[DOCS] Update inventory docs for 12+ clients (stale four-client copy)

[hello-args]

Summary

Refresh user-facing docs that still list only Cursor, Claude Desktop, VS Code, and Windsurf.

Problem

src/mcts/inventory/client_registry.py registers 12+ clients. docs/platform/cli.md and docs/scanning/inventory.md still describe four clients in places.

Additional doc gaps (validated 2026-06-17):

• docs/scanning/inventory.md shows --config-path ... --scan-all without noting that --redact-paths does not apply to scan-all JSON export until [FEATURE] Wire --redact-paths through inventory --scan-all JSON export #288 is done.
• Privacy flag interaction matrix (--paths-only conflicts, no -o) should stay in sync with cli/main.py.

Expected Behavior

Docs match client_registry.py and the inventory command docstring ("12+ agent clients"). Privacy examples accurately state redaction scope per SECURITY.md.

Evidence

• docs/platform/cli.md — inventory section ("Cursor, Claude Desktop, VS Code, Windsurf")
• docs/scanning/inventory.md — entry table examples, privacy commands section
• SECURITY.md — Inventory Privacy

References

• [FEATURE] Wire --redact-paths through inventory --scan-all JSON export #288 — scan-all redaction wiring
• [SECURITY] mcts inventory reads local MCP configs without consent gate #87 / PR feat(inventory): add privacy controls for config discovery (#87) #279

Acceptance Criteria

• Client list and examples updated for 12+ clients
• Path tables per platform remain accurate
• --redact-paths + --scan-all limitation cross-linked to [FEATURE] Wire --redact-paths through inventory --scan-all JSON export #288 until fixed
• Flag interaction matrix matches CLI behavior