feat(precompiles)!: remove IBC and Oracle precompiles

[alexander-sei]

Closes PLT-977.

Supersedes #324 (auto-closed when its base branch was deleted after #323 merged; could not reopen after rebase). Rebased onto main.

Why

The IBC and Oracle precompiles are no longer supported on Sei (see CON-283 and CON-205), but the package still shipped a full public surface for both, pointing integrators at endpoints that will fail. Same shape of change as #279, which removed the confidential transfers precompile.

What

Deletes the six source files (precompiles/, ethers/, viem/ for each) and prunes all three barrels and both spec files. Ten exports are removed:

Entrypoint	IBC	Oracle
precompiles/	IBC_PRECOMPILE_ADDRESS, IBC_PRECOMPILE_ABI	ORACLE_PRECOMPILE_ADDRESS, ORACLE_PRECOMPILE_ABI
ethers/	ETHERS_IBC_PRECOMPILE_ABI, getIbcPrecompileEthersV6Contract	ETHERS_ORACLE_PRECOMPILE_ABI, getOraclePrecompileEthersV6Contract
viem/	VIEM_IBC_PRECOMPILE_ABI	VIEM_ORACLE_PRECOMPILE_ABI

Versioning

This removes ten public exports, so it ships as a major (3.0.0). Caret ranges on ^2.x (including this repo's own create-sei templates) will not pick the removal up automatically.

Blast radius

Nothing else in the monorepo referenced these — create-sei's extension and next-template only use the bank precompile, and they pin ^2.1.2. The only remaining ibc/oracle matches in the repo are @sei-js/registry's IBC chain registry, which is unrelated and stays, and the historical changelog.

Verification

• tsc --noEmit clean, 35/35 jest tests pass, biome clean, changeset status resolves @sei-js/precompiles to major.
• The barrel parity test added in fix(precompiles): export solo precompile from ethers entrypoint #323 passes unchanged here: it derives precompile names from each barrel rather than hardcoding a count, so it follows the set down from 12 to 10 and would fail if a barrel got out of sync during the removal.

Made with Cursor

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.83%. Comparing base (b3db3e8) to head (fc1cd69).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   82.16%   81.83%   -0.34%     
==========================================
  Files          76       70       -6     
  Lines        1301     1277      -24     
  Branches      162      223      +61     
==========================================
- Hits         1069     1045      -24     
  Misses        232      232              

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[seidroid]

Clean, self-consistent removal of the IBC and Oracle precompiles across all three barrels and both spec files, with a correct major changeset and no dangling references anywhere in the monorepo. No blockers; one sourcing question on the deprecation claim and a note that the Cursor pass produced no output.

Findings: 0 blocking | 5 non-blocking | 1 posted inline

Blockers

• None at the file/PR level.

Non-blocking

• The Cursor second-opinion file (cursor-review.md) is empty — that review pass produced no output, so this synthesis rests on the Codex pass (no material findings) plus my own read. Codex and I agree the removal is consistent and correctly versioned.
• Verified independently: a repo-wide grep for IBC_PRECOMPILE/ORACLE_PRECOMPILE/getIbcPrecompileEthersV6Contract/getOraclePrecompileEthersV6Contract finds no remaining references outside the new changeset — the only ibc/oracle hits are historical packages/precompiles/CHANGELOG.md entries (correctly left alone) and @sei-js/registry's unrelated IBC chain registry. No README or typedoc config references the deleted files.
• The barrel-parity test (src/__tests__/barrelParity.spec.ts) is unmodified and derives precompile names by regex from each barrel rather than hardcoding a count, so the PR's claim that it follows the set down from 12 to 10 — and would fail if one barrel were pruned but not another — holds. No new test is needed for this removal.
• Changeset handling matches guideline §3: a major bump on @sei-js/precompiles alone is right for dropping ten public exports, and .changeset/config.json (fixed: [], linked: []) means no coordinated bump across the other packages is expected.
• 1 suggestion(s)/nit(s) flagged inline on specific lines.

[seidroid]

[suggestion] Per the repo's convention that precompile addresses/ABIs are hand-maintained source of truth, could you add a public-facing citation for "neither precompile is supported on Sei any more"? The PR body points at CON-283 / CON-205, which downstream integrators reading this changeset can't open. A link to docs.sei.io or the sei-chain commit that removed 0x...1009 (IBC) and 0x...1008 (Oracle) would make the "calls fail on-chain" claim checkable at the point where consumers hit the breaking change. Not blocking — the removal itself is clean and follows the #279 confidential-transfers precedent.