[Meta] Strict mode, deprecations, lifetime

[Mr3zee]

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Strict mode Migration
A series of changes to simplify kRPC protocol

• Remove fields support
• Remove stream scopes
• Simplify lifetime management
• Cold RPC clients creation
• Deprecated declarations cleanup
• Documentation update for previous changes

[Mr3zee]

Tests pass on CI

[Copilot]

Pull Request Overview

This PR simplifies the kRPC protocol by removing deprecated features and streamlining strict mode checks and lifetime management. Key changes include removal of fields support and deprecated strict mode components, refactoring of diagnostics, and elimination of outdated CLI options.

Reviewed Changes

Copilot reviewed 271 out of 271 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/checkers/FirRpcCheckersVS.kt	Updated strict mode checkers by removing the obsolete context parameter.
compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/FirRpcSupertypeGenerator.kt	Removed the deprecated supertype generator.
compiler-plugin/compiler-plugin-k2/src/main/latest/kotlinx/rpc/codegen/checkers/diagnostics/DiagnosticFactories.kt	Adjusted diagnostics mapping for updated strict mode messages.
compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/checkers/FirRpcStrictModeClassChecker.kt	Updated strict mode checker calls to align with the new API.
compiler-plugin/compiler-plugin-cli/src/main/latest/kotlinx/rpc/codegen/RpcCompilerPlugin.kt	Removed CLI options related to strict mode configuration.
compiler-plugin/compiler-plugin-backend/src/main/core/kotlinx/rpc/codegen/extension/ServiceDeclaration.kt	Removed fields support from service declarations.
compiler-plugin/compiler-plugin-backend/src/main/core/kotlinx/rpc/codegen/extension/RpcIrContext.kt	Removed unused IR properties no longer needed after the deprecations.
compiler-plugin/compiler-plugin-backend/src/main/core/kotlinx/rpc/codegen/extension/RpcDeclarationScanner.kt	Replaced field handling with a runtime error due to removal of fields support.

Comments suppressed due to low confidence (3)

compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/checkers/FirRpcCheckersVS.kt:68

• The removal of the 'ctx' parameter in the strict mode class checker is a significant API change; please verify that all diagnostics and related functionality operate correctly without it.

class FirRpcStrictModeClassCheckerVS : FirRegularClassChecker(MppCheckerKind.Common) {

compiler-plugin/compiler-plugin-k2/src/main/pre_2_0_10/kotlinx/rpc/codegen/FirRpcSupertypeGenerator.kt:1

• The deprecated FirRpcSupertypeGenerator has been completely removed; ensure that any remaining references to this generator in project configurations or documentation are updated accordingly.

File removed

compiler-plugin/compiler-plugin-backend/src/main/core/kotlinx/rpc/codegen/extension/RpcDeclarationScanner.kt:49

• [nitpick] Since support for fields has been removed from @rpc services, consider if a compile-time check might be preferable over throwing a runtime error to enhance the developer experience.

error("Fields are not supported in @Rpc services, this error should be caught by frontend. Please report this issue to the kotlinx-rpc maintainers.")