harden: freeze PYTH_SOLANA_FEEDS and all SLAB_TIERS_* exports

[0x-SquidSol]

Summary

• Exported config objects (PYTH_SOLANA_FEEDS, SLAB_TIERS_V1M, SLAB_TIERS_V1M2, SLAB_TIERS_V_ADL, SLAB_TIERS_V_SETDEXPOOL, SLAB_TIERS_V12_1) were plain mutable Records
• A compromised dependency could mutate them to poison oracle feeds or corrupt layout detection
• Deep-freezes each object and its inner entries after population loops complete
• Follows the precedent of IX_TAG (PR fix(abi): remove redundant IX_TAG mutations, freeze object #135) and PROGRAM_IDS (PR harden: deep-freeze PROGRAM_IDS, STAKE_PROGRAM_IDS, and STAKE_IX #189)

Test plan

• No new test failures (729 passed, same 16 pre-existing)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7f3a5f55-3ac4-4bb9-b3d0-715b24c48bb1

📥 Commits

Reviewing files that changed from the base of the PR and between 2f80d79 and c8c53e9.

📒 Files selected for processing (2)

• src/oracle/price-router.ts
• src/solana/slab.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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