Follow-up to the salvaged #111004 commit, aligning it with the shape agreed
on #110995:
- Drop the HERMES_KANBAN_DISPATCH_PROFILES env bridge: non-secret behaviour
lives in config.yaml only, like every other kanban.* key.
- Read the key via load_config_readonly() with the same fail-open config
read as the sibling kanban.* readers (configured_max_in_progress).
- Fail closed when the key is set: the "none" sentinel is gone (an empty
list already claims nothing), and an assignee that is not a valid
profile id is never claimable instead of being lower-cased into the
allowlist.
- Trim the regression file to two invariants (allowlist without `default`
buckets the card as nonspawnable AND turns has_spawnable_ready off;
unset key keeps upstream behaviour). Both drive the real dispatch tick
against a real config.yaml + kanban.db; the first is red on origin/main.
- Docs: move the "Shared boards across homes" section out of the
gateway-dispatcher paragraph, state that `default` collides by
construction, add the config-reference row.
923960fa4b