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Cross-client support (Cursor / Windsurf / VS Code) was blocked on Claude's layout being hard-coded throughout the code: servers always under the literal "mcpServers" key, a fixed set of Claude file locations, and "which client is this?" answered by sniffing a filename. Adding a client that differs on any of those axes meant chasing those assumptions through a dozen sites. This is phase 1 of #5: the keystone refactor, with NO behaviour change. It adds a ClientSpec adapter that captures the three things that vary across clients -- the top-level servers key, the config discovery paths, and the per-server value shape -- plus the capability flags that were previously computed inline from a filename (does the client expand ${VAR}? can we offer Restart?). - ClientSpec (frozen dataclass): servers_key, disabled_key, config_filename, expands_env_refs, supports_restart, and entry_to_internal/entry_from_internal -- the per-server translation seam, identity for any mcpServers-shaped client, the single point a differently-shaped client (VS Code's type/inputs form) overrides. - CLAUDE_DESKTOP and CLAUDE_CODE specs; both use mcpServers + the existing parking key, so their translation is the identity and nothing changes for today's users. resolve_client(path) reproduces the old filename rule exactly; each Profile now carries its resolved .client. - extract_servers / apply_servers / _server_sections / external_change_summary take an optional spec and default to Claude's layout, so every existing call site and test that omits a spec is byte-for-byte unchanged. The cardinal rule now generalises: apply_servers only ever writes the client's own two keys, parameterised rather than hard-coded. - profile_targets_claude_desktop and client_expands_env_refs are now thin reads off the profile's spec -- one source of truth for client identity instead of scattered filename checks -- with identical answers. - GUI: the load, Copy-to, save and stale-merge paths pass the profile's spec into the core calls. Mechanical; no logic moved into bcc.py (which CI can't test -- no PySide6). Tests: +14. Existing suite unchanged and green (behaviour preservation). A synthetic non-mcpServers spec ("servers" key, a different disabled key, a per-server `type` field) exercises the whole pipeline -- extract, apply, masking, external-change diff -- proving the seam actually generalises before any real client depends on it. 458 passed, 1 skipped; ruff clean. Refs #5 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EKwBecy6N83jnqQmw8ezwE