fix(solid_generator): doc-comment .value rewrite + effect materialization lint (dev.9)

[nank1ro]

Two generator quirks surfaced while building an app on dev.8.

Quirk A — doc-comment references get .value

A documentation-comment reference to a reactive field (/// … [count] …) was rewritten to [count.value] — an invalid reference that trips comment_references. _ValueRewriteVisitor now skips Comment subtrees (comment references resolve as declarations, not runtime reads), so the doc comment survives untouched while the member body still gets its .value append.

Quirk B — @SolidEffect trips unnecessary_statements

@SolidEffect lowered to late final <name> = Effect(...) plus a bare <name>; "touch" statement (in the synthesized constructor / initState) to force the lazy initializer. That bare statement trips unnecessary_statements in the generated output. It now lowers to a declared late final Effect <name>; field plus an assignment <name> = Effect(...) at the materialization site — lint-clean, and the canonical flutter_solidart idiom. The field stays late final because the closure reads sibling instance fields (a non-late initializer can't). Behaviour is unchanged: same closure, same materialization timing, same reverse-dispose order.

Tests

• New goldens: doc_comment_reference_preserved, two_effects_ordering (locks multi-effect declaration + assignment ordering).
• 15 effect goldens regenerated to the declare+assign shape.
• Full suite 368/368 green (incl. idempotency), dart analyze lib clean.

Reviewed by 2 adversarial reviewers (0 bugs). Bumps solid_generator to 3.0.0-dev.9.