[williamloo-scale]

Stacked on #392.

A website env, and a multi env's websites, now get the same harness treatment as MCP servers:

• sync_env_clock syncs a website env's site and a multi env's websites; a site that doesn't follow the clock is tolerated. With main's timezone (feat(sync_env_clock): an optional timezone reads virtual_time in the zone and tells every synced server (FD-5003) #442), every synced server, website or MCP server, is told the zone, and a site that follows the clock but can't take the zone fails the step, as an MCP server does.
• snapshot_env exports each website child through its data plane; one without a data plane is skipped with a warning, and the step fails only if nothing is exported.
• A config broadcast (apply_server_config with "*") reaches websites, and skips one without a card or the extension, even in strict mode, so a multi env with an older site behaves as before.

legacy_protocol.backing_servers(env) lists MCP servers then websites; on a name clash the MCP server wins.

Test

Unit suite and protocol tests: 12,607 passed, lint clean.
tst/unit/task_step, tst/unit/env, tst/unit/providers: 5303 passed (one timing test in child_sessions_test.py, untouched here, flaked once and passes on rerun).

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge; no new blocking issue was found.

Summary

Adds websites to clock sync, state snapshots, and config broadcasts.

• Clock sync now reaches websites that follow the virtual clock.
• A broadcast config directive now reaches website servers too.
• Environment snapshots now include website state when it is available.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Environment definition] --> B[Backing MCP servers and websites]
  B --> C[Clock sync]
  B --> D[Snapshot]
  B --> E[Config broadcast]
  C --> F[Sync servers that advertise clock support]
  D --> G[Export state; warn for websites without a data plane]
  E --> H[Apply advertised config; skip unsupported websites]

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