feat(faucet): fail closed for underfunded assets

[BrewCodeDev]

Outcome

Adds fail-closed, balance-aware availability for Makalu faucet assets and establishes the living tracker for all seven Makalu extra-work streams.

Included

• Per-asset available, claimableAmounts, minimumClaimAmount, and shortfall health metadata
• Pre-transfer funding gate that rejects underfunded or unreadable assets before cooldown mutation
• Explorer-compatible degraded health response
• Seven focused service/route tests
• Evidence-backed sequential tracker at docs/makalu-extra-works-handoff.md

Verification

• pnpm --dir faucet test — 7 passed
• pnpm --dir faucet build — passed
• Clean install used the committed Makalu/pnpm-lock.yaml

Remaining operational gates

This PR does not fund or deploy the faucet. After merge, the deploy/treasury owners must deploy the release, replenish all ten LEP-100 assets above their approved reserves, record one live claim per asset, and confirm low-balance alert routing and replenishment ownership.

[github-actions]

Test Results

Package	Passed	Failed	Skipped	Total	Duration
api	no results
indexer	no results
explorer	no results

Coverage

Package	Stmts %	Branch %	Funcs %	Lines %
api	no coverage
indexer	no coverage
explorer	no coverage

_{Generated by ci.yaml for 4e16f3e246f12d9343a245d67cfa85c169e394db. Test JSON + coverage HTML are uploaded as run artifacts.}