docs(backlog): fix stale error() level wording in backlog index

[FullGas1]

Summary

• The .backlog/README.md index entry for FIX-CONFIG-NOT-LOADED-GUARD still described the guard as using error(msg, 3). That was the initial implementation, but review remediation on PR fix(config): refuse getSetting() before ctld.initialize(), clearly #141 changed it to error(msg, 0) (message-only) because a fixed stack level breaks for real tail-call call sites in Lua 5.1.
• Doc-only fix: one wording correction in the index line, no code change.

Test plan

• Doc-only change, no tests affected.

Summary by Sourcery

Documentation:

• Correct the backlog index wording to accurately describe the merged configuration-not-loaded guard behavior.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the backlog index documentation for FIX-CONFIG-NOT-LOADED-GUARD to match the merged implementation, changing the stale error(msg, 3) wording to error(msg, 0) and noting the Lua 5.1 tail-call rationale; no production code or tests are affected.

File-Level Changes

Change	Details	Files
Correct the backlog index to document the guard’s current message-only error behavior and explain why a fixed stack level is not used.	Replace error(msg, 3) with error(msg, 0). Clarify that fixed stack levels fail for real tail-call sites in Lua 5.1.	.backlog/README.md

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