Fixes NousResearch#9980

Root cause: _send_raw_message hardcoded 'chat_id' as receive_id_type,
causing [230001] invalid receive_id errors when sending to user open_ids
(prefix 'ou_') or union_ids (prefix 'on_').
Fix: Add _detect_receive_id_type() that checks ID prefix (oc_→chat_id,
ou_→open_id, on_→union_id) and use it in _send_raw_message.

Fixes NousResearch#9950

Root cause: Prompts discarded for having no reasoning were not added to
completed_in_batch, causing --resume to retry them indefinitely.
Fix: Append prompt_index to completed_in_batch before continuing past
the discard branch.

… env var

Fixes NousResearch#9869

Root cause: Hindsight cloud client had hardcoded 30s timeout, causing
hindsight_reflect to fail for longer operations.
Fix: Read timeout from HINDSIGHT_TIMEOUT env var with default of 300s.

…t cwd

Fixes NousResearch#9949

Root cause: Relative paths in skills.external_dirs were resolved against
the process cwd via Path.resolve(), causing inconsistent behavior across
CLI/gateway/cron contexts.
Fix: Check if the path is relative and resolve it against the config
file's parent directory instead of cwd.

Fixes NousResearch#9948

Root cause: add_provider() set _has_external=True and appended to
_providers BEFORE calling get_tool_schemas(). If schemas raised, the
manager was left in a half-registered state that blocked all future
external providers.
Fix: Call get_tool_schemas() first and only mutate state after it
succeeds.

Fixes NousResearch#10009

Root cause: install.sh used unquoted $PYTHON_PATH in command
substitutions, causing failures on macOS where uv manages Python in
~/Library/Application Support/uv/ (path contains spaces).
Fix: Quote all $PYTHON_PATH usages in check_python().