#143 - Remove all PHPStan ignores at level 6

[njoubert-cleverage]

Description

Refs #143 (step 1 of 3: levels 7-8, then 9-10 will follow in separate PRs, so the issue stays open).

phpstan.neon hid 219 level 6 errors behind 9 ignoreErrors patterns, with reportUnmatchedIgnoredErrors: false masking the ones that no longer matched anything. This PR keeps level 6 and removes every ignore:

• remove all ignoreErrors and reportUnmatchedIgnoredErrors: false from phpstan.neon;
• add the missing iterable value types and generic types in PHPDoc (no native signature change): options and contexts as array<string, mixed> (TransformerInterface::transform() and all its implementations, ProcessState, ProcessManager, events, logger processors…), task codes as list<string> in ProcessConfiguration / TaskConfiguration, \SplQueue<…>, Options<array<string, mixed>>, array<string, \Closure> for normalized transformers, CSV headers and lines;
• remove the 2 @phpstan-ignore-next-line: the one in ProcessLauncherTask was no longer needed, the one in AbstractIterableOutputTask hid an unreachable check ($iterator is a ?\Iterator, it is always null at this point);
• InputAggregatorTask: remove the always-false !$previousState->getTaskConfiguration() check (non-nullable return type);
• fix InputIteratorTask: an \IteratorAggregate input whose getIterator() does not return an \Iterator (e.g. another \IteratorAggregate) failed with a TypeError; it is now wrapped in an \IteratorIterator. Add InputIteratorTaskTest, precise the reference documentation.

On main, only the nested IteratorAggregate test fails (TypeError). PHPStan (level 6, no ignore), PHPUnit (255 tests), PHP-CS-Fixer and Rector pass.

Requirements

• Documentation updates
  • Reference
  • Cookbooks
  • Changelog
• Unit tests

Breaking changes

None: only PHPDoc is added, native signatures are unchanged. Projects analysing their own code extending these classes with PHPStan may get more precise types.

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