Add error accumulation methods to the Environment class:
- #errors field to accumulate CompilerErrors across passes
- recordError() to record a single diagnostic (throws if Invariant)
- recordErrors() to record all diagnostics from a CompilerError
- hasErrors() to check if any errors have been recorded
- aggregateErrors() to retrieve the accumulated CompilerError
- tryRecord() to wrap callbacks and catch CompilerErrors

…erance

- Change runWithEnvironment/run/compileFn to return Result<CodegenFunction, CompilerError>
- Wrap all pipeline passes in env.tryRecord() to catch and record CompilerErrors
- Record inference pass errors via env.recordErrors() instead of throwing
- Handle codegen Result explicitly, returning Err on failure
- Add final error check: return Err(env.aggregateErrors()) if any errors accumulated
- Update tryCompileFunction and retryCompileFunction in Program.ts to handle Result
- Keep lint-only passes using env.logErrors() (non-blocking)
- Update 52 test fixture expectations that now report additional errors

This is the core integration that enables fault tolerance: errors are caught,
recorded, and the pipeline continues to discover more errors.

…rs on env

Update 9 validation passes to record errors directly on fn.env instead of
returning Result<void, CompilerError>:
- validateHooksUsage
- validateNoCapitalizedCalls (also changed throwInvalidReact to recordError)
- validateUseMemo
- dropManualMemoization
- validateNoRefAccessInRender
- validateNoSetStateInRender
- validateNoImpureFunctionsInRender
- validateNoFreezingKnownMutableFunctions
- validateExhaustiveDependencies

Each pass now calls fn.env.recordErrors() instead of returning errors.asResult().
Pipeline.ts call sites updated to remove tryRecord() wrappers and .unwrap().

… tolerance

Update remaining validation passes to record errors on env:
- validateMemoizedEffectDependencies
- validatePreservedManualMemoization
- validateSourceLocations (added env parameter)
- validateContextVariableLValues (changed throwTodo to recordError)
- validateLocalsNotReassignedAfterRender (changed throw to recordError)
- validateNoDerivedComputationsInEffects (changed throw to recordError)

Update inference passes:
- inferMutationAliasingEffects: return void, errors on env
- inferMutationAliasingRanges: return Array<AliasingEffect> directly, errors on env

Update codegen:
- codegenFunction: return CodegenFunction directly, errors on env
- codegenReactiveFunction: same pattern

Update Pipeline.ts to call all passes directly without tryRecord/unwrap.
Also update AnalyseFunctions.ts which called inferMutationAliasingRanges.

Add test fixture demonstrating fault tolerance: the compiler now reports
both a mutation error and a ref access error in the same function, where
previously only one would be reported before bailing out.

Update plan doc to mark all phases as complete.