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1cb935997c
* fix: fail loudly on an unknown workflow expression filter
The expression evaluator's filter dispatch fell through to `return value`
for any unregistered filter, so a typo'd or unsupported filter such as
`{{ items | length }}` rendered the value unchanged with no error and the
run completed — a silent wrong result.
Raise a clear ValueError instead, naming the offending filter and the valid
ones, mirroring the strict handling already used for `from_json`. The five
registered filters (default/join/map/contains/from_json) are unchanged; the
`name(arg)` form of an unknown filter is now caught too.
* fix: distinguish a misused registered filter from an unknown one; cover map
Address the review feedback on the unknown-filter fail-loud path:
- A *registered* filter used in an unsupported form (e.g. `| join` or
`| map` with no argument) raised the misleading "unknown filter
'<name>'" — the filter is registered, the syntax isn't. It now raises
a message naming it as a known filter misused. A new
`_REGISTERED_FILTERS` constant drives the distinction.
- `test_registered_filters_unaffected` now also exercises `map('attr')`,
which it previously claimed to cover but didn't. Add
`test_registered_filter_unsupported_form_raises` to pin the new path.
* fix: include the no-arg default form in the filter-error hint
Copilot review: the hint listed default('x') but omitted the valid
no-argument default form (| default), which this module supports.