feat(identity): add stateless GitHub OIDC provider

[aparragithub]

Closes #199

Type

• Bug fix
• New feature
• Documentation only
• Code refactoring
• Maintenance/tooling
• Breaking change

Summary

• Add a stateless GitHub OIDC provider satisfying the neutral identity port.
• Translate only accepted neutral identity fields and keep session resolution unsupported.
• Preserve an explicit fail-closed boundary until JOSE verification lands in PR 3.

Changes

File	Change
src/odoo_forge_identity_github/provider.py	Stateless provider and neutral translation
src/odoo_forge_identity_github/__init__.py	Provider exports
tests/identity_github/test_provider.py	Provider contract and exclusion tests

Test plan

• Provider and transport tests — 24 passed
• Full pytest — 1949 passed, 46 deselected
• Ruff lint/format, mypy, and import-linter passed

Chain context

Strategy: stacked to main.

main → PR 1 transport ✅ → 📍 PR 2 provider → PR 3 JOSE validation

This PR starts from merged transport PR #201 and ends at the explicit pre-JOSE rejection boundary. PR 3 depends on this merge. JOSE/signature verification remains out of scope. Rollback removes the provider module, exports, and provider tests.

Contributor checklist

• Linked approved issue
• Added exactly one type:* label
• Applicable checks passed
• Tests remain with implementation
• Conventional commit format
• No AI attribution or co-author trailer

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📥 Commits

Reviewing files that changed from the base of the PR and between 7929284 and bde0c50.

📒 Files selected for processing (3)

• src/odoo_forge_identity_github/__init__.py
• src/odoo_forge_identity_github/provider.py
• tests/identity_github/test_provider.py

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