feat(mcp): close Cloud tool coverage gaps

[joshrotenberg]

Summary

Close the remaining gaps between Cloud CLI commands and MCP tools. Cloud coverage is already strong (~95%), but a few operations are CLI-only.

Gaps

Cloud User management (P1)

Operation	CLI	MCP
List users	list	list_account_users
Get user	get	get_account_user
Update user	update	--
Delete user	delete	--

• update_cloud_user (non_destructive)
• delete_cloud_user (destructive)

Task polling (P1)

Operation	CLI	MCP
Get task	get	get_task
List tasks	--	list_tasks
Wait for task	wait	--
Poll task	poll	--

The CLI has wait (block until done) and poll (check periodically). For MCP, a single tool makes sense:

• wait_for_cloud_task -- poll a task ID until completion or timeout, returning final status. Include timeout_seconds parameter with sensible default (300s). This is valuable for agents orchestrating multi-step workflows (create subscription -> wait -> create database).

Cost Report export (P1)

Operation	CLI	MCP
Generate	generate	generate_cost_report
Download	download	download_cost_report
Export	export	--

• export_cost_report (non_destructive) -- export cost report in specified format

Cloud Provider Account (P2)

Note: provider accounts (BYOC) already have MCP tools via cloud_accounts in account.rs (list_cloud_accounts, get_cloud_account, create_cloud_account, update_cloud_account, delete_cloud_account). Verify these map correctly to the CLI's provider-account commands. If there's a distinction between "cloud accounts" and "provider accounts", add the missing variants.

Active-Active database flush (P2)

The CLI has flush-crdb as a separate command from flush. Verify whether flush_database covers both cases or if a separate flush_crdb_database tool is needed.

Acceptance criteria

• User update/delete tools added
• Task wait/poll tool added
• Cost report export tool added
• Provider account coverage verified
• CRDB flush coverage verified
• Wiremock tests for new tools

Context

Part of #681 (MCP epic). Cloud is the closest to full parity -- this closes the remaining ~5%.