`def h(source, /, **kwargs)` and `def h(*session_id, **kwargs)` cannot take
that name by keyword, so the context value belongs in kwargs. (Greptile
re-review on #140997.)
A handler like `def h(source, **kwargs)` got raw_args positionally AND source=
from the context (TypeError). Drop the first positional parameter name from
the context before both the **kwargs and the named-parameter branches.
(Greptile review on #140997.)
Widen the contributor's opt-in `source=` to the calling-session context plugins
asked for (#140199, #91526, #123245): a `ctx.register_command` handler that
declares any of `session_id`, `session_key`, `platform`, `source` (or
`**kwargs`) receives them; one-argument handlers keep `handler(raw_args)`.
- One call boundary (hermes_cli/plugin_command_dispatch.py) used by the gateway
(messaging platforms and local CLI/Desktop sessions via
`_hm_run_plugin_handler`), the TUI/Desktop RPC (`_run_plugin_command`) and
the classic CLI's off-gateway fallback. The first positional parameter
always gets raw_args whatever its name.
- Messaging plugin commands look up the chat's current session entry (never
create one), so HERMES_SESSION_ID / `session_id` are the id a later /new
reports as old_session_id instead of "" (#123245).
- Fold the contributor's separate gateway adapter module back into
`_hm_run_plugin_handler` so the local-session path shares it.
- Tests trimmed to two invariants, both red on origin/main.
Teknium