feat(onboarding): complete v0.8 onboarding coverage

[typelicious]

What changed

• add delegated OpenClaw request starter and generic AI-native app client profile starter
• extend onboarding integration examples to cover many-agent/delegated traffic and future app profiles
• update the roadmap status to reflect the current v0.8 onboarding line

Why

• close the remaining v0.8 onboarding gaps around delegated traffic and future AI-native applications
• make the release line complete enough to cut v0.8.0 after this PR

How verified

• PYTHONPYCACHEPREFIX="$PWD/.pycache" python3 -m compileall foundrygate tests
• PYTHONPATH=. ./.venv-check-313/bin/pytest -q tests/test_onboarding.py
• ./.venv-check-313/bin/ruff check foundrygate/onboarding.py tests/test_onboarding.py README.md docs/ONBOARDING.md docs/INTEGRATIONS.md docs/FOUNDRYGATE-ROADMAP.md CHANGELOG.md
• git diff --check