Stateful flows (#1931)

* fix: ensure persisted state overrides class defaults

- Remove early return in Flow.__init__ to allow proper state initialization
- Add test_flow_default_override.py to verify state override behavior
- Fix issue where default values weren't being overridden by persisted state

Fixes the issue where persisted state values weren't properly overriding
class defaults when restarting a flow with a previously saved state ID.

Co-Authored-By: Joe Moura <[email protected]>

* test: improve state restoration verification with has_set_count flag

Co-Authored-By: Joe Moura <[email protected]>

* test: add has_set_count field to PoemState

Co-Authored-By: Joe Moura <[email protected]>

* refactoring test

* fix: ensure persisted state overrides class defaults

- Remove early return in Flow.__init__ to allow proper state initialization
- Add test_flow_default_override.py to verify state override behavior
- Fix issue where default values weren't being overridden by persisted state

Fixes the issue where persisted state values weren't properly overriding
class defaults when restarting a flow with a previously saved state ID.

Co-Authored-By: Joe Moura <[email protected]>

* test: improve state restoration verification with has_set_count flag

Co-Authored-By: Joe Moura <[email protected]>

* test: add has_set_count field to PoemState

Co-Authored-By: Joe Moura <[email protected]>

* refactoring test

* Fixing flow state

* fixing peristed stateful flows

* linter

* type fix

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Joe Moura <[email protected]>

improving guardrails

curting new verson

Merge pull request #1698 from crewAIInc/brandon/cre-510-update-docs-t…

…o-talk-about-pydantic-and-json-outputs

Talk about getting structured consistent outputs with tasks.

preparing new version

Merge pull request #1597 from crewAIInc/tm-fix-crew-train-test

Fix crew_train_success test

preparing new version

updating LLM docs

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new version