddef86d3a10001b64393a6d4a60a2.
• epic / user-story / ticket labels created in this repo (forms only apply existing labels).

git clone --depth 1 https://github.com/adorsys-gis/ai-governance   # source of the verbatim files
gh label list --repo vymalo/opencode-oauth2                        # epic / user-story / ticket present

6. Risk Assessment

Risk level: Low — docs + issue/PR templates + one advisory workflow; no effect on build, publish, or existing CI gates.

7. AI Usage Declaration

AI was used for: Generating code/config (the integration), Drafting documentation (CONTRIBUTING section, this PR).

• I understand every meaningful change in this PR
• Kit files are verbatim copies from the reviewed canonical source
• I accept responsibility for this PR

Source of truth: https://adorsys-gis.github.io/ai-governance/

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[github-actions]

❌ AI Governance check failed

This PR description is missing the following governance requirements:

• a source-of-truth reference in the summary/intent — a URL or a #123 issue/PR reference (an evidence-only or boilerplate governance link does not count).

Please update the PR description using the pull request template and edit the PR body to re-run the check.

AI may accelerate the work, but it must not launder ignorance into polished artifacts.
See: https://adorsys-gis.github.io/ai-governance/

[gemini-code-assist]

Code Review

This pull request establishes an AI Governance framework by introducing structured GitHub issue templates (for Epics, User Stories, and Development Tickets) and a comprehensive Pull Request template. These templates enforce AI usage declarations, human verification, source-of-truth links, and verification evidence. Additionally, AI Governance guidelines and stanzas have been integrated into .github/copilot-instructions.md, AGENTS.md, CLAUDE.md, and CONTRIBUTING.md to define human accountability standards. There are no review comments on these changes, and I have no feedback to provide.

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