Align allowance admission with liquidation threshold

[KillariDev]

Summary

• require new security-bond allowances to satisfy the same multiplier-adjusted boundary used by liquidation
• align the UI Max calculation, atomic rounding, documentation, generated contract reference, and deterministic mainnet addresses
• add contract and UI regressions for equality, unsafe admission, aggregate backing, rounding, and accessibility

Boundary semantics

Allowance admission now requires:

repBacking * PRICE_PRECISION >= allowance * securityMultiplier * repEthPrice

Liquidation keeps the strict inverse > comparison, so equality is admissible and non-liquidatable. Later REP withdrawals and escalation deposits intentionally retain their face-value coverage checks.

Validation

• final full suite: 2,343 passed, 16 documented network-dependent skips, 0 failed
• bun run tsc
• bun run format:check
• bun run check
• bun run docs:check
• bun run knip
• bun run check:generated-clean
• git diff --check

Final independent review: 93/100, no findings. Final visual review: 89/100, no findings.

Visual evidence

Documentation was checked at 1440x900 and 390x844. The UI change preserves the existing visible Max control and changes its calculated value plus accessible name only. A live UI screenshot could not be attached because the collaborative preview required authentication and the fallback simulation capture hung; focused DOM tests and production Chromium scenarios passed.