feat(profile): add Copilot profile adapter

[christso]

Summary

• isolate Copilot profiles with selected COPILOT_HOME and COPILOT_CACHE_HOME roots while preserving project discovery through launcher cwd
• materialize strict settings, MCP configuration, files, plugins, and authoritative marketplace registrations
• delegate native plugin lifecycle to Copilot CLI 1.0.74+ with version gating, exact inventory parsing, dry-run isolation, and provenance-safe cleanup

Verification

• bun test — 1691 pass, 6 skip
• bun run test:e2e — 142 pass, 4 skip
• bun run typecheck
• bun run lint
• bun run build
• bun run docs:build
• final focused review: no remaining P0-P2 findings

Manual E2E

Using the built CLI and real Copilot CLI 1.0.83 in a temporary HOME/workspace:

1. ./dist/index.js profile install copilot-dogfood --dry-run --yes left the selected profile root absent.
2. ./dist/index.js profile install copilot-dogfood --yes installed compound-engineering@compound-engineering-plugin only in the selected profile and left the default Copilot inventory empty.
3. The generated launcher preserved project-specific skill discovery across two separate repositories while retaining profile-only skills.
4. copilot mcp list --json through the launcher consumed the generated mcp-config.json; ${DOGFOOD_TOKEN} remained unresolved on disk. A live prompt invocation reached the authenticated Copilot service but was blocked by the test account's monthly quota.
5. ./dist/index.js profile status copilot-dogfood reported every managed resource unchanged.
6. ./dist/index.js update --profile copilot-dogfood reconciled a changed setting and targeted native plugin refresh without modifying either project.
7. ./dist/index.js profile remove copilot-dogfood --yes removed the launcher, owned files, native plugin, managed marketplace registration, state, and disposable client root while preserving both projects and the default Copilot inventory.

Related: #460

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