feat: add eloq_store_root_meta_cache_size to eloq_store_config

[eatbreads]

Here are some reminders before you submit the pull request

• Add tests for the change
• Document changes
• Reference the link of issue using fixes eloqdb/tx_service#issue_id
• Reference the link of RFC if exists
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Summary by CodeRabbit

• New Features

  • Added a configurable global RootMeta cache size for EloqStore (default 1GB). If left at default, the system can auto-size the cache based on node memory to optimize performance.
  • Cache allocation is now accounted for in overall node memory calculations.

• Chores

  • Updated internal submodule pointer with no user-facing behavioral changes.

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[coderabbitai]

Walkthrough

Adds a global EloqStore root-meta cache-size flag and config fallback/auto-derivation, parses and assigns it to eloqstore configs, subtracts it from node memory accounting before other sizing, and updates the eloqstore submodule pointer.

Changes

Cohort / File(s)	Summary
Configuration: root-meta cache store_handler/eloq_data_store_service/eloq_store_config.cpp	Added DEFINE_string(eloq_store_root_meta_cache_size, "1GB", ...); compute root_meta_cache_size from flag, config file, or auto-derived (node_memory_mb / 20 with "MB" suffix); parse via parse_size, assign to eloqstore_configs_.root_meta_cache_size, log auto-selection when used, and subtract from node_memory_mb prior to other sizing (e.g., manifest_limit).
Submodule pointer store_handler/eloq_data_store_service/eloqstore	Updated submodule commit pointer (bumped to a newer commit). No in-diff code behavior changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• update eloqstore subm #371: Updates the eloqstore submodule pointer in the same path; related at the submodule level.
• chore: update submodule eloqstore and add new parameters to eloq_store_config #370: Similar changes to eloq_store_config.cpp (flags and eloqstore_configs_ initialization), overlapping code-level area.

Suggested reviewers

• thweetkomputer
• MrGuin

Poem

🐇 I nibble flags and count the RAM,
I tuck root-meta into a tidy dam.
From config, flag, or memory's share,
I stash the cache with gentle care.
A submodule hop — the code feels light.

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The PR description is a checklist template with no substantive content describing the actual changes or their rationale.	Replace the template with a meaningful description explaining why the cache size configuration was added, what problem it solves, and details about the eloqstore dependency bump.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding eloq_store_root_meta_cache_size configuration flag to eloq_store_config, which is the primary code addition shown in the changeset.

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✨ Finishing touches

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• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@store_handler/eloq_data_store_service/eloqstore`:
- Line 1: Update the size-validation and parsing to explicitly reject zero and
absurdly large values and add tests: modify is_valid_size() and parse_size() in
eloq_store_config.cpp to ensure parsed numeric value > 0 and <= a defined
MAX_ROOT_META_CACHE_BYTES (choose a sensible cap or compare to system total
memory via a helper like getTotalSystemMemory()), and ensure unit parsing only
accepts supported units (e.g., B, KB, MB, GB, TB) so unknown units like "PB" are
rejected; then add unit/edge-case tests in eloqstore_config_test (and an
integration test that sets eloq_store_root_meta_cache_size and verifies
EloqStore uses the parsed value) to cover valid cases ("1GB","512MB","2TB") and
invalid cases ("0GB","-1GB","1PB","abc","").