fix(slab): export V12.1 SBF tier sizes for mainnet discovery

[0x-SquidSol]

Summary

• SLAB_TIERS_V12_1 computes sizes using HOST/aarch64 constants (engineOff=648, accountSize=320) but mainnet deploys the SBF binary (engineOff=616, accountSize=280)
• Size difference is ~14% per tier: medium is 331,544 (HOST) vs 290,120 (SBF), large is 1,321,112 vs 1,156,808
• SLAB_TIERS (the mainnet default) aliased to HOST sizes — discoverMarkets getProgramAccounts dataSize filters would find zero V12.1 slabs on mainnet
• Fix: Added SLAB_TIERS_V12_1_SBF export computed from SBF constants. Changed SLAB_TIERS to alias SBF sizes. Added both HOST and SBF V12.1 to ALL_TIERS for discovery of slabs from any build target.
• SLAB_TIERS_V12_1 (HOST) preserved unchanged for test builds and backward compatibility

Test plan

• Discovery tests pass (60/60) — tier count updated
• No new test failures introduced (16 pre-existing failures from HOST bitmapOff + ADL mock issues are separate)
• Verify SBF tier sizes match deployed mainnet slabs
• Verify discoverMarkets finds V12.1 SBF slabs via dataSize filter

🤖 Generated with Claude Code

Summary by CodeRabbit

• Improvements
  • Updated slab tier configurations to reflect new mainnet SBF layout specifications
  • Enhanced market discovery by extending tier coverage to include both SBF and test slab layouts
  • Refined slab size calculations for improved accuracy in market creation and discovery processes

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f164baf-61aa-4548-95b2-3bd5952a4653

📥 Commits

Reviewing files that changed from the base of the PR and between 2f80d79 and fcf6710.

📒 Files selected for processing (3)

• src/solana/discovery.ts
• src/solana/slab.ts
• test/discovery.test.ts

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📝 Walkthrough

Walkthrough

This PR introduces SBF-specific slab tier constants with different layout offsets and updates the discovery module to use these new SBF values as the default while maintaining support for HOST/test builds in tier coverage.

Changes

Cohort / File(s)	Summary
SBF Slab Tiers Addition src/solana/slab.ts	Added new exported SLAB_TIERS_V12_1_SBF lookup table with SBF-specific layout constants (ENGINE_OFF=616, BITMAP_OFF=584, ACCOUNT_SIZE=280) and custom size computation logic for Micro/Small/Medium/Large tiers.
Discovery Tier Updates src/solana/discovery.ts	Updated SLAB_TIERS export to source micro/small/medium/large sizes from SLAB_TIERS_V12_1_SBF instead of SLAB_TIERS_V12_1, and extended ALL_TIERS to include both SBF and HOST/test layout variants.
Test Assertion Updates test/discovery.test.ts	Added SLAB_TIERS_V12_1 import and updated tier-count assertion to include SLAB_TIERS_V12_1.length in expected coverage calculation.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• fix(slab): PERC-8469 — correct all V1M2 engine offsets from BPF offset table #125: Directly modifies slab layout/offset constants and slab-size computations in src/solana/slab.ts alongside this PR's SBF-specific tier definitions.
• fix: add mainnet medium tier slab size (257,512) — unblocks market discovery #29: Both PRs adjust slab-tier definitions used by market discovery and mainnet SBF layout parameters.
• fix(slab): add V2 layout for BPF intermediate slabs (65088/1025568 bytes) #15: Both PRs add new slab-tier constants and update discovery module to recognize additional slab layout variants.

Poem

🐰 Hop, hop—new tiers bloom bright,
SBF layouts now take flight!
Micro to Large, all aligned,
Discovery's dual-path redesigned! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: exporting V12.1 SBF tier sizes for mainnet discovery, which is the primary purpose of adding SLAB_TIERS_V12_1_SBF and updating SLAB_TIERS.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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