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c1a70d84d0
Let definitions compute values without Python. A new `call: expression`
action evaluates a Common Expression Language (CEL) expression, and tool
`with:` blocks now render `${...}` CEL templates.
Example 1:
```yaml
decide:
do:
call: expression
expr: "state.score >= 80 ? 'qualified' : 'nurture'"
router: true
emit: [qualified, nurture]
```
Example 2:
```yaml
search:
do:
call: tool
ref: my.pkg:SearchTool
with:
search_query: "${outputs.build_query.query + ' news'}"
max_results: "${state.limit}"
```