chore: Allow JustReply() in cmd-support

[dranikpg]

In case something needs to return neither an error nor perform an action - like return an array of null values, etc

[Copilot]

Pull request overview

This PR introduces the ability for async command contexts to return immediately without executing any transaction, addressing the need for commands that need to return neither an error nor perform an action (like returning an array of null values). The key addition is the JustReplySentinel type that allows commands to signal they want to reply directly without scheduling any operations.

Changes:

• Added JustReplySentinel struct to allow commands to signal immediate reply without execution
• Updated AsyncContextInterface::PrepareResult to include JustReplySentinel as a third variant option
• Modified RunSync and RunAsync to handle the new JustReplySentinel case
• Replaced usage of SendNotFound() helper method with direct MCRender calls for better consistency
• Removed SendNotFound() helper from ParsedCommand class

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/server/cmd_support.h	Added JustReplySentinel struct and JustReply() helper method; updated PrepareResult variant to include the new sentinel type
src/server/cmd_support.cc	Updated RunSync and RunAsync to handle JustReplySentinel case, allowing immediate replies without blocking
src/server/string_family.cc	Replaced SendNotFound() call with direct MCRender::RenderNotFound() usage
src/facade/parsed_command.h	Removed SendNotFound() helper method

[augmentcode]

🤖 Augment PR Summary

Summary: This PR extends the async command-support API to allow contexts to “just reply” without scheduling any transactional work.

Changes:

• Introduced a new `JustReplySentinel` type and added it to `AsyncContextInterface::PrepareResult`
• Updated `AsyncContextInterface::RunSync` / `RunAsync` to accept the sentinel and reply immediately when no blocker is needed
• Added `SimpleContext::JustReply()` helper for CRTP-based async command contexts
• Removed `ParsedCommand::SendNotFound()` and inlined the memcache “NOT_FOUND/NF” rendering at the single call site

Technical Notes: In deferred-reply mode, the “just reply” path uses ReplyWith() to store a ready-to-send reply function rather than registering an async blocker.

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[augmentcode]

Review completed. 1 suggestions posted.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.