Add opt-in per-integration MCP search tools

[RhysSullivan]

Adds a per-connection MCP option, off by default, mirroring the artifacts flag: ?search_tools=true (stdio: executor mcp --search-tools) registers one minimally-described search_<integration> tool per connected integration. The point is to put the integration namespaces into the model's context as tool names; each call routes through the same flow as tools.search({ namespace }) inside execute, and the tool list is parsed from the same inventory block the execute description carries, so the two surfaces cannot disagree.

• Reader + threading mirror ?artifacts= end to end (cloud + host-cloudflare DOs incl. session meta for cold restores, local, selfhost in-memory store, CLI stdio bridge).
• Install card gets an Advanced toggle; only the non-default reaches the URL/command.
• Tests: unit coverage for the parser, reader, registration, and dispatch; e2e scenario namespace-search-tools (passing on selfhost) proves the comparative surface and that results match code-side search.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	executor-marketing	e52600e	Commit Preview URL Branch Preview URL	Aug 25 2026, 08:51 PM