feat(install-mcp): add openclaw host adapter

[jsdevninja]

What changed

Adds adapters/openclaw/ — a ninth host in the vouch install-mcp adapter
catalogue, alongside a generic-discovery test for its full T1-T4 install,
idempotency, and that its T3 slash commands are byte-identical to
claude-code's (proving reuse, not a fork).

Closes #230

Why

vouch install-mcp openclaw currently fails — only eight hosts are
registered. OpenClaw needs the same manifest-driven adapter experience
Claude Code users get: a one-command writer that drops plugin-enablement,
docs, slash commands, and policy into a managed project. Closes #230.

What might break

Nothing. No .vouch/ on-disk shape changes, no kb.* method changes —
this is purely a new adapters/<host>/ template directory plus its
manifest, discovered generically by the existing install_adapter.py
writer. Existing hosts are untouched.

VEP

Not a surface change — no VEP needed.

Tests

• make check passes locally (lint + mypy + pytest)
• New / changed behaviour has a test
• CHANGELOG.md updated under ## [Unreleased]

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[plind-junior]

Openclaw is not urgently needed and I will take a look after checking other PRs

[plind-junior]

@codex review

[chatgpt-codex-connector]

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