## Why

A single unquoted word passed to `kb` (e.g., `kb infow`) is silently treated as a note and ingested. This is almost always a mistyped command, not an intentional note. Users lose trust when typos pollute their knowledge base.

## What Changes

- The implicit note shorthand will require **more than one argument** to be treated as a note. A single bare word will be rejected with a helpful error suggesting the user check their command or quote a multi-word note.
- This is a **BREAKING** change to the implicit note shorthand: `kb singleword` no longer creates a note. Users must write `kb "singleword is important"` or use multiple words.

## Capabilities

### New Capabilities

_(none)_

### Modified Capabilities

- `go-client`: The "Implicit note shorthand" requirement changes to reject single-word bare arguments and print an error instead of submitting them as notes.

## Impact

- **Code**: `client/cmd/root.go` — `RunE` handler for the root command
- **Tests**: `client/cmd/root_test.go` or equivalent — add/update tests for single-word rejection
- **Users**: Anyone who intentionally used `kb singleword` as a note shorthand will need to use multiple words or quotes