Adds a 'Host integration' section to the ACP guide and a row in the
environment variable reference so the next ACP host implementer does not
have to read the adapter source.
Documents the exact contract the tests already pin: the value must be
exactly `1`; unset/empty/`0`/`false` keep the default behavior; only
globally configured config.yaml MCP discovery is skipped, and servers
supplied by the ACP session through session/new are still registered.
Framed as a host-set process marker rather than user configuration - the
same shape as the existing HERMES_KANBAN_TASK entry - so it does not read
as a behavioral setting that belongs in config.yaml.
Co-authored-by: amanning3390 <adam.manning@pro-serveinc.com>
Signed-off-by: amanning3390 <adam.manning@pro-serveinc.com>
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