send_message(target="whatsapp:<group-jid>") silently delivered to the
configured home DM instead of the requested group. Two gaps:
1. _parse_target_ref had no WhatsApp branch. Group JIDs (<id>@g.us),
user JIDs (<id>@s.whatsapp.net), linked-identity JIDs (<id>@lid), and
broadcast/newsletter JIDs matched no pattern and fell through to
`return None, None, False`, so the caller treated them as
unresolvable and used the home channel. The bridge's /send endpoint
accepts any chatId, so only the tool-side target parsing was at fault.
Add a whatsapp branch that recognizes native JIDs as explicit targets.
The pre-existing '+'-prefixed E.164 path is preserved.
2. WhatsApp groups have no human-friendly name — the channel directory
is regenerated from session data on a timer, so a group shows up as
its raw 18-digit JID and any hand-edit to channel_directory.json is
clobbered on the next rebuild. Add a user-maintained alias overlay
(~/.hermes/channel_aliases.json) re-applied on every build AND every
load, giving durable friendly names and letting a freshly-created
group be pre-named before its first message.
Tests: TestParseTargetRefWhatsAppJID (7 cases) for the parser;
TestChannelAliases (7 cases) for the overlay, plus an autouse fixture
isolating CHANNEL_ALIASES_PATH so a real alias file can't leak into the
existing directory tests.
ea49a79633