Harden publishing

[marta-lokhova]

This PR contains two changes:

• Properly fsync HAS files that act as a "publish queue". Note that the checkpoints themselves are using XDR streams with fsync turned on already, so this change impacts HAS files only.
• Gracefully handle situations where nodes enable publish mid-checkpoint. Core will wait until the next checkpoint to begin publishing. Without this change, nodes would need to rebuild state before enabling publishing (although it's unclear how often partial archives occur in practice).

Additionally, I added a few more thing to aid debugging, such as printing checkpoint files with dump-xdr and an offline command to dump all checkpoints scheduled to publish.

[SirTyson]

LGTM after the MODE_DISABLES_FSYNC change.

[Copilot]

Pull request overview

This PR hardens the publishing mechanism by ensuring proper fsync of checkpoint files and gracefully handling situations where publishing is enabled mid-checkpoint. The key changes include:

• Switching HAS checkpoint files from JSON to binary format with proper fsync support
• Adding logic to wait for the next checkpoint boundary when publishing is enabled mid-checkpoint
• Adding debugging tools to inspect checkpoint files and the publish queue

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/util/XDRStream.h	Added documentation about durable write requirements and updated comments for clarity
src/util/BufferedAsioCerealOutputArchive.h	Added <cereal/types/string.hpp> include to support string serialization
src/main/dumpxdr.cpp	Updated regex to support .dirty suffix for checkpoint files
src/main/CommandLine.cpp	Added print-publish-queue command and necessary cereal vector include
src/history/HistoryManagerImpl.cpp	Changed checkpoint file format from JSON to binary with fsync, updated file extensions from .json to .checkpoint, and added loadCheckpointHAS helper
src/history/CheckpointBuilder.h	Added mPublishWasDisabled flag and changed ensureOpen return type to bool
src/history/CheckpointBuilder.cpp	Implemented logic to detect and handle mid-checkpoint publishing enablement, with proper checkpoint boundary detection

[Copilot]

Typo in comment: "intent" should be "intend".

Suggested change

	2. Write to a temp file first. If you don't intent to persist temp files across
	2. Write to a temp file first. If you don't intend to persist temp files across

[Copilot]

The comment still references "checkpoint JSON" but the file format has been changed to binary. The comment should be updated to reflect this change.