Clarify mapping keys and remove stale comments

[KillariDev]

Document the meaning and order of unnamed Solidity mapping keys and values, including ERC-1155 balances and approvals, share migration accounting, escrow outcomes, approval nonces, factory deployment IDs, and auction/carry-tree indexes. Distinguish one-based Fenwick indexes from zero-based MMR leaf indexes and specify accounting units where needed.

Remove stale or redundant procedural comments and a commented-out escalation migration call. Clarify underfunded auction estimates, attoETH units, and the rationale for broad live-network price-test bounds.

All source and test edits are comments only. Refresh the comment-sensitive documentation audit fingerprints and regenerate the reference pages' hidden fingerprint comments. Executable behavior, assertions, compiled ABIs, storage declarations, license headers, compiler directives, and rendered documentation are unchanged.

Validation:

• bun run tsc
• bun ./tooling/testing/bun-test.mts tooling/docs/contract-reference-metadata.test.ts (5 tests)
• bun run format:check
• bun run check
• bun run knip
• bun run check:generated-clean
• Direct diff inspection confirming comment-only source/test edits and hidden-comment-only generated HTML edits
• git diff --check

Protocol, application, and browser tests are skipped because executable behavior, assertions, and interfaces are unchanged. Browser QA and visual review are skipped because no rendered appearance or interaction changes. The affected metadata tests and documentation freshness check cover the audit-pin updates; documentation review covers the generated HTML comments.